def train_and_evaluate(config: ml_collections.ConfigDict, workdir: str):
"""Runs a training and evaluation loop.
Args:
config: Configuration to use.
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
"""
tf.io.gfile.makedirs(workdir)
vocab_path = config.vocab_path
if vocab_path is None:
vocab_path = os.path.join(workdir, "sentencepiece_model")
config.vocab_path = vocab_path
tf.io.gfile.makedirs(os.path.split(vocab_path)[0])
# Load Dataset
# ---------------------------------------------------------------------------
logging.info("Initializing dataset.")
train_ds, eval_ds, _, encoder = input_pipeline.get_datasets(
n_devices=jax.local_device_count(),
config=config,
vocab_path=vocab_path)
train_iter = iter(train_ds)
vocab_size = int(encoder.vocab_size())
eos_id = temperature_sampler.EOS_ID # Default Sentencepiece EOS token.
def decode_tokens(toks):
valid_toks = toks[:np.argmax(toks == eos_id) + 1].astype(np.int32)
return encoder.detokenize(valid_toks).numpy().decode("utf-8")
def encode_strings(strs, max_len):
tokenized_batch = np.zeros((len(strs), max_len), np.int32)
for i, s in enumerate(strs):
toks = encoder.tokenize(s).numpy()
# Remove EOS token in prompt.
tokenized_batch[i, :toks.shape[0] - 1] = toks[:-1]
return tokenized_batch
tokenized_prompts = encode_strings([config.prompts],
config.max_predict_length)
logging.info("Initializing model, optimizer, and step functions.")
# Build Model and Optimizer
# ---------------------------------------------------------------------------
train_config = models.TransformerConfig(
vocab_size=vocab_size,
output_vocab_size=vocab_size,
logits_via_embedding=config.logits_via_embedding,
dtype=jnp.bfloat16 if config.use_bfloat16 else jnp.float32,
emb_dim=config.emb_dim,
num_heads=config.num_heads,
num_layers=config.num_layers,
qkv_dim=config.qkv_dim,
mlp_dim=config.mlp_dim,
max_len=max(config.max_target_length, config.max_eval_target_length),
dropout_rate=config.dropout_rate,
attention_dropout_rate=config.attention_dropout_rate,
deterministic=False,
decode=False,
kernel_init=nn.initializers.xavier_uniform(),
bias_init=nn.initializers.normal(stddev=1e-6))
eval_config = train_config.replace(deterministic=True)
predict_config = train_config.replace(deterministic=True, decode=True)
start_step = 0
rng = jax.random.PRNGKey(config.seed)
rng, init_rng = jax.random.split(rng)
rng, inference_rng = random.split(rng)
input_shape = (config.per_device_batch_size, config.max_target_length)
m = models.TransformerLM(eval_config)
initial_variables = jax.jit(m.init)(init_rng,
jnp.ones(input_shape, jnp.float32))
# apply an optimizer to this tree
optimizer_def = optim.Adam(config.learning_rate,
beta1=0.9,
beta2=0.98,
eps=1e-9,
weight_decay=config.weight_decay)
optimizer = optimizer_def.create(initial_variables["params"])
# We access model params only from optimizer below via optimizer.target.
del initial_variables
if config.restore_checkpoints:
# Restore unreplicated optimizer + model state from last checkpoint.
optimizer = checkpoints.restore_checkpoint(workdir, optimizer)
# Grab last step.
start_step = int(optimizer.state.step)
writer = metric_writers.create_default_writer(
workdir, just_logging=jax.host_id() > 0)
if start_step == 0:
writer.write_hparams(dict(config))
# Replicate optimizer.
optimizer = jax_utils.replicate(optimizer)
learning_rate_fn = create_learning_rate_scheduler(
base_learning_rate=config.learning_rate,
warmup_steps=config.warmup_steps)
# compile multidevice versions of train/eval/predict step fn.
p_train_step = jax.pmap(functools.partial(
train_step, config=train_config, learning_rate_fn=learning_rate_fn),
axis_name="batch",
donate_argnums=(0, )) # pytype: disable=wrong-arg-types
p_eval_step = jax.pmap(functools.partial(eval_step, config=eval_config),
axis_name="batch")
p_pred_step = jax.pmap(
functools.partial(predict_step,
config=predict_config,
temperature=config.sampling_temperature,
top_k=config.sampling_top_k),
axis_name="batch",
static_broadcasted_argnums=(3,
4)) # eos token, max_length are constant
# Main Train Loop
# ---------------------------------------------------------------------------
# We init the first set of dropout PRNG keys, but update it afterwards inside
# the main pmap"d training update for performance.
dropout_rngs = jax.random.split(rng, jax.local_device_count())
del rng
logging.info("Starting training loop.")
hooks = []
report_progress = periodic_actions.ReportProgress(
num_train_steps=config.num_train_steps, writer=writer)
if jax.host_id() == 0:
hooks += [
report_progress,
periodic_actions.Profile(logdir=workdir, num_profile_steps=5)
]
train_metrics = []
with metric_writers.ensure_flushes(writer):
for step in range(start_step, config.num_train_steps):
is_last_step = step == config.num_train_steps - 1
# Shard data to devices and do a training step.
with jax.profiler.StepTraceContext("train", step_num=step):
batch = common_utils.shard(
jax.tree_map(np.asarray, next(train_iter)))
optimizer, metrics = p_train_step(optimizer,
batch,
dropout_rng=dropout_rngs)
train_metrics.append(metrics)
# Quick indication that training is happening.
logging.log_first_n(logging.INFO, "Finished training step %d.", 5,
step)
for h in hooks:
h(step)
# Periodic metric handling.
if step % config.eval_every_steps == 0 or is_last_step:
with report_progress.timed("training_metrics"):
logging.info("Gathering training metrics.")
train_metrics = common_utils.get_metrics(train_metrics)
lr = train_metrics.pop("learning_rate").mean()
metrics_sums = jax.tree_map(jnp.sum, train_metrics)
denominator = metrics_sums.pop("denominator")
summary = jax.tree_map(lambda x: x / denominator,
metrics_sums) # pylint: disable=cell-var-from-loop
summary["learning_rate"] = lr
summary["perplexity"] = jnp.clip(jnp.exp(summary["loss"]),
a_max=1.0e4)
summary = {"train_" + k: v for k, v in summary.items()}
writer.write_scalars(step, summary)
train_metrics = []
with report_progress.timed("eval"):
eval_results = evaluate(
p_eval_step=p_eval_step,
target=optimizer.target,
eval_ds=eval_ds,
num_eval_steps=config.num_eval_steps)
# (clipped) perplexity after averaging log-perplexitie
eval_results["perplexity"] = jnp.clip(jnp.exp(
eval_results["loss"]),
a_max=1.0e4)
writer.write_scalars(
step,
{"eval_" + k: v
for k, v in eval_results.items()})
with report_progress.timed("generate_text"):
exemplars = generate_prediction(
p_pred_step=p_pred_step,
target=optimizer.target,
tokenized_prompts=tokenized_prompts,
eos_id=eos_id,
inference_rng=inference_rng,
decode_tokens=decode_tokens,
max_predict_length=config.max_predict_length)
writer.write_texts(step, {"samples": exemplars})
# Save a checkpoint on one host after every checkpoint_freq steps.
save_checkpoint = (step % config.checkpoint_every_steps == 0
or is_last_step)
if config.save_checkpoints and save_checkpoint and jax.host_id(
) == 0:
with report_progress.timed("checkpoint"):
checkpoints.save_checkpoint(
workdir, jax_utils.unreplicate(optimizer), step)
def main(argv):
if len(argv) > 1:
raise app.UsageError('Too many command-line arguments.')
tf.enable_v2_behavior()
config = FLAGS.config
logging.info('===========Config Dict============')
logging.info(config)
batch_size = config.batch_size
learning_rate = config.learning_rate
num_train_steps = config.num_train_steps
num_eval_steps = config.num_eval_steps
eval_freq = config.eval_frequency
random_seed = config.random_seed
model_type = config.model_type
max_length = config.max_length
if jax.process_index() == 0:
summary_writer = tensorboard.SummaryWriter(
os.path.join(FLAGS.model_dir, 'summary'))
if batch_size % jax.device_count() > 0:
raise ValueError(
'Batch size must be divisible by the number of devices')
train_ds, eval_ds, test_ds, encoder = input_pipeline.get_matching_datasets(
n_devices=jax.local_device_count(),
task_name=FLAGS.task_name,
data_dir=FLAGS.data_dir,
batch_size=batch_size,
fixed_vocab=None,
max_length=max_length,
tokenizer=config.tokenizer,
vocab_file_path=FLAGS.vocab_file_path)
vocab_size = encoder.vocab_size
logging.info('Vocab Size: %d', vocab_size)
train_ds = train_ds.repeat()
train_iter = iter(train_ds)
input_shape = (batch_size, max_length)
model_kwargs = {
'vocab_size': vocab_size,
'emb_dim': config.emb_dim,
'num_heads': config.num_heads,
'num_layers': config.num_layers,
'qkv_dim': config.qkv_dim,
'mlp_dim': config.mlp_dim,
'max_len': max_length,
'classifier': True,
'num_classes': 2,
'classifier_pool': config.pooling_mode
}
rng = random.PRNGKey(random_seed)
rng = jax.random.fold_in(rng, jax.process_index())
rng, init_rng = random.split(rng)
# We init the first set of dropout PRNG keys, but update it afterwards inside
# the main pmap'd training update for performance.
dropout_rngs = random.split(rng, jax.local_device_count())
model = train_utils.get_model(model_type, create_model, model_kwargs,
init_rng, input_shape)
optimizer = create_optimizer(model,
learning_rate,
weight_decay=FLAGS.config.weight_decay)
del model # Don't keep a copy of the initial model.
start_step = 0
if config.restore_checkpoints or FLAGS.test_only:
# Restore unreplicated optimizer + model state from last checkpoint.
optimizer = checkpoints.restore_checkpoint(FLAGS.model_dir, optimizer)
# Grab last step.
start_step = int(optimizer.state.step)
# Replicate optimizer.
optimizer = jax_utils.replicate(optimizer)
learning_rate_fn = train_utils.create_learning_rate_scheduler(
factors=config.factors,
base_learning_rate=learning_rate,
warmup_steps=config.warmup)
p_train_step = jax.pmap(functools.partial(
train_step, learning_rate_fn=learning_rate_fn),
axis_name='batch')
p_eval_step = jax.pmap(eval_step, axis_name='batch')
# p_pred_step = jax.pmap(predict_step, axis_name='batch')
def run_eval(eval_ds, num_eval_steps=-1):
eval_metrics = []
eval_iter = iter(eval_ds)
if num_eval_steps == -1:
num_iter = itertools.count()
else:
num_iter = range(num_eval_steps)
for _, eval_batch in zip(num_iter, eval_iter):
# pylint: disable=protected-access
eval_batch = common_utils.shard(
jax.tree_map(lambda x: x._numpy(), eval_batch))
# pylint: enable=protected-access
metrics = p_eval_step(optimizer.target, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
eval_metrics_sums = jax.tree_map(jnp.sum, eval_metrics)
eval_denominator = eval_metrics_sums.pop('denominator')
eval_summary = jax.tree_map(
lambda x: x / eval_denominator, # pylint: disable=cell-var-from-loop
eval_metrics_sums)
# Calculate (clipped) perplexity after averaging log-perplexities:
eval_summary['perplexity'] = jnp.clip(jnp.exp(eval_summary['loss']),
a_max=1.0e4)
return eval_summary
if FLAGS.test_only:
with tf.io.gfile.GFile(os.path.join(FLAGS.model_dir, 'results.json'),
'w') as f:
test_summary = run_eval(test_ds)
json.dump(jax.tree_map(lambda x: x.tolist(), test_summary), f)
return
metrics_all = []
tick = time.time()
logging.info('Starting training')
logging.info('====================')
for step, batch in zip(range(start_step, num_train_steps), train_iter):
batch = common_utils.shard(jax.tree_map(lambda x: x._numpy(), batch)) # pylint: disable=protected-access
# logging.info(batch)
optimizer, metrics, dropout_rngs = p_train_step(
optimizer, batch, dropout_rng=dropout_rngs)
metrics_all.append(metrics)
logging.info('train in step: %d', step)
# Save a Checkpoint
if ((step % config.checkpoint_freq == 0 and step > 0)
or step == num_train_steps - 1):
if jax.process_index() == 0 and config.save_checkpoints:
# Save unreplicated optimizer + model state.
checkpoints.save_checkpoint(FLAGS.model_dir,
jax_utils.unreplicate(optimizer),
step)
# Periodic metric handling.
if step % eval_freq == 0 and step > 0:
metrics_all = common_utils.get_metrics(metrics_all)
lr = metrics_all.pop('learning_rate').mean()
metrics_sums = jax.tree_map(jnp.sum, metrics_all)
denominator = metrics_sums.pop('denominator')
summary = jax.tree_map(lambda x: x / denominator, metrics_sums) # pylint: disable=cell-var-from-loop
summary['learning_rate'] = lr
# Calculate (clipped) perplexity after averaging log-perplexities:
summary['perplexity'] = jnp.clip(jnp.exp(summary['loss']),
a_max=1.0e4)
logging.info('train in step: %d, loss: %.4f, acc: %.4f', step,
summary['loss'], summary['accuracy'])
if jax.process_index() == 0:
tock = time.time()
steps_per_sec = eval_freq / (tock - tick)
tick = tock
summary_writer.scalar('steps per second', steps_per_sec, step)
for key, val in summary.items():
summary_writer.scalar(f'train_{key}', val, step)
summary_writer.flush()
# Reset metric accumulation for next evaluation cycle.
metrics_all = []
# Eval Metrics
eval_summary = run_eval(eval_ds, num_eval_steps)
logging.info('eval in step: %d, loss: %.4f, acc: %.4f', step,
eval_summary['loss'], eval_summary['accuracy'])
if jax.process_index() == 0:
for key, val in eval_summary.items():
summary_writer.scalar(f'eval_{key}', val, step)
summary_writer.flush()
# Test eval
# Eval Metrics
logging.info('Testing...')
test_summary = run_eval(test_ds, num_eval_steps)
logging.info('test in step: %d, loss: %.4f, acc: %.4f', step,
test_summary['loss'], test_summary['accuracy'])
if jax.process_index() == 0:
for key, val in test_summary.items():
summary_writer.scalar(f'test_{key}', val, step)
summary_writer.flush()
def main(argv):
if len(argv) > 1:
raise app.UsageError('Too many command-line arguments.')
tf.enable_v2_behavior()
# make sure tf does not allocate gpu memory
tf.config.experimental.set_visible_devices([], 'GPU')
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(FLAGS.model_dir)
rng = random.PRNGKey(0)
image_size = 224
batch_size = FLAGS.batch_size
if batch_size % jax.device_count() > 0:
raise ValueError('Batch size must be divisible by the number of devices')
local_batch_size = batch_size // jax.host_count()
device_batch_size = batch_size // jax.device_count()
platform = jax.local_devices()[0].platform
if FLAGS.half_precision:
if platform == 'tpu':
model_dtype = jnp.bfloat16
input_dtype = tf.bfloat16
else:
model_dtype = jnp.float16
input_dtype = tf.float16
else:
model_dtype = jnp.float32
input_dtype = tf.float32
train_iter = create_input_iter(
local_batch_size, image_size, input_dtype, train=True, cache=FLAGS.cache)
eval_iter = create_input_iter(
local_batch_size, image_size, input_dtype, train=False, cache=FLAGS.cache)
num_epochs = FLAGS.num_epochs
steps_per_epoch = input_pipeline.TRAIN_IMAGES // batch_size
steps_per_eval = input_pipeline.EVAL_IMAGES // batch_size
steps_per_checkpoint = steps_per_epoch * 10
num_steps = steps_per_epoch * num_epochs
base_learning_rate = FLAGS.learning_rate * batch_size / 256.
base_learning_rate = base_learning_rate / FLAGS.loss_scaling
model, model_state = create_model(
rng, device_batch_size, image_size, model_dtype)
optimizer = optim.Momentum(beta=FLAGS.momentum, nesterov=True).create(model)
state = TrainState(step=0, optimizer=optimizer, model_state=model_state)
del model, model_state # do not keep a copy of the initial model
state = restore_checkpoint(state)
step_offset = int(state.step) # step_offset > 0 if restarting from checkpoint
state = jax_utils.replicate(state)
learning_rate_fn = create_learning_rate_fn(
base_learning_rate, steps_per_epoch, num_epochs)
p_train_step = jax.pmap(
functools.partial(train_step, learning_rate_fn=learning_rate_fn),
axis_name='batch')
p_eval_step = jax.pmap(eval_step, axis_name='batch')
epoch_metrics = []
t_loop_start = time.time()
for step, batch in zip(range(step_offset, num_steps), train_iter):
state, metrics = p_train_step(state, batch)
epoch_metrics.append(metrics)
if (step + 1) % steps_per_epoch == 0:
epoch = step // steps_per_epoch
epoch_metrics = common_utils.get_metrics(epoch_metrics)
summary = jax.tree_map(lambda x: x.mean(), epoch_metrics)
logging.info('train epoch: %d, loss: %.4f, accuracy: %.2f',
epoch, summary['loss'], summary['accuracy'] * 100)
steps_per_sec = steps_per_epoch / (time.time() - t_loop_start)
t_loop_start = time.time()
if jax.host_id() == 0:
for key, vals in epoch_metrics.items():
tag = 'train_%s' % key
for i, val in enumerate(vals):
summary_writer.scalar(tag, val, step - len(vals) + i + 1)
summary_writer.scalar('steps per second', steps_per_sec, step)
epoch_metrics = []
eval_metrics = []
# sync batch statistics across replicas
state = sync_batch_stats(state)
for _ in range(steps_per_eval):
eval_batch = next(eval_iter)
metrics = p_eval_step(state, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
summary = jax.tree_map(lambda x: x.mean(), eval_metrics)
logging.info('eval epoch: %d, loss: %.4f, accuracy: %.2f',
epoch, summary['loss'], summary['accuracy'] * 100)
if jax.host_id() == 0:
for key, val in eval_metrics.items():
tag = 'eval_%s' % key
summary_writer.scalar(tag, val.mean(), step)
summary_writer.flush()
if (step + 1) % steps_per_checkpoint == 0 or step + 1 == num_steps:
state = sync_batch_stats(state)
save_checkpoint(state)
# Wait until computations are done before exiting
jax.random.normal(jax.random.PRNGKey(0), ()).block_until_ready()
def main(_):
tf.enable_v2_behavior()
tf.random.set_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
random.seed(FLAGS.seed)
if not gfile.isdir(FLAGS.save_dir):
gfile.mkdir(FLAGS.save_dir)
hparam_str_dict = dict(seed=FLAGS.seed, lr=FLAGS.lr)
# Get hyperparmaters
if FLAGS.xm_parameters:
for key, value in json.loads(FLAGS.xm_parameters).items():
if key not in hparam_str_dict:
hparam_str_dict[key] = value
hparam_str = ','.join([
'%s=%s' % (k, str(hparam_str_dict[k]))
for k in sorted(hparam_str_dict.keys())
])
# Number of local devices for this host.
n_devices = jax.local_device_count()
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(
os.path.join(FLAGS.save_dir, 'tb', hparam_str))
batch_size = FLAGS.per_device_batch_size * n_devices
io_shape = (FLAGS.per_device_batch_size, FLAGS.num_strings_per_task,
FLAGS.max_characters)
program_shape = (FLAGS.per_device_batch_size, FLAGS.max_program_length)
# Setup DSL
# ---------------------------------------------------------------------------
# Build token tables.
id_char_table = {i + 1: char for (i, char) in enumerate(dsl.CHARACTER)}
char_id_table = {char: id for id, char in id_char_table.items()}
id_token_table, token_id_table = dsl_tokens.build_token_tables()
io_vocab_size = len(char_id_table) + 1 # For padding.
program_vocab_size = len(token_id_table) + 1
bos_token = token_id_table[dsl.BOS]
eos_token = token_id_table[dsl.EOS]
def decode_io(inputs, outputs):
"""Decode io examples tokens."""
def decode_str(s):
"""Decode string tokens."""
return ''.join([id_char_table[c_id] for c_id in s if c_id > 0])
io_string = ''
inps, outs = [], []
for inp, out in zip(inputs, outputs):
inps.append(decode_str(inp))
outs.append(decode_str(out))
io_string += inps[-1] + ' < ' + outs[-1] + ' > '
return inps, outs, io_string[:-3] # Remove last separator.
def decode_program(program):
"""Decode program tokens."""
program = program[:np.argmax(program == eos_token) + 1].astype(
np.int32)
try:
p = dsl.decode_program(program, id_token_table)
return p, p.to_string()
except: # pylint: disable=bare-except
return None, '' # Program does not compile.
# Load Dataset
# ---------------------------------------------------------------------------
logging.info('Initializing dataset.')
if not FLAGS.dataset_filepattern:
raise ValueError('Must specify filepattern to dataset.')
# Training dataset.
dataset = input_pipeline.create_dataset_from_tf_record(
FLAGS.dataset_filepattern, token_id_table, char_id_table)
dataset = dataset.padded_batch(batch_size,
padded_shapes=(io_shape[1:], io_shape[1:],
program_shape[1:]),
drop_remainder=True)
# Split evaluation and training.
eval_ds = dataset.take(FLAGS.num_eval_steps)
# Decrease batch of predict dataset to handle beam search.
predict_ds = eval_ds.unbatch().padded_batch(
int(np.ceil(batch_size / 10)),
padded_shapes=(io_shape[1:], io_shape[1:], program_shape[1:]))
train_ds = dataset.skip(FLAGS.num_eval_steps).repeat()
train_iter = train_ds.as_numpy_iterator()
# Build Model and Optimizer
# ---------------------------------------------------------------------------
train_config = models.LatentTransformerConfig(
vocab_size=io_vocab_size,
output_vocab_size=program_vocab_size,
latent_vocab_size=FLAGS.latent_vocab_size,
shift=True,
emb_dim=FLAGS.embedding_dim,
num_heads=FLAGS.num_heads,
num_layers=FLAGS.num_layers,
qkv_dim=FLAGS.embedding_dim,
mlp_dim=FLAGS.hidden_dim,
max_len=max(FLAGS.max_characters, FLAGS.max_program_length),
deterministic=False,
decode=False,
c=FLAGS.c,
train_vq=True,
commitment_cost_vq=FLAGS.commitment_cost_vq,
bos_token=bos_token)
eval_config = train_config.replace(deterministic=True, train_vq=False)
predict_config = train_config.replace(shift=False,
deterministic=True,
train_vq=False,
decode=True)
# Latent Predictor.
lp_train_config = models.TransformerConfig(
vocab_size=io_vocab_size,
output_vocab_size=FLAGS.latent_vocab_size,
shift=True,
emb_dim=FLAGS.embedding_dim,
num_heads=FLAGS.num_heads,
num_layers=FLAGS.num_layers,
qkv_dim=FLAGS.embedding_dim,
mlp_dim=FLAGS.hidden_dim,
max_len=max(FLAGS.max_characters, FLAGS.max_program_length),
deterministic=False,
decode=False,
bos_token=bos_token)
lp_eval_config = lp_train_config.replace(deterministic=True)
lp_predict_config = lp_train_config.replace(shift=False,
deterministic=True,
decode=True)
rng = jax.random.PRNGKey(0)
rng = jax.random.fold_in(rng, jax.host_id())
rng, init_rng = jax.random.split(rng)
m = models.LatentProgramTransformer(eval_config)
initial_variables = jax.jit(m.init)(init_rng,
jnp.ones(io_shape, jnp.float32),
jnp.ones(io_shape, jnp.float32),
jnp.ones(program_shape, jnp.float32))
lp_m = models.ProgramTransformer(lp_eval_config)
lp_initial_variables = jax.jit(lp_m.init)(init_rng,
jnp.ones(io_shape, jnp.float32),
jnp.ones(io_shape, jnp.float32),
jnp.ones(program_shape,
jnp.float32))
optimizer_def = optim.Adam(FLAGS.lr,
beta1=0.9,
beta2=0.98,
eps=1e-9,
weight_decay=FLAGS.weight_decay)
optimizer = optimizer_def.create(initial_variables['params'])
lp_optimizer = optimizer_def.create(lp_initial_variables['params'])
state = TrainState(step=0,
optimizer=optimizer,
model_state=initial_variables['vqvae'],
lp_optimizer=lp_optimizer)
# Don't keep a copy of the initial model.
del initial_variables, lp_initial_variables
train_rngs = jax.random.split(rng, jax.local_device_count())
start_step = 0
if FLAGS.restore_checkpoints:
# Restore unreplicated optimizer + model state from last checkpoint.
state = checkpoints.restore_checkpoint(
os.path.join(FLAGS.save_dir, 'checkpoints', hparam_str), state)
# Grab last step.
start_step = int(state.step)
logging.info('Found model checkpointed at step %d.', start_step)
state = jax_utils.replicate(state)
learning_rate_fn = create_learning_rate_scheduler(
base_learning_rate=FLAGS.lr)
p_train_step = jax.pmap(functools.partial(
train_step,
bos_token=bos_token,
eos_token=eos_token,
learning_rate_fn=learning_rate_fn,
config=train_config,
lp_config=lp_train_config),
axis_name='batch',
static_broadcasted_argnums=(4, ))
p_eval_step = jax.pmap(functools.partial(eval_step,
bos_token=bos_token,
eos_token=eos_token,
config=eval_config,
lp_config=lp_eval_config),
axis_name='batch')
p_init_cache = jax.pmap(functools.partial(
initialize_cache,
max_decode_len=FLAGS.max_program_length,
config=predict_config,
lp_config=lp_predict_config),
axis_name='batch')
p_pred_step = jax.pmap(functools.partial(
predict_step,
bos_token=bos_token,
eos_token=eos_token,
max_decode_len=FLAGS.max_program_length,
config=predict_config,
lp_config=lp_predict_config),
axis_name='batch',
static_broadcasted_argnums=(5, ))
metrics_all = []
latent_metrics_all = []
tick = time.time()
for step in range(start_step, FLAGS.num_train_steps):
inputs, outputs, programs = common_utils.shard(next(train_iter))
state, metrics, latent_metrics, train_rngs = p_train_step(
state,
inputs,
outputs,
programs,
step <= FLAGS.num_pretrain_steps,
train_rng=train_rngs)
metrics, latent_metrics = jax.tree_map(np.array,
(metrics, latent_metrics))
metrics_all.append(metrics)
latent_metrics_all.append(latent_metrics)
# Save a Checkpoint
if ((step % FLAGS.checkpoint_freq == 0 and step > 0)
or step == FLAGS.num_train_steps - 1):
if jax.host_id() == 0:
# Save unreplicated optimizer + model state.
checkpoints.save_checkpoint(
os.path.join(FLAGS.save_dir, 'checkpoints', hparam_str),
jax_utils.unreplicate(state), step)
# Periodic metric handling.
if not step or step % FLAGS.log_freq != 0:
continue
logging.info('Gathering training metrics.')
# Training Metrics
metrics_all = common_utils.get_metrics(metrics_all)
lr = metrics_all.pop('learning_rate').mean()
metrics_sums = jax.tree_map(jnp.sum, metrics_all)
denominator = metrics_sums.pop('denominator')
summary = jax.tree_map(
lambda x: x / denominator, # pylint: disable=cell-var-from-loop
metrics_sums)
summary['learning_rate'] = lr
# Calculate (clipped) perplexity after averaging log-perplexities:
summary['perplexity'] = jnp.clip(jnp.exp(summary['loss']), a_max=1.0e4)
latent_metrics_all = common_utils.get_metrics(latent_metrics_all)
metrics_sums = jax.tree_map(jnp.sum, latent_metrics_all)
denominator = metrics_sums.pop('denominator')
summary.update(
jax.tree_map(
lambda x: x / denominator, # pylint: disable=cell-var-from-loop
metrics_sums))
if jax.host_id() == 0:
logging.info('Train in step: %d, loss: %.4f, acc: %.4f', step,
summary['loss'], summary['accuracy'])
tock = time.time()
steps_per_sec = FLAGS.log_freq / (tock - tick)
tick = tock
summary_writer.scalar('train/steps per second', steps_per_sec,
step)
for key, val in summary.items():
summary_writer.scalar('train/' + key, val, step)
summary_writer.flush()
# Reset metric accumulation for next evaluation cycle.
metrics_all = []
latent_metrics_all = []
# Evaluation Metrics
logging.info('Gathering evaluation metrics.')
t_evaluation_start = time.time()
eval_metrics = []
latent_eval_metrics = []
for batches in eval_ds.as_numpy_iterator():
inputs, outputs, programs = common_utils.shard(batches)
all_metrics = p_eval_step(state, inputs, outputs, programs)
metrics, latent_metrics = jax.tree_map(np.array, all_metrics)
eval_metrics.append(metrics)
latent_eval_metrics.append(latent_metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
eval_metrics_sums = jax.tree_map(jnp.sum, eval_metrics)
eval_denominator = eval_metrics_sums.pop('denominator')
eval_summary = jax.tree_map(
lambda x: x / eval_denominator, # pylint: disable=cell-var-from-loop
eval_metrics_sums)
latent_eval_metrics = common_utils.get_metrics(latent_eval_metrics)
eval_metrics_sums = jax.tree_map(jnp.sum, latent_eval_metrics)
eval_denominator = eval_metrics_sums.pop('denominator')
eval_summary.update(
jax.tree_map(
lambda x: x / eval_denominator, # pylint: disable=cell-var-from-loop
eval_metrics_sums))
if jax.host_id() == 0:
logging.info('Evaluation time: %.4f s step %d, loss: %.4f',
time.time() - t_evaluation_start, step,
eval_summary['loss'])
for key, val in eval_summary.items():
summary_writer.scalar('eval/' + key, val, step)
summary_writer.flush()
# Beam search metrics.
logging.info('Gathering beam search metrics.')
for beam_size in [10, 50, 100]:
t_inference_start = time.time()
pred_acc = 0
pred_denominator = 0
ios, targets, predictions, latent_predictions = [], [], [], []
for batches in predict_ds.as_numpy_iterator():
pred_batch = batches
# Handle final odd-sized batch by padding instead of dropping it.
cur_pred_batch_size = pred_batch[0].shape[0]
if cur_pred_batch_size % n_devices:
padded_size = int(
np.ceil(cur_pred_batch_size / n_devices) * n_devices)
pred_batch = jax.tree_map(
lambda x: pad_examples(x, padded_size), pred_batch) # pylint: disable=cell-var-from-loop
inputs, outputs, programs = common_utils.shard(pred_batch)
cache, lp_cache = p_init_cache(inputs, outputs, programs)
predicted, latent_predicted = p_pred_step(
state, inputs, outputs, cache, lp_cache, beam_size)
predicted, latent_predicted = map(
tohost, (predicted, latent_predicted))
inputs, outputs, programs = map(tohost,
(inputs, outputs, programs))
pred_denominator += programs.shape[0]
for i, beams in enumerate(predicted):
inps, outs, io_string = decode_io(inputs[i], outputs[i])
p, p_idx, p_score = eval_predicted(
beams,
inps,
outs,
parse_beam_fn=lambda x: decode_program(x)[0])
if p_score >= len(inps):
pred_acc += 1
ios.append(io_string)
targets.append(decode_program(programs[i])[1])
predictions.append(p.to_string() if p else '')
latent_predictions.append(' '.join(
list(np.array(latent_predicted[i,
p_idx]).astype(str))))
all_pred_acc, all_pred_denominator = per_host_sum_pmap(
jax.tree_map(np.array, (pred_acc, pred_denominator)))
# Record beam search results as text summaries.
message = []
for n in np.random.choice(np.arange(len(predictions)), 8):
text = (f'ios: {ios[n]}\n\ntarget: {targets[n]}\n\n'
f'predicted: {predictions[n]}\n\n'
f'latent_predicted: {latent_predictions[n]}\n\n')
message.append(text)
# Write to tensorboard.
if jax.host_id() == 0:
logging.info(
'Prediction time (beam %d): %.4f s step %d, score %.4f.',
beam_size,
time.time() - t_inference_start, step,
all_pred_acc / all_pred_denominator)
summary_writer.scalar('predict/score-{}'.format(beam_size),
all_pred_acc / all_pred_denominator,
step)
summary_writer.text('samples-{}'.format(beam_size),
'\n------\n'.join(message), step)
summary_writer.flush()
def replicate(self):
return jax_utils.replicate(self).replace(dropout_rng=shard_prng_key(self.dropout_rng))
beta1=training_args.adam_beta1,
beta2=training_args.adam_beta2,
).create(model.params)
# Create learning rate scheduler
# warmup_steps = 0 causes the Flax optimizer to return NaNs; warmup_steps = 1 is functionally equivalent.
lr_scheduler_fn = create_learning_rate_scheduler(
base_learning_rate=training_args.learning_rate,
warmup_steps=max(training_args.warmup_steps, 1))
# Create parallel version of the training and evaluation steps
p_training_step = jax.pmap(training_step, "batch", donate_argnums=(0, ))
p_eval_step = jax.pmap(eval_step, "batch", donate_argnums=(0, ))
# Replicate the optimizer on each device
optimizer = jax_utils.replicate(optimizer)
# Store some constant
nb_epochs = int(training_args.num_train_epochs)
batch_size = int(
training_args.per_device_train_batch_size) * jax.device_count()
eval_batch_size = int(
training_args.per_device_eval_batch_size) * jax.device_count()
epochs = tqdm(range(nb_epochs),
desc=f"Epoch ... (1/{nb_epochs})",
position=0)
for epoch in epochs:
# ======================== Training ================================
# Create sampling rng
def main(config, output_dir):
seed = config.get('seed', 0)
rng = jax.random.PRNGKey(seed)
tf.random.set_seed(seed)
if config.get('data_dir'):
logging.info('data_dir=%s', config.data_dir)
logging.info('Output dir: %s', output_dir)
save_checkpoint_path = None
if config.get('checkpoint_steps'):
gfile.makedirs(output_dir)
save_checkpoint_path = os.path.join(output_dir, 'checkpoint.npz')
# Create an asynchronous multi-metric writer.
writer = metric_writers.create_default_writer(
output_dir, just_logging=jax.process_index() > 0)
# The pool is used to perform misc operations such as logging in async way.
pool = multiprocessing.pool.ThreadPool()
def write_note(note):
if jax.process_index() == 0:
logging.info('NOTE: %s', note)
write_note('Initializing...')
# Verify settings to make sure no checkpoints are accidentally missed.
if config.get('keep_checkpoint_steps'):
assert config.get('checkpoint_steps'), 'Specify `checkpoint_steps`.'
assert config.keep_checkpoint_steps % config.checkpoint_steps == 0, (
f'`keep_checkpoint_steps` ({config.checkpoint_steps}) should be'
f'divisible by `checkpoint_steps ({config.checkpoint_steps}).`')
batch_size = config.batch_size
batch_size_eval = config.get('batch_size_eval', batch_size)
if (batch_size % jax.device_count() != 0
or batch_size_eval % jax.device_count() != 0):
raise ValueError(
f'Batch sizes ({batch_size} and {batch_size_eval}) must '
f'be divisible by device number ({jax.device_count()})')
local_batch_size = batch_size // jax.process_count()
local_batch_size_eval = batch_size_eval // jax.process_count()
logging.info(
'Global batch size %d on %d hosts results in %d local batch size. '
'With %d dev per host (%d dev total), that is a %d per-device batch size.',
batch_size, jax.process_count(), local_batch_size,
jax.local_device_count(), jax.device_count(),
local_batch_size // jax.local_device_count())
write_note('Initializing train dataset...')
rng, train_ds_rng = jax.random.split(rng)
train_ds_rng = jax.random.fold_in(train_ds_rng, jax.process_index())
train_ds = input_utils.get_data(
dataset=config.dataset,
split=config.train_split,
rng=train_ds_rng,
process_batch_size=local_batch_size,
preprocess_fn=preprocess_spec.parse(
spec=config.pp_train, available_ops=preprocess_utils.all_ops()),
shuffle_buffer_size=config.shuffle_buffer_size,
prefetch_size=config.get('prefetch_to_host', 2),
data_dir=config.get('data_dir'))
logging.info('image_size = %s', train_ds.element_spec['image'].shape[1:])
# Start prefetching already.
train_iter = input_utils.start_input_pipeline(
train_ds, config.get('prefetch_to_device', 1))
write_note('Initializing val dataset(s)...')
def _get_val_split(dataset, split, pp_eval, data_dir=None):
# We do ceil rounding such that we include the last incomplete batch.
nval_img = input_utils.get_num_examples(
dataset,
split=split,
process_batch_size=local_batch_size_eval,
drop_remainder=False,
data_dir=data_dir)
val_steps = int(np.ceil(nval_img / batch_size_eval))
logging.info('Running validation for %d steps for %s, %s', val_steps,
dataset, split)
if isinstance(pp_eval, str):
pp_eval = preprocess_spec.parse(
spec=pp_eval, available_ops=preprocess_utils.all_ops())
val_ds = input_utils.get_data(dataset=dataset,
split=split,
rng=None,
process_batch_size=local_batch_size_eval,
preprocess_fn=pp_eval,
cache=config.get('val_cache', 'batched'),
num_epochs=1,
repeat_after_batching=True,
shuffle=False,
prefetch_size=config.get(
'prefetch_to_host', 2),
drop_remainder=False,
data_dir=data_dir)
return val_ds
val_ds_splits = {
'val':
_get_val_split(config.dataset, config.val_split, config.pp_eval,
config.get('data_dir'))
}
if config.get('test_split'):
val_ds_splits.update({
'test':
_get_val_split(config.dataset,
split=config.test_split,
pp_eval=config.pp_eval,
data_dir=config.get('data_dir'))
})
if config.get('eval_on_cifar_10h'):
cifar10_to_cifar10h_fn = data_uncertainty_utils.create_cifar10_to_cifar10h_fn(
config.get('data_dir', None))
preprocess_fn = preprocess_spec.parse(
spec=config.pp_eval_cifar_10h,
available_ops=preprocess_utils.all_ops())
pp_eval = lambda ex: preprocess_fn(cifar10_to_cifar10h_fn(ex))
val_ds_splits['cifar_10h'] = _get_val_split(
'cifar10',
split=config.get('cifar_10h_split') or 'test',
pp_eval=pp_eval,
data_dir=config.get('data_dir'))
elif config.get('eval_on_imagenet_real'):
imagenet_to_real_fn = data_uncertainty_utils.create_imagenet_to_real_fn(
)
preprocess_fn = preprocess_spec.parse(
spec=config.pp_eval_imagenet_real,
available_ops=preprocess_utils.all_ops())
pp_eval = lambda ex: preprocess_fn(imagenet_to_real_fn(ex))
val_ds_splits['imagenet_real'] = _get_val_split(
'imagenet2012_real',
split=config.get('imagenet_real_split') or 'validation',
pp_eval=pp_eval,
data_dir=config.get('data_dir'))
ood_ds = {}
if config.get('ood_datasets') and config.get('ood_methods'):
if config.get(
'ood_methods'): # config.ood_methods is not a empty list
logging.info('loading OOD dataset = %s',
config.get('ood_datasets'))
ood_ds, ood_ds_names = ood_utils.load_ood_datasets(
config.dataset,
config.ood_datasets,
config.ood_split,
config.pp_eval,
config.pp_eval_ood,
config.ood_methods,
config.train_split,
config.get('data_dir'),
_get_val_split,
)
ntrain_img = input_utils.get_num_examples(
config.dataset,
split=config.train_split,
process_batch_size=local_batch_size,
data_dir=config.get('data_dir'))
steps_per_epoch = int(ntrain_img / batch_size)
if config.get('num_epochs'):
total_steps = int(config.num_epochs * steps_per_epoch)
assert not config.get(
'total_steps'), 'Set either num_epochs or total_steps'
else:
total_steps = config.total_steps
logging.info('Total train data points: %d', ntrain_img)
logging.info(
'Running for %d steps, that means %f epochs and %d steps per epoch',
total_steps, total_steps * batch_size / ntrain_img, steps_per_epoch)
write_note('Initializing model...')
logging.info('config.model = %s', config.get('model'))
# Specify Gaussian process layer configs.
use_gp_layer = config.get('use_gp_layer', True)
gp_config = config.get('gp_layer', {})
gp_layer_kwargs = get_gp_kwargs(gp_config)
# Process ViT backbone model configs.
vit_kwargs = config.get('model')
model = ub.models.vision_transformer_gp(num_classes=config.num_classes,
use_gp_layer=use_gp_layer,
vit_kwargs=vit_kwargs,
gp_layer_kwargs=gp_layer_kwargs)
# We want all parameters to be created in host RAM, not on any device, they'll
# be sent there later as needed, otherwise we already encountered two
# situations where we allocate them twice.
@partial(jax.jit, backend='cpu')
def init(rng):
image_size = tuple(train_ds.element_spec['image'].shape[2:])
logging.info('image_size = %s', image_size)
dummy_input = jnp.zeros((local_batch_size, ) + image_size, jnp.float32)
variables = model.init(rng, dummy_input, train=False)
# Split model parameters into trainable and untrainable collections.
states, params = variables.pop('params')
del variables
# Set bias in the head to a low value, such that loss is small initially.
params = flax.core.unfreeze(params)
if use_gp_layer:
# Modify the head parameter in the GP head.
params['head']['output_layer']['bias'] = jnp.full_like(
params['head']['output_layer']['bias'],
config.get('init_head_bias', 0))
else:
params['head']['bias'] = jnp.full_like(
params['head']['bias'], config.get('init_head_bias', 0))
return params, states
rng, rng_init = jax.random.split(rng)
params_cpu, states_cpu = init(rng_init)
if jax.process_index() == 0:
num_params = sum(p.size for p in jax.tree_flatten(params_cpu)[0])
parameter_overview.log_parameter_overview(params_cpu)
writer.write_scalars(step=0, scalars={'num_params': num_params})
@partial(jax.pmap, axis_name='batch')
def evaluation_fn(params, states, images, labels, mask):
# Ignore the entries with all zero labels for evaluation.
mask *= labels.max(axis=1)
variable_dict = {'params': flax.core.freeze(params), **states}
logits, out = model.apply(variable_dict,
images,
train=False,
mean_field_factor=gp_config.get(
'mean_field_factor', -1.))
# Note that logits and labels are usually of the shape [batch,num_classes].
# But for OOD data, when num_classes_ood > num_classes_ind, we need to
# adjust labels to labels[:, :config.num_classes] to match the shape of
# logits. That is just to avoid shape mismatch. The output losses does not
# have any meaning for OOD data, because OOD not belong to any IND class.
losses = getattr(train_utils, config.get('loss', 'sigmoid_xent'))(
logits=logits,
labels=labels[:, :config.num_classes],
reduction=False)
loss = jax.lax.psum(losses * mask, axis_name='batch')
top1_idx = jnp.argmax(logits, axis=1)
# Extracts the label at the highest logit index for each image.
top1_correct = jnp.take_along_axis(labels, top1_idx[:, None],
axis=1)[:, 0]
ncorrect = jax.lax.psum(top1_correct * mask, axis_name='batch')
n = jax.lax.psum(mask, axis_name='batch')
metric_args = jax.lax.all_gather(
[logits, labels, out['pre_logits'], mask], axis_name='batch')
return ncorrect, loss, n, metric_args
@partial(jax.pmap, axis_name='batch')
def cifar_10h_evaluation_fn(params, states, images, labels, mask):
variable_dict = {'params': flax.core.freeze(params), **states}
logits, out = model.apply(variable_dict,
images,
train=False,
mean_field_factor=gp_config.get(
'mean_field_factor', -1.))
losses = getattr(train_utils,
config.get('loss', 'softmax_xent'))(logits=logits,
labels=labels,
reduction=False)
loss = jax.lax.psum(losses, axis_name='batch')
top1_idx = jnp.argmax(logits, axis=1)
# Extracts the label at the highest logit index for each image.
one_hot_labels = jnp.eye(10)[jnp.argmax(labels, axis=1)]
top1_correct = jnp.take_along_axis(one_hot_labels,
top1_idx[:, None],
axis=1)[:, 0]
ncorrect = jax.lax.psum(top1_correct, axis_name='batch')
n = jax.lax.psum(one_hot_labels, axis_name='batch')
metric_args = jax.lax.all_gather(
[logits, labels, out['pre_logits'], mask], axis_name='batch')
return ncorrect, loss, n, metric_args
# Setup function for computing representation.
@partial(jax.pmap, axis_name='batch')
def representation_fn(params, images, labels, mask, states):
variable_dict = {'params': flax.core.freeze(params), **states}
_, outputs = model.apply(variable_dict,
images,
train=False,
mean_field_factor=gp_config.get(
'mean_field_factor', -1.))
representation = outputs[config.fewshot.representation_layer]
representation = jax.lax.all_gather(representation, 'batch')
labels = jax.lax.all_gather(labels, 'batch')
mask = jax.lax.all_gather(mask, 'batch')
return representation, labels, mask
# Load the optimizer from flax.
opt_name = config.get('optim_name')
write_note(f'Initializing {opt_name} optimizer...')
opt_def = getattr(flax.optim, opt_name)(**config.get('optim', {}))
# We jit this, such that the arrays that are created are created on the same
# device as the input is, in this case the CPU. Else they'd be on device[0].
opt_cpu = jax.jit(opt_def.create)(params_cpu)
weight_decay_rules = config.get('weight_decay', []) or []
rescale_value = config.lr.base if config.get(
'weight_decay_decouple') else 1.
weight_decay_fn = train_utils.get_weight_decay_fn(
weight_decay_rules=weight_decay_rules, rescale_value=rescale_value)
@partial(jax.pmap, axis_name='batch', donate_argnums=(0, ))
def update_fn(opt, states, lr, reset_covmat, images, labels, rng):
"""Update step."""
measurements = {}
# Get device-specific loss rng.
rng, rng_model = jax.random.split(rng, 2)
rng_model_local = jax.random.fold_in(rng_model,
jax.lax.axis_index('batch'))
def loss_fn(params, states, images, labels):
# Specify mutable collection to update untrainable GP parameters.
variable_dict = {'params': flax.core.freeze(params), **states}
model_results, updated_states = model.apply(
variable_dict,
images,
train=True,
rngs={'dropout': rng_model_local},
mutable=list(states.keys()),
mean_field_factor=gp_config.get('mean_field_factor', -1.))
logits, _ = model_results
loss = getattr(train_utils,
config.get('loss', 'sigmoid_xent'))(logits=logits,
labels=labels)
return loss, updated_states
# Performs exact covariance update (i.e., reset precision matrix resetting
# at begining of new epoch) if covmat_momentum is a null value.
if use_gp_layer and gp_config.get('covmat_momentum', -1.) < 0:
# Resets precision matrix to Identity * ridge_penalty if at the begining
# of a new epoch. This should be done before accumulate gradient.
ridge_penalty = gp_config.get('ridge_penalty', 1.)
prec_mat_old = states['laplace_covariance']['head'][
'covmat_layer']['precision_matrix']
prec_mat_new = (
(1. - reset_covmat) * prec_mat_old +
reset_covmat * jnp.eye(prec_mat_old.shape[0]) * ridge_penalty)
states = flax.core.unfreeze(states)
states['laplace_covariance']['head']['covmat_layer'][
'precision_matrix'] = prec_mat_new
states = flax.core.freeze(states)
# Implementation considerations compared and summarized at
# https://docs.google.com/document/d/1g3kMEvqu1DOawaflKNyUsIoQ4yIVEoyE5ZlIPkIl4Lc/edit?hl=en#
(l, s), g = train_utils.accumulate_gradient_with_states(
jax.value_and_grad(loss_fn, has_aux=True), opt.target, states,
images, labels, config.get('grad_accum_steps'))
l, g = jax.lax.pmean((l, g), axis_name='batch')
# Log the gradient norm only if we need to compute it anyways (clipping)
# or if we don't use grad_accum_steps, as they interact badly.
do_grad_clip = config.get('grad_clip_norm', -1.) > 0.
if config.get('grad_accum_steps', 1) == 1 or do_grad_clip:
grads, _ = jax.tree_flatten(g)
l2_g = jnp.sqrt(sum([jnp.vdot(p, p) for p in grads]))
measurements['l2_grads'] = l2_g
# Optionally resize the global gradient to a maximum norm. We found this
# useful in some cases across optimizers, hence it's in the main loop.
if do_grad_clip:
g_factor = jnp.minimum(1.0, config.grad_clip_norm / l2_g)
g = jax.tree_map(lambda p: g_factor * p, g)
opt = opt.apply_gradient(g, learning_rate=lr)
opt = opt.replace(target=weight_decay_fn(opt.target, lr))
params, _ = jax.tree_flatten(opt.target)
measurements['l2_params'] = jnp.sqrt(
sum([jnp.vdot(p, p) for p in params]))
measurements['reset_covmat'] = reset_covmat
return opt, s, l, rng, measurements
default_reinit_params = ('head/output_layer/kernel',
'head/output_layer/bias', 'head/kernel',
'head/bias')
rng, train_loop_rngs = jax.random.split(rng)
checkpoint_data = checkpoint_utils.maybe_load_checkpoint(
train_loop_rngs=train_loop_rngs,
save_checkpoint_path=save_checkpoint_path,
init_optimizer=opt_cpu,
init_params=params_cpu,
init_fixed_model_states=states_cpu,
default_reinit_params=default_reinit_params,
config=config)
train_loop_rngs = checkpoint_data.train_loop_rngs
opt_cpu = checkpoint_data.optimizer
states_cpu = checkpoint_data.fixed_model_states
accumulated_train_time = checkpoint_data.accumulated_train_time
write_note('Adapting the checkpoint model...')
adapted_params = checkpoint_utils.adapt_upstream_architecture(
init_params=params_cpu, loaded_params=opt_cpu.target)
opt_cpu = opt_cpu.replace(target=adapted_params)
write_note('Kicking off misc stuff...')
first_step = int(opt_cpu.state.step) # Might be a DeviceArray type.
if first_step == 0 and jax.process_index() == 0:
writer.write_hparams(dict(config))
chrono = train_utils.Chrono(first_step, total_steps, batch_size,
accumulated_train_time)
# Note: switch to ProfileAllHosts() if you need to profile all hosts.
# (Xprof data become much larger and take longer to load for analysis)
profiler = periodic_actions.Profile(
# Create profile after every restart to analyze pre-emption related
# problems and assure we get similar performance in every run.
logdir=output_dir,
first_profile=first_step + 10)
# Prepare the learning-rate and pre-fetch it to device to avoid delays.
lr_fn = train_utils.create_learning_rate_schedule(total_steps,
**config.get('lr', {}))
# TODO(dusenberrymw): According to flax docs, prefetching shouldn't be
# necessary for TPUs.
lr_iter = train_utils.prefetch_scalar(map(lr_fn, range(total_steps)),
config.get('prefetch_to_device', 1))
# Prepare the precision matrix resetting schedule, and pre-fetch it to device.
reset_covmat_fn = lambda step: float(step % steps_per_epoch == 0)
reset_covmat_iter = train_utils.prefetch_scalar(
map(reset_covmat_fn, range(first_step, total_steps)),
nprefetch=config.get('prefetch_to_device', 1))
write_note(f'Replicating...\n{chrono.note}')
opt_repl = flax_utils.replicate(opt_cpu)
states_repl = flax_utils.replicate(states_cpu)
write_note(f'Initializing few-shotters...\n{chrono.note}')
fewshotter = None
if 'fewshot' in config and fewshot is not None:
fewshotter = fewshot.FewShotEvaluator(
representation_fn, config.fewshot,
config.fewshot.get('batch_size') or batch_size_eval)
checkpoint_writer = None
# Note: we return the train loss, val loss, and fewshot best l2s for use in
# reproducibility unit tests.
train_loss = -jnp.inf
val_loss = {val_name: -jnp.inf for val_name, _ in val_ds_splits.items()}
fewshot_results = {'dummy': {(0, 1): -jnp.inf}}
write_note(f'First step compilations...\n{chrono.note}')
logging.info('first_step = %s', first_step)
# Advance the iterators if we are restarting from an earlier checkpoint.
# TODO(dusenberrymw): Look into checkpointing dataset state instead.
# Makes sure log_eval_steps is same as steps_per_epoch. This is because
# the precision matrix needs to be updated fully (at the end of each epoch)
# when eval takes place.
log_eval_steps = steps_per_epoch
if first_step > 0:
write_note('Advancing iterators after resuming from a checkpoint...')
lr_iter = itertools.islice(lr_iter, first_step, None)
train_iter = itertools.islice(train_iter, first_step, None)
# Using a python integer for step here, because opt.state.step is allocated
# on TPU during replication.
for step, train_batch, lr_repl, reset_covmat_repl in zip(
range(first_step + 1, total_steps + 1), train_iter, lr_iter,
reset_covmat_iter):
with jax.profiler.TraceAnnotation('train_step', step_num=step, _r=1):
# TODO(jereliu): Expand to allow precision matrix resetting.
(opt_repl, states_repl, loss_value, train_loop_rngs,
extra_measurements) = update_fn(opt_repl,
states_repl,
lr_repl,
reset_covmat_repl,
train_batch['image'],
train_batch['labels'],
rng=train_loop_rngs)
if jax.process_index() == 0:
profiler(step)
# Checkpoint saving
if train_utils.itstime(step,
config.get('checkpoint_steps'),
total_steps,
process=0):
write_note('Checkpointing...')
chrono.pause()
train_utils.checkpointing_timeout(
checkpoint_writer, config.get('checkpoint_timeout', 1))
accumulated_train_time = chrono.accum_train_time
# We need to transfer the weights over now or else we risk keeping them
# alive while they'll be updated in a future step, creating hard to debug
# memory errors (see b/160593526). Also, takes device 0's params only.
# For GP layer, we will also do the same for untrainable parameters
# (`states`). This is ok since `random features` are frozen throughout
# pre-training, and `precision matrix` is a finetuning-specific parameters
# that will be re-learned in the finetuning task.
opt_cpu = jax.tree_map(lambda x: np.array(x[0]), opt_repl)
states_cpu = jax.tree_map(lambda x: np.array(x[0]), states_repl)
# Check whether we want to keep a copy of the current checkpoint.
copy_step = None
if train_utils.itstime(step, config.get('keep_checkpoint_steps'),
total_steps):
write_note('Keeping a checkpoint copy...')
copy_step = step
# Checkpoint should be a nested dictionary or FLAX datataclasses from
# `flax.struct`. Both can be present in a checkpoint.
checkpoint_data = checkpoint_utils.CheckpointData(
optimizer=opt_cpu,
fixed_model_states=states_cpu,
train_loop_rngs=train_loop_rngs,
accumulated_train_time=accumulated_train_time)
checkpoint_writer = pool.apply_async(
checkpoint_utils.checkpoint_trained_model,
(checkpoint_data, save_checkpoint_path, copy_step))
chrono.resume()
# Report training progress
if train_utils.itstime(step,
config.log_training_steps,
total_steps,
process=0):
write_note('Reporting training progress...')
train_loss = loss_value[
0] # Keep to return for reproducibility tests.
timing_measurements, note = chrono.tick(step)
write_note(note)
train_measurements = {}
train_measurements.update({
'learning_rate': lr_repl[0],
'training_loss': train_loss,
})
train_measurements.update(
flax.jax_utils.unreplicate(extra_measurements))
train_measurements.update(timing_measurements)
writer.write_scalars(step, train_measurements)
# Report validation performance
if train_utils.itstime(step, log_eval_steps, total_steps):
write_note('Evaluating on the validation set...')
chrono.pause()
for val_name, val_ds in val_ds_splits.items():
# Sets up evaluation metrics.
ece_num_bins = config.get('ece_num_bins', 15)
auc_num_bins = config.get('auc_num_bins', 1000)
ece = rm.metrics.ExpectedCalibrationError(
num_bins=ece_num_bins)
calib_auc = rm.metrics.CalibrationAUC(
correct_pred_as_pos_label=False)
# TODO(jereliu): Extend to support soft multi-class probabilities.
oc_auc_0_5 = rm.metrics.OracleCollaborativeAUC(
oracle_fraction=0.005, num_bins=auc_num_bins)
oc_auc_1 = rm.metrics.OracleCollaborativeAUC(
oracle_fraction=0.01, num_bins=auc_num_bins)
oc_auc_2 = rm.metrics.OracleCollaborativeAUC(
oracle_fraction=0.02, num_bins=auc_num_bins)
oc_auc_5 = rm.metrics.OracleCollaborativeAUC(
oracle_fraction=0.05, num_bins=auc_num_bins)
label_diversity = tf.keras.metrics.Mean()
sample_diversity = tf.keras.metrics.Mean()
ged = tf.keras.metrics.Mean()
# Runs evaluation loop.
val_iter = input_utils.start_input_pipeline(
val_ds, config.get('prefetch_to_device', 1))
ncorrect, loss, nseen = 0, 0, 0
for batch in val_iter:
if val_name == 'cifar_10h':
batch_ncorrect, batch_losses, batch_n, batch_metric_args = (
cifar_10h_evaluation_fn(opt_repl.target,
states_repl,
batch['image'],
batch['labels'],
batch['mask']))
else:
batch_ncorrect, batch_losses, batch_n, batch_metric_args = (
evaluation_fn(opt_repl.target, states_repl,
batch['image'], batch['labels'],
batch['mask']))
# All results are a replicated array shaped as follows:
# (local_devices, per_device_batch_size, elem_shape...)
# with each local device's entry being identical as they got psum'd.
# So let's just take the first one to the host as numpy.
ncorrect += np.sum(np.array(batch_ncorrect[0]))
loss += np.sum(np.array(batch_losses[0]))
nseen += np.sum(np.array(batch_n[0]))
if config.get('loss', 'sigmoid_xent') != 'sigmoid_xent':
# Here we parse batch_metric_args to compute uncertainty metrics.
# (e.g., ECE or Calibration AUC).
logits, labels, _, masks = batch_metric_args
masks = np.array(masks[0], dtype=np.bool)
logits = np.array(logits[0])
probs = jax.nn.softmax(logits)
# From one-hot to integer labels, as required by ECE.
int_labels = np.argmax(np.array(labels[0]), axis=-1)
int_preds = np.argmax(logits, axis=-1)
confidence = np.max(probs, axis=-1)
for p, c, l, d, m, label in zip(
probs, confidence, int_labels, int_preds,
masks, labels[0]):
ece.add_batch(p[m, :], label=l[m])
calib_auc.add_batch(d[m],
label=l[m],
confidence=c[m])
oc_auc_0_5.add_batch(d[m],
label=l[m],
custom_binning_score=c[m])
oc_auc_1.add_batch(d[m],
label=l[m],
custom_binning_score=c[m])
oc_auc_2.add_batch(d[m],
label=l[m],
custom_binning_score=c[m])
oc_auc_5.add_batch(d[m],
label=l[m],
custom_binning_score=c[m])
if val_name == 'cifar_10h' or val_name == 'imagenet_real':
batch_label_diversity, batch_sample_diversity, batch_ged = data_uncertainty_utils.generalized_energy_distance(
label[m], p[m, :], config.num_classes)
label_diversity.update_state(
batch_label_diversity)
sample_diversity.update_state(
batch_sample_diversity)
ged.update_state(batch_ged)
val_loss[
val_name] = loss / nseen # Keep for reproducibility tests.
val_measurements = {
f'{val_name}_prec@1': ncorrect / nseen,
f'{val_name}_loss': val_loss[val_name]
}
if config.get('loss', 'sigmoid_xent') != 'sigmoid_xent':
val_measurements[f'{val_name}_ece'] = ece.result()['ece']
val_measurements[
f'{val_name}_calib_auc'] = calib_auc.result(
)['calibration_auc']
val_measurements[
f'{val_name}_oc_auc_0.5%'] = oc_auc_0_5.result(
)['collaborative_auc']
val_measurements[
f'{val_name}_oc_auc_1%'] = oc_auc_1.result(
)['collaborative_auc']
val_measurements[
f'{val_name}_oc_auc_2%'] = oc_auc_2.result(
)['collaborative_auc']
val_measurements[
f'{val_name}_oc_auc_5%'] = oc_auc_5.result(
)['collaborative_auc']
writer.write_scalars(step, val_measurements)
if val_name == 'cifar_10h' or val_name == 'imagenet_real':
cifar_10h_measurements = {
f'{val_name}_label_diversity':
label_diversity.result(),
f'{val_name}_sample_diversity':
sample_diversity.result(),
f'{val_name}_ged': ged.result(),
}
writer.write_scalars(step, cifar_10h_measurements)
# OOD eval
# There are two entries in the ood_ds dict (in-dist, ood), and that this
# section computes metrics using both pieces. This is in contrast to
# normal validation eval above where we eval metrics separately for each
# val split in val_ds.
if ood_ds and config.ood_methods:
def make_sngp_eval_fn(states):
def sngp_eval_fn(params, images, labels, mask):
return evaluation_fn(params=params,
states=states,
images=images,
labels=labels,
mask=mask)
return sngp_eval_fn
ood_measurements = ood_utils.eval_ood_metrics(
ood_ds,
ood_ds_names,
config.ood_methods,
make_sngp_eval_fn(states_repl),
opt_repl.target,
n_prefetch=config.get('prefetch_to_device', 1))
writer.write_scalars(step, ood_measurements)
chrono.resume()
if 'fewshot' in config and fewshotter is not None:
# Compute few-shot on-the-fly evaluation.
if train_utils.itstime(step, config.fewshot.log_steps,
total_steps):
chrono.pause()
write_note(f'Few-shot evaluation...\n{chrono.note}')
# Keep `results` to return for reproducibility tests.
fewshot_results, best_l2 = fewshotter.run_all(
opt_repl.target,
datasets=config.fewshot.datasets,
states=states_repl)
# TODO(dusenberrymw): Remove this once fewshot.py is updated.
def make_writer_measure_fn(step):
def writer_measure(name, value):
writer.write_scalars(step, {name: value})
return writer_measure
fewshotter.walk_results(make_writer_measure_fn(step),
fewshot_results, best_l2)
chrono.resume()
# End of step.
if config.get('testing_failure_step'):
# Break early to simulate infra failures in test cases.
if config.testing_failure_step == step:
break
write_note(f'Done!\n{chrono.note}')
pool.close()
pool.join()
writer.close()
# Return final training loss, validation loss, and fewshot results for
# reproducibility test cases.
return train_loss, val_loss, fewshot_results
def create_synchronized_rng_seed():
rng_seed = np.int64(struct.unpack('q', os.urandom(8))[0])
rng_seed = _sum_seeds_pmapped(jax_utils.replicate(rng_seed))
rng_seed = np.sum(rng_seed)
return rng_seed
def train_and_evaluate(self, workdir):
"""Runs a training and evaluation loop.
Args:
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
"""
tf.io.gfile.makedirs(workdir)
config = self.config
substeps = config.training.substeps
# Learning rate schedule.
num_train_steps = config.training.num_train_steps
logging.info('num_train_steps=%d', num_train_steps)
# Get train state
state = self._train_state
# Set up checkpointing of the model and the input pipeline.
checkpoint_dir = os.path.join(workdir, 'checkpoints')
ckpt = checkpoint.MultihostCheckpoint(checkpoint_dir, max_to_keep=5)
state = ckpt.restore_or_initialize(state)
initial_step = int(state.step)
# Distribute training.
state = flax_utils.replicate(state)
writer = metric_writers.create_default_writer(
workdir, just_logging=jax.process_index() > 0)
if initial_step == 0:
writer.write_hparams(dict(config))
logging.info('Starting training loop at step %d.', initial_step)
hooks = []
report_progress = periodic_actions.ReportProgress(
num_train_steps=num_train_steps, writer=writer)
if jax.process_index() == 0:
hooks += [
report_progress,
periodic_actions.Profile(num_profile_steps=5, logdir=workdir)
]
step = initial_step
with metric_writers.ensure_flushes(writer):
while step < num_train_steps:
# `step` is a Python integer. `state.step` is JAX integer on the GPU/TPU
# devices.
is_last_step = step + substeps >= num_train_steps
with jax.profiler.StepTraceAnnotation('train', step_num=step):
inputs = jax.tree_map(np.asarray, next(self._train_iter))
state, outputs = self._update_func(state, inputs)
# Quick indication that training is happening.
logging.log_first_n(logging.INFO, 'Finished training step %d.',
5, step)
for h in hooks:
h(step)
new_step = int(state.step[0])
assert new_step == step + substeps
step = new_step
is_eval = step % config.logs.eval_full_every_steps == 0 or is_last_step
if step % config.logs.log_loss_every_steps == 0 and not is_eval:
def avg_over_substeps(x):
assert x.shape[0] == substeps
return float(x.mean(axis=0))
# Extract scalars and images.
outputs = flax_utils.unreplicate(outputs)
outputs = jax.tree_map(avg_over_substeps, outputs)
scalars = outputs['scalars']
writer.write_scalars(step, scalars)
if is_eval:
with report_progress.timed('eval_full'):
outputs = self._eval_epoch(params=state.ema_params)
outputs = flax_utils.unreplicate(outputs)
scalars = outputs['scalars']
writer.write_scalars(step, scalars)
if step % config.logs.checkpoint_every_steps == 0 or is_last_step:
with report_progress.timed('checkpoint'):
ckpt.save(flax_utils.unreplicate(state))
logging.info('Finishing training at step %d', num_train_steps)
def eval_checkpoints(
checkpoint_dir,
hps,
rng,
eval_num_batches,
model_cls,
dataset_builder,
dataset_meta_data,
hessian_eval_config,
min_global_step=None,
max_global_step=None,
use_deprecated_checkpointing=True,
):
"""Evaluate the Hessian of the given checkpoints.
Iterates over all checkpoints in the specified directory, loads the checkpoint
then evaluates the Hessian on the given checkpoint. A list of dicts will be
saved to cns at checkpoint_dir/hessian_eval_config['name'].
Args:
checkpoint_dir: Directory of checkpoints to load.
hps: (tf.HParams) Model, initialization and training hparams.
rng: (jax.random.PRNGKey) Rng seed used in model initialization and data
shuffling.
eval_num_batches: (int) The batch size used for evaluating on
validation, and test sets. Set to None to evaluate on the whole test set.
model_cls: One of the model classes (not an instance) defined in model_lib.
dataset_builder: dataset builder returned by datasets.get_dataset.
dataset_meta_data: dict of meta_data about the dataset.
hessian_eval_config: a dict specifying the configuration of the Hessian
eval.
min_global_step: Lower bound on what steps to filter checkpoints. Set to
None to evaluate all checkpoints in the directory.
max_global_step: Upper bound on what steps to filter checkpoints.
use_deprecated_checkpointing: Whether to use deprecated checkpointing.
"""
rng, init_rng = jax.random.split(rng)
rng = jax.random.fold_in(rng, jax.host_id())
rng, data_rng = jax.random.split(rng)
initializer = initializers.get_initializer('noop')
loss_name = 'cross_entropy'
metrics_name = 'classification_metrics'
model = model_cls(hps, dataset_meta_data, loss_name, metrics_name)
# Maybe run the initializer.
flax_module, batch_stats = trainer.initialize(model.flax_module_def,
initializer, model.loss_fn,
hps.input_shape,
hps.output_shape, hps, init_rng,
None)
# Fold in a the unreplicated batch_stats and rng into the loss used by
# hessian eval.
def batch_loss(module, batch_rng):
batch, rng = batch_rng
return model.training_cost(module, batch_stats, batch, rng)[0]
batch_stats = jax_utils.replicate(batch_stats)
if jax.host_id() == 0:
utils.log_pytree_shape_and_statistics(flax_module.params)
logging.info('train_size: %d,', hps.train_size)
logging.info(hps)
# Save the hessian computation hps to the experiment directory
exp_dir = os.path.join(checkpoint_dir, hessian_eval_config['name'])
if not gfile.exists(exp_dir):
gfile.mkdir(exp_dir)
if min_global_step == 0:
hparams_fname = os.path.join(exp_dir, 'hparams.json')
with gfile.GFile(hparams_fname, 'w') as f:
f.write(hps.to_json())
config_fname = os.path.join(exp_dir, 'hconfig.json')
with gfile.GFile(config_fname, 'w') as f:
f.write(json.dumps(hessian_eval_config))
optimizer = trainer.get_optimizer(hps).create(flax_module)
optimizer = jax_utils.replicate(optimizer)
data_rng = jax.random.fold_in(data_rng, 0)
assert hps.batch_size % (jax.device_count()) == 0
dataset = dataset_builder(
data_rng,
hps.batch_size,
eval_batch_size=hps.batch_size, # eval iterators not used.
hps=hps,
)
# pmap functions for the training loop
evaluate_batch_pmapped = jax.pmap(model.evaluate_batch, axis_name='batch')
if jax.host_id() == 0:
logging.info('Starting eval!')
logging.info('Number of hosts: %d', jax.host_count())
hessian_evaluator = hessian_eval.CurvatureEvaluator(
optimizer.target,
hessian_eval_config,
dataset,
batch_loss)
if min_global_step is None:
suffix = ''
else:
suffix = '{}_{}'.format(min_global_step, max_global_step)
pytree_path = os.path.join(checkpoint_dir, hessian_eval_config['name'],
suffix)
logger = utils.MetricLogger(pytree_path=pytree_path)
for checkpoint_path, step in iterate_checkpoints(checkpoint_dir,
min_global_step,
max_global_step):
ckpt = checkpoint.load_checkpoint(
checkpoint_path,
target=(optimizer, batch_stats),
use_deprecated_checkpointing=use_deprecated_checkpointing)
results = trainer.restore_checkpoint(
ckpt,
(optimizer, batch_stats),
use_deprecated_checkpointing=use_deprecated_checkpointing)
optimizer, batch_stats = results[0]
# pylint: disable=protected-access
batch_stats = trainer._maybe_sync_batchnorm_stats(batch_stats)
# pylint: enable=protected-access
report, _ = trainer.eval_metrics(optimizer.target, batch_stats, dataset,
eval_num_batches, eval_num_batches,
evaluate_batch_pmapped)
if jax.host_id() == 0:
logging.info('Global Step: %d', step)
logging.info(report)
row = {}
grads, updates = [], []
hess_evecs, cov_evecs = [], []
stats, hess_evecs, cov_evecs = hessian_evaluator.evaluate_spectrum(
optimizer.target, step)
row.update(stats)
if hessian_eval_config[
'compute_stats'] or hessian_eval_config['compute_interps']:
grads, updates = hessian_evaluator.compute_dirs(optimizer)
row.update(hessian_evaluator.evaluate_stats(optimizer.target, grads,
updates, hess_evecs,
cov_evecs, step))
row.update(hessian_evaluator.compute_interpolations(optimizer.target, grads,
updates, hess_evecs,
cov_evecs, step))
if jax.host_id() == 0:
logger.append_pytree(row)
def compute_is_scores(filename):
"""Compute IS scores for training data."""
# Make sure tf does not allocate gpu memory.
tf.config.experimental.set_visible_devices([], 'GPU')
if FLAGS.jax_backend_target:
jax.config.FLAGS.jax_xla_backend = 'tpu_driver'
jax.config.FLAGS.jax_backend_target = FLAGS.jax_backend_target
# Number of local devices for this host.
n_devices = jax.local_device_count()
if jax.host_id() == 0:
tf.io.gfile.makedirs(FLAGS.model_dir)
if FLAGS.batch_size % n_devices:
raise ValueError('Batch size must be divisible by the number of devices')
vocab_path = FLAGS.vocab_path
if vocab_path is None:
vocab_path = os.path.join(FLAGS.model_dir, 'sentencepiece_model')
tf.io.gfile.makedirs(os.path.split(vocab_path)[0])
# Load Dataset
print('Loading data')
logging.info('Initializing dataset.')
train_ds, encoder = input_pipeline.get_wmt_is_datasets(
n_devices=n_devices,
dataset_name=FLAGS.dataset_name,
shard_idx=jax.host_id(),
shard_count=jax.host_count(),
data_dir=FLAGS.data_dir,
vocab_path=vocab_path,
target_vocab_size=FLAGS.vocab_size,
batch_size=FLAGS.batch_size,
max_length=FLAGS.max_target_length,
paracrawl_size=FLAGS.paracrawl_size)
print('Datasets created')
train_iter = iter(train_ds)
vocab_size = int(encoder.vocab_size())
eos_id = decode.EOS_ID # Default Sentencepiece EOS token.
print('data iterators created')
logging.info('Initializing model, optimizer, and step functions.')
# Build Model and Optimizer
# ---------------------------------------------------------------------------
eval_config = models.TransformerConfig(
vocab_size=vocab_size,
output_vocab_size=vocab_size,
share_embeddings=FLAGS.share_embeddings,
logits_via_embedding=FLAGS.logits_via_embedding,
dtype=jnp.bfloat16 if FLAGS.use_bfloat16 else jnp.float32,
emb_dim=FLAGS.emb_dim,
num_heads=FLAGS.num_heads,
num_layers=FLAGS.num_layers,
qkv_dim=FLAGS.qkv_dim,
mlp_dim=FLAGS.mlp_dim,
max_len=max(FLAGS.max_target_length, FLAGS.max_eval_target_length),
dropout_rate=FLAGS.dropout_rate,
attention_dropout_rate=FLAGS.attention_dropout_rate,
deterministic=True,
decode=False,
kernel_init=nn.initializers.xavier_uniform(),
bias_init=nn.initializers.normal(stddev=1e-6))
start_step = 0
rng = jax.random.PRNGKey(FLAGS.random_seed)
rng, init_rng = jax.random.split(rng)
# It's possible that is supposed to be per device batch size
input_shape = (FLAGS.batch_size, FLAGS.max_target_length)
target_shape = (FLAGS.batch_size, FLAGS.max_target_length)
m = models.Transformer(eval_config)
initial_variables = jax.jit(m.init)(init_rng,
jnp.ones(input_shape, jnp.float32),
jnp.ones(target_shape, jnp.float32))
# apply an optimizer to this tree
optimizer_def = optim.Adam(
FLAGS.learning_rate,
beta1=0.9,
beta2=0.98,
eps=1e-9,
weight_decay=FLAGS.weight_decay)
optimizer = optimizer_def.create(initial_variables['params'])
# We access model params only from optimizer below via optimizer.target.
del initial_variables
if FLAGS.restore_checkpoints:
logging.info('Restoring checkpoint.')
# If we have a pretrained model, use that. Else, just continue where leftoff
model_path = FLAGS.pretrained_model_dir if FLAGS.pretrained_model_dir else FLAGS.model_dir
# When loading a checkpoint trained with adapters (ie. frozen weights)
# restoring from the base optimizer fails. We catch this error and create
# the optimizer with frozen weights.
try:
optimizer = checkpoints.restore_checkpoint(model_path, optimizer)
# Grab last step.
start_step = int(optimizer.state.step)
except ValueError:
adapter = optim.ModelParamTraversal(lambda path, _: FLAGS.adapter in path)
optimizer = optimizer_def.create(optimizer.target, focus=adapter)
optimizer = checkpoints.restore_checkpoint(model_path, optimizer)
start_step = optimizer.state[0].step
else:
raise RuntimeError('Must restore checkpoint for IS')
if FLAGS.adapter != NONE and not isinstance(optimizer, optim.MultiOptimizer):
adapter = optim.ModelParamTraversal(lambda path, _: FLAGS.adapter in path)
optimizer = optimizer_def.create(optimizer.target, focus=adapter)
# Replicate optimizer.
optimizer = jax_utils.replicate(optimizer)
p_eval_step = jax.pmap(
functools.partial(
eval_for_is_step,
config=eval_config),
axis_name='batch')
logging.info('Start scoring loop.')
metrics_all = []
t_loop_start = time.time()
# Eval Metrics
logging.info('Gathering evaluation metrics.')
t_eval_start = time.time()
save_file = FLAGS.is_save_path + '/' + filename + '-lengths.txt'
length_fp = tf.io.gfile.GFile(save_file, 'w')
lengths_writer = csv.writer(length_fp)
save_file = FLAGS.is_save_path + '/' + filename + '.txt'
with tf.io.gfile.GFile(save_file, 'w') as fp:
writer = csv.writer(fp)
for batch_idx, eval_batch in enumerate(train_iter):
eval_batch = jax.tree_map(lambda x: x._numpy(), eval_batch) # pylint: disable=protected-access
cur_pred_batch_size = eval_batch['inputs'].shape[0]
if cur_pred_batch_size % n_devices:
padded_size = int(
np.ceil(cur_pred_batch_size / n_devices) * n_devices)
eval_batch = jax.tree_map(
lambda x: common.pad_examples(x, padded_size), eval_batch) # pylint: disable=cell-var-from-loop
eval_batch = common_utils.shard(eval_batch)
losses, lengths = p_eval_step(optimizer.target, eval_batch)
if jax.host_id() == 0:
losses = common.tohost(losses)
lengths = common.tohost(lengths)
if cur_pred_batch_size % n_devices:
writer.writerow(losses[:cur_pred_batch_size])
lengths_writer.writerow(lengths[:cur_pred_batch_size])
else:
writer.writerow(losses)
lengths_writer.writerow(lengths)
if batch_idx % 500 == 0:
print('Batch', batch_idx)
print(time.time() - t_loop_start)
length_fp.close()
def inference_time(config: ml_collections.ConfigDict, workdir: str):
"""Runs a number of steps and measures inference time."""
assert config.batch, f'Expected --config.batch={config.batch} > 0'
assert config.num_classes, (
f'Expected --config.num_classes={config.num_classes} > 0')
assert config.image_size, (
f'Expected --config.image_size={config.image_size} > 0')
# Build VisionTransformer architecture
model_config = config_lib.MODEL_CONFIGS[config.model_name]
model = models.VisionTransformer(
num_classes=config.num_classes, **model_config)
# Make sure initial model parameters (before replication) are on CPU only.
@functools.partial(jax.jit, backend='cpu')
def init(rng):
return model.init(
rng,
# Discard the "num_local_devices" dimension for initialization.
inputs=jnp.ones([1, config.image_size, config.image_size, 3],
jnp.float32),
train=False)
variables = init(jax.random.PRNGKey(0))
params_repl = flax_utils.replicate(variables['params'])
# pmap replicates the models over all TPUs/GPUs
vit_fn_repl = jax.pmap(functools.partial(model.apply, train=False))
images = jnp.ones([
jax.local_device_count(), config.batch // jax.local_device_count(),
config.image_size, config.image_size, 3
], jnp.float32)
writer = metric_writers.create_default_writer(workdir, asynchronous=False)
writer.write_hparams(config.to_dict())
logging.info('Starting training loop; initial compile can take a while...')
logits = vit_fn_repl(flax.core.FrozenDict(params=params_repl), images)
logits.block_until_ready()
logging.info('Done.')
logging.info('Going to run %d inferences WITHOUT measuring...',
config.initial_steps)
for _ in range(config.initial_steps):
logits = vit_fn_repl(flax.core.FrozenDict(params=params_repl), images)
logits.block_until_ready()
logging.info('Going to run %d inferences measuring...', config.steps)
times = []
for _ in range(config.initial_steps):
t0 = time.time()
logits = vit_fn_repl(flax.core.FrozenDict(params=params_repl), images)
logits.block_until_ready()
times.append(time.time() - t0)
logging.info('times=%s', times)
imgs_sec_core = config.batch / jax.local_device_count() / np.array(times)
logging.info('imgs_sec_core_min=%f', imgs_sec_core.min())
logging.info('imgs_sec_core_max=%f', imgs_sec_core.max())
logging.info('imgs_sec_core_mean=%f', imgs_sec_core.mean())
logging.info('imgs_sec_core_std=%f', imgs_sec_core.std())
writer.write_scalars(
0,
dict(
imgs_sec_core_min=imgs_sec_core.min(),
imgs_sec_core_max=imgs_sec_core.max(),
imgs_sec_core_mean=imgs_sec_core.mean(),
imgs_sec_core_std=imgs_sec_core.std(),
))
def predict_and_evaluate(config, workdir, ckpt_path=None):
"""Runs a testing and evaluation loop.
Args:
config: Configuration to use.
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
ckpt_path: The checkpoint to evaluate. If not specified, use the latest
checkpoint.
"""
logging.info('Starting testing at %s', workdir)
tf.io.gfile.makedirs(workdir)
rng = jax.random.PRNGKey(config.seed)
# Build input pipeline.
rng, data_rng = jax.random.split(rng)
data_rng = jax.random.fold_in(data_rng, jax.process_index())
test_ds = []
for split in config.dataset.test_splits:
ds = input_pipeline.create_val_dataset(
config.dataset, split, config.dataset.test_per_device_batch_size,
config.dataset.test_pad_last_batch)
test_ds.append(ds)
# Initialize model.
inputs = train_utils.get_init_inputs(test_ds[0])
rng, model_rng = jax.random.split(rng)
predict_config = models.TransformerConfig(**config.model.to_dict())
predict_config = predict_config.replace(decode=True)
model = models.Model(predict_config)
state = train_utils.create_train_state(model,
config,
model_rng,
inputs=inputs)
writer = metric_writers.create_default_writer(
workdir, just_logging=jax.process_index() > 0)
# Set up checkpointing of the model and the input pipeline.
checkpoint_dir = os.path.join(workdir, 'checkpoints')
ckpt = checkpoint.MultihostCheckpoint(checkpoint_dir, max_to_keep=3)
logging.info('Testing and evaluating checkpoint %s', ckpt_path)
try:
state = ckpt.restore(state, ckpt_path)
except FileNotFoundError:
state = ckpt.restore_or_initialize(state)
step = int(state.step)
p_pred_step = jax.pmap(functools.partial(predict_step,
config=predict_config),
axis_name='batch',
static_broadcasted_argnums=(3, ))
p_init_cache = jax.pmap(functools.partial(init_cache,
config=predict_config),
axis_name='batch')
# Distribute testing.
state = flax_utils.replicate(state)
with metric_writers.ensure_flushes(writer):
test_metrics = {}
for ds, split in zip(test_ds, config.dataset.test_splits):
ds_metrics = evaluate_sequence_accuracy(p_pred_step, p_init_cache,
state, ds, config, split,
workdir,
config.num_test_steps)
ds_metrics = {f'{k}_{split}': v for k, v in ds_metrics.items()}
test_metrics.update(ds_metrics)
writer.write_scalars(step, test_metrics)
def main(argv):
del argv
config = FLAGS.config
workdir = FLAGS.workdir
logging.info("Workdir: %s", workdir)
save_checkpoint_path = None
if config.get("checkpoint_steps"):
tf.io.gfile.makedirs(workdir)
save_checkpoint_path = os.path.join(workdir, "checkpoint.npz")
# The pool is used to perform misc operations such as logging in async way.
pool = multiprocessing.pool.ThreadPool()
# This seed makes the Jax part of things (like model init) deterministic.
# However, full training still won't be deterministic, for example due to the
# tf.data pipeline not being deterministic even if we would set TF seed.
rng = jax.random.PRNGKey(config.get("seed", 0))
def write_note(note):
if jax.host_id() == 0:
logging.info("NOTE: %s", note)
write_note("Initializing...")
# Verify settings to make sure no checkpoints are accidentally missed.
if config.get("keep_checkpoint_steps"):
assert config.get("checkpoint_steps"), "Specify `checkpoint_steps`."
assert config.keep_checkpoint_steps % config.checkpoint_steps == 0, (
f"`keep_checkpoint_steps` ({config.checkpoint_steps}) should be"
f"divisible by `checkpoint_steps ({config.checkpoint_steps}).`")
batch_size = config.batch_size
batch_size_eval = config.get("batch_size_eval", batch_size)
if (batch_size % jax.device_count() != 0 or
batch_size_eval % jax.device_count() != 0):
raise ValueError(f"Batch sizes ({batch_size} and {batch_size_eval}) must "
f"be divisible by device number ({jax.device_count()})")
local_batch_size = batch_size // jax.host_count()
local_batch_size_eval = batch_size_eval // jax.host_count()
logging.info(
"Global batch size %d on %d hosts results in %d local batch size. "
"With %d dev per host (%d dev total), that's a %d per-device batch size.",
batch_size, jax.host_count(), local_batch_size,
jax.local_device_count(), jax.device_count(),
local_batch_size // jax.local_device_count())
write_note("Initializing train dataset...")
train_ds = input_pipeline.get_data(
dataset=config.dataset,
split=config.train_split,
data_dir=fillin(config.get("dataset_dir")),
batch_size=local_batch_size,
preprocess_fn=pp_builder.get_preprocess_fn(config.pp_train),
shuffle_buffer_size=config.shuffle_buffer_size,
prefetch=config.get("prefetch_to_host", 2),
cache=False)
# Start prefetching already.
train_iter = u.start_input_pipeline(
train_ds, config.get("prefetch_to_device", 1), pad=local_batch_size)
# We always pad to local_batch_size_eval even when less would be enough in
# order to minimize memory fragmentation.
write_note("Initializing val dataset(s)...")
def _get_val_split(dataset, split, pp_eval, data_dir=None):
# We do ceil rounding such that we include the last incomplete batch.
nval_img = input_pipeline.get_num_examples(
dataset, split, data_dir=fillin(data_dir))
val_steps = int(np.ceil(nval_img / batch_size_eval))
logging.info("Running validation for %d steps for %s, %s", val_steps,
dataset, split)
val_it = input_pipeline.get_data(
dataset=dataset,
split=split,
data_dir=fillin(data_dir),
batch_size=local_batch_size_eval,
preprocess_fn=pp_builder.get_preprocess_fn(pp_eval),
cache=config.get("val_cache", "batched"),
repeat_after_batching=True,
prefetch=0, # Save memory since we cache.
drop_remainder=False,
shuffle_files=False)
val_it = u.start_input_pipeline(
val_it, config.get("prefetch_to_device", 1), pad=local_batch_size_eval)
return (val_it, val_steps)
if isinstance(config.val_split, str):
val_ds = {"val": _get_val_split(config.dataset, config.val_split,
config.pp_eval, config.get("dataset_dir"))}
else:
val_ds = {t[0]: _get_val_split(*t[1:]) for t in config.val_split}
ntrain_img = input_pipeline.get_num_examples(
config.dataset, config.train_split,
data_dir=fillin(config.get("dataset_dir")))
steps_per_epoch = ntrain_img / batch_size
if config.get("num_epochs"):
total_steps = int(config.num_epochs * steps_per_epoch)
assert not config.get("total_steps"), "Set either num_epochs or total_steps"
else:
total_steps = config.total_steps
logging.info(
"Running for %d steps, that means %f epochs and %f steps per epoch",
total_steps, total_steps * batch_size / ntrain_img, steps_per_epoch)
mw = u.BigVisionMetricWriter(xm_xp.id, xm_wu.id, steps_per_epoch)
write_note(f"Initializing {config.model_name} model...")
model_mod = importlib.import_module(f"{BASEDIR}.models.{config.model_name}")
model = model_mod.Model(
num_classes=config.num_classes, **config.get("model", {}))
# We want all parameters to be created in host RAM, not on any device, they'll
# be sent there later as needed, otherwise we already encountered two
# situations where we allocate them twice.
@partial(jax.jit, backend="cpu")
def init(rng):
image_size = tuple(train_ds.element_spec["image"].shape[1:])
dummy_input = jnp.zeros((local_batch_size,) + image_size, jnp.float32)
params = flax.core.unfreeze(model.init(rng, dummy_input))["params"]
# Set bias in the head to a low value, such that loss is small initially.
params["head"]["bias"] = jnp.full_like(
params["head"]["bias"], config.get("init_head_bias", 0))
return params
rng, rng_init = jax.random.split(rng)
params_cpu = init(rng_init)
if jax.host_id() == 0:
num_params = sum(p.size for p in jax.tree_flatten(params_cpu)[0])
parameter_overview.log_parameter_overview(params_cpu)
mw.measure("num_params", num_params)
@partial(jax.pmap, axis_name="batch")
def evaluation_fn(params, images, labels, mask):
# Ignore the entries with all zero labels for evaluation.
mask *= labels.max(axis=1)
logits, _ = model.apply({"params": flax.core.freeze(params)}, images)
losses = getattr(u, config.get("loss", "sigmoid_xent"))(
logits=logits, labels=labels, reduction=False)
loss = jax.lax.psum(losses * mask, axis_name="batch")
top1_idx = jnp.argmax(logits, axis=1)
# Extracts the label at the highest logit index for each image.
top1_correct = jnp.take_along_axis(labels, top1_idx[:, None], axis=1)[:, 0]
ncorrect = jax.lax.psum(top1_correct * mask, axis_name="batch")
n = jax.lax.psum(mask, axis_name="batch")
return ncorrect, loss, n
# Setup function for computing representation.
@partial(jax.pmap, axis_name="batch")
def representation_fn(params, images, labels, mask):
_, outputs = model.apply({"params": flax.core.freeze(params)}, images)
representation = outputs[config.fewshot.representation_layer]
representation = jax.lax.all_gather(representation, "batch")
labels = jax.lax.all_gather(labels, "batch")
mask = jax.lax.all_gather(mask, "batch")
return representation, labels, mask
# Load the optimizer either from our folder or from flax.
opt_name = config.get("optim_name", "momentum_hp")
write_note(f"Initializing {opt_name} optimizer...")
try:
opt_mod = importlib.import_module(f"{BASEDIR}.optims.{opt_name}")
opt_def = opt_mod.Optimizer(**config.get("optim", {}))
except ModuleNotFoundError:
opt_def = getattr(flax.optim, opt_name)(**config.get("optim", {}))
# We jit this, such that the arrays that are created are created on the same
# device as the input is, in this case the CPU. Else they'd be on device[0].
opt_cpu = jax.jit(opt_def.create)(params_cpu)
@partial(jax.pmap, axis_name="batch", donate_argnums=(0,))
def update_fn(opt, lr, images, labels, rng):
"""Update step."""
measurements = {}
if config.get("mixup") and config.mixup.p:
rng, (images, labels), _ = u.mixup(rng, images, labels, **config.mixup)
# Get device-specific loss rng.
rng, rng_model = jax.random.split(rng, 2)
rng_model_local = jax.random.fold_in(rng_model, jax.lax.axis_index("batch"))
def loss_fn(params, images, labels):
logits, _ = model.apply(
{"params": flax.core.freeze(params)}, images,
train=True, rngs={"dropout": rng_model_local})
return getattr(u, config.get("loss", "sigmoid_xent"))(
logits=logits, labels=labels)
# Implementation considerations compared and summarized at
# https://docs.google.com/document/d/1g3kMEvqu1DOawaflKNyUsIoQ4yIVEoyE5ZlIPkIl4Lc/edit?hl=en#
l, g = u.accumulate_gradient(jax.value_and_grad(loss_fn), opt.target,
images, labels,
config.get("grad_accum_steps"))
l, g = jax.lax.pmean((l, g), axis_name="batch")
# Log the gradient norm only if we need to compute it anyways (clipping)
# or if we don't use grad_accum_steps, as they interact badly.
if config.get("grad_accum_steps", 1) == 1 or config.get("grad_clip_norm"):
grads, _ = jax.tree_flatten(g)
l2_g = jnp.sqrt(sum([jnp.vdot(p, p) for p in grads]))
measurements["l2_grads"] = l2_g
# Optionally resize the global gradient to a maximum norm. We found this
# useful in some cases across optimizers, hence it's in the main loop.
if config.get("grad_clip_norm"):
g_factor = jnp.minimum(1.0, config.grad_clip_norm / l2_g)
g = jax.tree_map(lambda p: g_factor * p, g)
opt = opt.apply_gradient(g, learning_rate=lr)
decay_rules = config.get("weight_decay", []) or []
if isinstance(decay_rules, numbers.Number):
decay_rules = [(".*kernel.*", decay_rules)]
sched_m = lr/config.lr.base if config.get("weight_decay_decouple") else lr
def decay_fn(v, wd):
return (1.0 - sched_m * wd) * v
opt = opt.replace(target=u.tree_map_with_regex(
decay_fn, opt.target, decay_rules, name="weight decay"))
params, _ = jax.tree_flatten(opt.target)
measurements["l2_params"] = jnp.sqrt(sum([jnp.vdot(p, p) for p in params]))
return opt, l, rng, measurements
# Other things besides optimizer state to be stored.
checkpoint_extra = dict(accum_train_time=0.0)
# Decide how to initialize training. The order is important.
# 1. Always resumes from the existing checkpoint, e.g. resumes a finetune job.
# 2. Resume from a previous checkpoint, e.g. start a cooldown training job.
# 3. Initialize model from something, e,g, start a fine-tuning job.
# 4. Train from scratch.
resume_checkpoint_path = None
if save_checkpoint_path and tf.io.gfile.exists(save_checkpoint_path):
resume_checkpoint_path = save_checkpoint_path
elif config.get("resume"):
resume_checkpoint_path = fillin(config.resume)
if resume_checkpoint_path:
write_note("Resume training from checkpoint...")
checkpoint = {"opt": opt_cpu, "extra": checkpoint_extra}
_, checkpoint_tree = jax.tree_flatten(checkpoint)
loaded = u.load_checkpoint(checkpoint_tree, resume_checkpoint_path)
# bfloat16 type gets lost when data is saved to disk, so we recover it.
checkpoint = jax.tree_map(u.recover_dtype, loaded)
opt_cpu, checkpoint_extra = checkpoint["opt"], checkpoint["extra"]
elif config.get("model_init"):
write_note(f"Initialize model from {config.model_init}...")
loaded = model_mod.load(params_cpu, config.model_init, config.get("model"))
opt_cpu = opt_cpu.replace(target=loaded)
if jax.host_id() == 0:
logging.info("Restored parameter overview:")
parameter_overview.log_parameter_overview(loaded)
write_note("Kicking off misc stuff...")
first_step = int(opt_cpu.state.step) # Might be a DeviceArray type.
chrono = u.Chrono(first_step, total_steps, batch_size,
checkpoint_extra["accum_train_time"])
# Note: switch to ProfileAllHosts() if you need to profile all hosts.
# (Xprof data become much larger and take longer to load for analysis)
profiler = periodic_actions.Profile(
# Create profile after every restart to analyze pre-emption related
# problems and assure we get similar performance in every run.
logdir=workdir, first_profile=first_step + 10)
# Prepare the learning-rate and pre-fetch it to device to avoid delays.
lr_fn = u.create_learning_rate_schedule(
batch_size, total_steps, steps_per_epoch, **config.get("lr", {}))
lr_iter = u.prefetch_scalar(map(lr_fn, range(first_step, total_steps)),
config.get("prefetch_to_device", 1))
write_note(f"Replicating...\n{chrono.note}")
opt_repl = flax_utils.replicate(opt_cpu)
write_note(f"Initializing few-shotters...\n{chrono.note}")
if "fewshot" in config:
fewshotter = fewshot.FewShotEvaluator(
representation_fn, config.fewshot,
config.fewshot.get("batch_size") or batch_size_eval)
rng, rng_loop = jax.random.split(rng, 2)
rngs_loop = flax_utils.replicate(rng_loop)
checkpoint_writer = None
write_note(f"First step compilations...\n{chrono.note}")
# Using a python integer for step here, because opt.state.step is allocated
# on TPU during replication.
for step, train_batch, lr_repl in zip(
range(first_step + 1, total_steps + 1), train_iter, lr_iter):
mw.step_start(step)
with jax.profiler.TraceContext("train_step", step_num=step, _r=1):
opt_repl, loss_value, rngs_loop, extra_measurements = update_fn(
opt_repl,
lr_repl,
train_batch["image"],
train_batch["labels"],
rng=rngs_loop)
if jax.host_id() == 0:
profiler(step)
# Checkpoint saving
if u.itstime(step, config.get("checkpoint_steps"), total_steps, host=0):
chrono.pause()
u.checkpointing_timeout(checkpoint_writer,
config.get("checkpoint_timeout", 1))
checkpoint_extra["accum_train_time"] = chrono.accum_train_time
# We need to transfer the weights over now or else we risk keeping them
# alive while they'll be updated in a future step, creating hard to debug
# memory errors (see b/160593526). Also, takes device 0's params only.
opt_cpu = jax.tree_map(lambda x: np.array(x[0]), opt_repl)
# Check whether we want to keep a copy of the current checkpoint.
copy_step = None
if u.itstime(step, config.get("keep_checkpoint_steps"), total_steps):
copy_step = step
# Checkpoint should be a nested dictionary or FLAX datataclasses from
# `flax.struct`. Both can be present in a checkpoint.
checkpoint = {"opt": opt_cpu, "extra": checkpoint_extra}
checkpoint_writer = pool.apply_async(
u.save_checkpoint, (checkpoint, save_checkpoint_path, copy_step))
chrono.resume()
# Report training progress
if u.itstime(step, config.log_training_steps, total_steps, host=0):
mw.measure("learning_rate", lr_repl[0])
mw.measure("training_loss", loss_value[0])
for name, value in extra_measurements.items():
mw.measure(name, value[0])
chrono.tick(step, mw.measure, write_note)
# Report validation performance
if u.itstime(step, config.log_eval_steps, total_steps):
chrono.pause()
for val_name, (val_iter, val_steps) in val_ds.items():
ncorrect, loss, nseen = 0, 0, 0
for _, batch in zip(range(val_steps), val_iter):
batch_ncorrect, batch_losses, batch_n = evaluation_fn(
opt_repl.target, batch["image"], batch["labels"], batch["mask"])
# All results are a replicated array shaped as follows:
# (local_devices, per_device_batch_size, elem_shape...)
# with each local device's entry being identical as they got psum'd.
# So let's just take the first one to the host as numpy.
ncorrect += np.sum(np.array(batch_ncorrect[0]))
loss += np.sum(np.array(batch_losses[0]))
nseen += np.sum(np.array(batch_n[0]))
mw.measure(f"{val_name}_prec@1", ncorrect / nseen)
mw.measure(f"{val_name}_loss", loss / nseen)
chrono.resume()
if "fewshot" in config:
# Compute few-shot on-the-fly evaluation.
if u.itstime(step, config.fewshot.log_steps, total_steps):
chrono.pause()
write_note(f"Few-shot evaluation...\n{chrono.note}")
r = fewshotter.run_all(opt_repl.target, config.fewshot.datasets)
fewshotter.walk_results(mw.measure, *r)
chrono.resume()
mw.step_end()
write_note(f"Done!\n{chrono.note}")
pool.close()
pool.join()
mw.close()
def test_train(self):
tf.enable_v2_behavior()
tf.random.set_seed(0)
np.random.seed(0)
random.seed(0)
dataset_filepattern = os.path.join(
os.path.dirname(__file__),
'tasks/robust_fill/dataset/test_dataset/program_tasks.tf_records-*'
)
print('dataset_filepattern = {}'.format(dataset_filepattern))
batch_size = 4
num_strings_per_task = 4
max_characters = 10
max_program_length = 15
# Build token tables.
id_char_table = {i + 1: char for (i, char) in enumerate(dsl.CHARACTER)}
char_id_table = {char: id for id, char in id_char_table.items()}
_, token_id_table = dsl_tokens.build_token_tables()
io_vocab_size = len(char_id_table) + 1 # For padding.
program_vocab_size = len(token_id_table) + 1
bos_token = token_id_table[dsl.BOS]
# Load dataset.
dataset = input_pipeline.create_dataset_from_tf_record(
dataset_filepattern, token_id_table, char_id_table)
dataset = dataset.padded_batch(batch_size,
padded_shapes=((num_strings_per_task,
max_characters),
(num_strings_per_task,
max_characters),
(max_program_length, )),
drop_remainder=True)
dataset_iter = dataset.repeat().as_numpy_iterator()
train_config = models.TransformerConfig(
vocab_size=io_vocab_size,
output_vocab_size=program_vocab_size,
shift=True,
emb_dim=32,
num_heads=4,
num_layers=2,
qkv_dim=32,
mlp_dim=32,
max_len=max(max_characters, max_program_length),
deterministic=False,
decode=False,
bos_token=bos_token)
eval_config = train_config.replace(deterministic=True)
rng = jax.random.PRNGKey(0)
rng, init_rng = jax.random.split(rng)
m = models.ProgramTransformer(eval_config)
initial_variables = jax.jit(m.init)(
init_rng,
jnp.ones((batch_size, num_strings_per_task, max_characters),
jnp.float32),
jnp.ones((batch_size, num_strings_per_task, max_characters),
jnp.float32),
jnp.ones((batch_size, max_program_length), jnp.float32))
optimizer_def = optim.Adam(1e-2,
beta1=0.9,
beta2=0.98,
eps=1e-9,
weight_decay=0.1)
optimizer = optimizer_def.create(initial_variables['params'])
del initial_variables # Don't keep a copy of the initial model.
optimizer = jax_utils.replicate(optimizer)
learning_rate_fn = train_lib.create_learning_rate_scheduler(
base_learning_rate=1e-2)
p_train_step = jax.pmap(functools.partial(
train_lib.train_step,
learning_rate_fn=learning_rate_fn,
config=train_config),
axis_name='batch')
p_eval_step = jax.pmap(functools.partial(train_lib.eval_step,
config=eval_config),
axis_name='batch')
# Training loop.
start_step = 0
rngs = jax.random.split(rng, jax.local_device_count())
del rng
for _ in range(start_step, 1000):
inputs, outputs, programs = common_utils.shard(next(dataset_iter))
optimizer, _, rngs = p_train_step(optimizer,
inputs,
outputs,
programs,
train_rng=rngs)
# Evaluation.
eval_metrics = []
for batches in dataset.as_numpy_iterator():
inputs, outputs, programs = common_utils.shard(batches)
metrics = p_eval_step(optimizer.target, inputs, outputs, programs)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
eval_metrics_sums = jax.tree_map(jnp.sum, eval_metrics)
eval_denominator = eval_metrics_sums.pop('denominator')
eval_summary = jax.tree_map(
lambda x: x / eval_denominator, # pylint: disable=cell-var-from-loop
eval_metrics_sums)
if jax.host_id() == 0:
self.assertGreater(eval_summary['accuracy'], 0.1)
def main():
# See all possible arguments in src/transformers/training_args.py
# or by passing the --help flag to this script.
# We now keep distinct sets of args, for a cleaner separation of concerns.
parser = HfArgumentParser((ModelArguments, DataTrainingArguments, TrainingArguments))
model_args, data_args, training_args = parser.parse_args_into_dataclasses()
configure_logger(model_args, training_args)
# Downloading and loading a dataset from the hub.
datasets = load_dataset(data_args.dataset_name, data_args.dataset_config_name, cache_dir=model_args.cache_dir)
if "validation" not in datasets.keys():
# make sure only "validation" and "train" keys remain"
datasets = DatasetDict()
datasets["validation"] = load_dataset(
data_args.dataset_name,
data_args.dataset_config_name,
split=f"{data_args.train_split_name}[:{data_args.validation_split_percentage}%]",
cache_dir=model_args.cache_dir,
)
datasets["train"] = load_dataset(
data_args.dataset_name,
data_args.dataset_config_name,
split=f"{data_args.train_split_name}[{data_args.validation_split_percentage}%:]",
cache_dir=model_args.cache_dir,
)
else:
# make sure only "validation" and "train" keys remain"
datasets = DatasetDict()
datasets["validation"] = load_dataset(
data_args.dataset_name,
data_args.dataset_config_name,
split="validation",
cache_dir=model_args.cache_dir,
)
datasets["train"] = load_dataset(
data_args.dataset_name,
data_args.dataset_config_name,
split=f"{data_args.train_split_name}",
cache_dir=model_args.cache_dir,
)
# only normalized-inputs-training is supported
feature_extractor = Wav2Vec2FeatureExtractor.from_pretrained(
model_args.model_name_or_path, cache_dir=model_args.cache_dir, do_normalize=True
)
def prepare_dataset(batch):
# check that all files have the correct sampling rate
batch["speech"], _ = librosa.load(batch[data_args.speech_file_column], sr=feature_extractor.sampling_rate)
return batch
# load audio files into numpy arrays
vectorized_datasets = datasets.map(
prepare_dataset, num_proc=data_args.preprocessing_num_workers, remove_columns=datasets["train"].column_names
)
# filter audio files that are too long
vectorized_datasets = vectorized_datasets.filter(
lambda data: len(data["speech"]) < int(data_args.max_duration_in_seconds * feature_extractor.sampling_rate)
)
def normalize(batch):
return feature_extractor(batch["speech"], sampling_rate=feature_extractor.sampling_rate)
# normalize and transform to `BatchFeatures`
vectorized_datasets = vectorized_datasets.map(
normalize,
batched=True,
num_proc=data_args.preprocessing_num_workers,
load_from_cache_file=not data_args.overwrite_cache,
remove_columns=vectorized_datasets["train"].column_names,
)
# pretraining is only supported for "newer" stable layer norm architecture
# apply_spec_augment has to be True, mask_feature_prob has to be 0.0
config = Wav2Vec2Config.from_pretrained(
model_args.model_name_or_path,
cache_dir=model_args.cache_dir,
)
if not config.do_stable_layer_norm or config.feat_extract_norm != "layer":
raise ValueError(
"PreTraining is only supported for ``config.do_stable_layer_norm=True`` and ``config.feat_extract_norm='layer'"
)
model = FlaxWav2Vec2ForPreTraining(config, seed=training_args.seed, dtype=getattr(jnp, model_args.dtype))
# Activate gradient checkpointing if needed
if training_args.gradient_checkpointing:
model.gradient_checkpointing_enable()
data_collator = FlaxDataCollatorForWav2Vec2Pretraining(
model=model, feature_extractor=feature_extractor, pad_to_multiple_of=data_args.pad_to_multiple_of
)
# Enable tensorboard only on the master node
has_tensorboard = is_tensorboard_available()
if has_tensorboard and jax.process_index() == 0:
try:
from flax.metrics.tensorboard import SummaryWriter
summary_writer = SummaryWriter(log_dir=Path(training_args.output_dir))
except ImportError as ie:
has_tensorboard = False
logger.warning(
f"Unable to display metrics through TensorBoard because some package are not installed: {ie}"
)
else:
logger.warning(
"Unable to display metrics through TensorBoard because the package is not installed: "
"Please run pip install tensorboard to enable."
)
# Initialize our training
rng = jax.random.PRNGKey(training_args.seed)
dropout_rngs = jax.random.split(rng, jax.local_device_count())
gumbel_rngs = jax.random.split(rng, jax.local_device_count())
num_epochs = int(training_args.num_train_epochs)
train_batch_size = int(training_args.per_device_train_batch_size) * jax.device_count()
eval_batch_size = int(training_args.per_device_eval_batch_size) * jax.device_count()
num_train_steps = len(vectorized_datasets["train"]) // train_batch_size * num_epochs
# Create learning rate schedule
warmup_fn = optax.linear_schedule(
init_value=0.0, end_value=training_args.learning_rate, transition_steps=training_args.warmup_steps
)
decay_fn = optax.linear_schedule(
init_value=training_args.learning_rate,
end_value=0,
transition_steps=num_train_steps - training_args.warmup_steps,
)
linear_decay_lr_schedule_fn = optax.join_schedules(
schedules=[warmup_fn, decay_fn], boundaries=[training_args.warmup_steps]
)
# We use Optax's "masking" functionality to not apply weight decay
# to bias and LayerNorm scale parameters. decay_mask_fn returns a
# mask boolean with the same structure as the parameters.
# The mask is True for parameters that should be decayed.
def decay_mask_fn(params):
flat_params = traverse_util.flatten_dict(params)
flat_mask = {
path: (path[-1] != "bias" and path[-2:] not in [("layer_norm", "scale"), ("final_layer_norm", "scale")])
for path in flat_params
}
return traverse_util.unflatten_dict(flat_mask)
# create adam optimizer
adamw = optax.adamw(
learning_rate=linear_decay_lr_schedule_fn,
b1=training_args.adam_beta1,
b2=training_args.adam_beta2,
eps=training_args.adam_epsilon,
weight_decay=training_args.weight_decay,
mask=decay_mask_fn,
)
# Setup train state and define training hyper-parameters
state = train_state.TrainState.create(apply_fn=model.__call__, params=model.params, tx=adamw)
num_negatives = model.config.num_negatives
contrastive_logits_temperature = model.config.contrastive_logits_temperature
num_codevectors = model.config.num_codevectors_per_group * model.config.num_codevector_groups
diversity_loss_weight = model.config.diversity_loss_weight
# Define gradient update step fn
def train_step(state, batch, dropout_rng, gumbel_rng):
dropout_rng, new_dropout_rng = jax.random.split(dropout_rng)
gumbel_rng, new_gumbel_rng = jax.random.split(gumbel_rng)
def loss_fn(params):
negative_indices = batch.pop("sampled_negative_indices")
gumbel_temperature = jnp.clip(
model_args.max_gumbel_temperature * model_args.gumbel_temperature_decay ** state.step,
a_min=model_args.min_gumbel_temperature,
)
outputs = state.apply_fn(
**batch,
gumbel_temperature=gumbel_temperature,
params=params,
dropout_rng=dropout_rng,
gumbel_rng=gumbel_rng,
train=True,
)
contrastive_loss = compute_contrastive_loss(
outputs.projected_quantized_states,
outputs.projected_states,
negative_indices,
batch["mask_time_indices"],
contrastive_logits_temperature,
num_negatives,
)
diversity_loss = (num_codevectors - outputs.codevector_perplexity) / num_codevectors
loss = contrastive_loss + diversity_loss_weight * diversity_loss
return loss
grad_fn = jax.value_and_grad(loss_fn)
loss, grad = grad_fn(state.params)
grad = jax.lax.pmean(grad, "batch")
new_state = state.apply_gradients(grads=grad)
metrics = jax.lax.pmean(
{"loss": loss, "learning_rate": linear_decay_lr_schedule_fn(state.step)}, axis_name="batch"
)
return new_state, metrics, new_dropout_rng, new_gumbel_rng
# Create parallel version of the train step
p_train_step = jax.pmap(train_step, "batch", donate_argnums=(0,))
# Define eval fn
def eval_step(params, batch):
negative_indices = batch.pop("sampled_negative_indices")
outputs = model(**batch, params=params, train=False)
contrastive_loss = compute_contrastive_loss(
outputs.projected_quantized_states,
outputs.projected_states,
negative_indices,
batch["mask_time_indices"],
contrastive_logits_temperature,
num_negatives,
)
diversity_loss = (num_codevectors - outputs.codevector_perplexity) / num_codevectors
loss = contrastive_loss + diversity_loss_weight * diversity_loss
# summarize metrics
metrics = {"loss": loss.mean(), "codevector_perplexity": outputs.codevector_perplexity}
metrics = jax.lax.pmean(metrics, axis_name="batch")
return metrics
p_eval_step = jax.pmap(eval_step, "batch", donate_argnums=(0,))
# Replicate the train state on each device
state = jax_utils.replicate(state)
train_time = 0
train_metrics = []
epochs = tqdm(range(num_epochs), desc=f"Epoch ... (1/{num_epochs})", position=0)
for epoch in epochs:
# ======================== Training ================================
train_start = time.time()
# Create sampling rng
rng, input_rng = jax.random.split(rng)
# Generate an epoch by shuffling sampling indices from the train dataset
num_train_samples = len(vectorized_datasets["train"])
train_samples_idx = jax.random.permutation(input_rng, jnp.arange(num_train_samples))
train_batch_idx = generate_batch_splits(train_samples_idx, train_batch_size)
# Gather the indexes for creating the batch and do a training step
for step, batch_idx in enumerate(tqdm(train_batch_idx, desc="Training...", position=1)):
samples = [vectorized_datasets["train"][int(idx)] for idx in batch_idx]
model_inputs = data_collator(samples)
model_inputs = shard(model_inputs.data)
# Model forward
state, train_metric, dropout_rngs, gumbel_rngs = p_train_step(
state, model_inputs, dropout_rngs, gumbel_rngs
)
train_metrics.append(train_metric)
cur_step = epoch * (num_train_samples // train_batch_size) + step
if cur_step % training_args.logging_steps == 0 and cur_step > 0:
# Save metrics
train_metric = jax_utils.unreplicate(train_metric)
train_time += time.time() - train_start
if has_tensorboard and jax.process_index() == 0:
write_train_metric(summary_writer, train_metrics, train_time, cur_step)
epochs.write(
f"Step... ({cur_step} | Loss: {train_metric['loss'].mean()}, Learning Rate: {train_metric['learning_rate'].mean()})"
)
train_metrics = []
# ======================== Evaluating ==============================
num_eval_samples = len(vectorized_datasets["validation"])
eval_samples_idx = jnp.arange(num_eval_samples)
eval_batch_idx = generate_batch_splits(eval_samples_idx, eval_batch_size)
eval_metrics = []
for i, batch_idx in enumerate(tqdm(eval_batch_idx, desc="Evaluating ...", position=2)):
samples = [vectorized_datasets["validation"][int(idx)] for idx in batch_idx]
model_inputs = data_collator(samples)
# Model forward
model_inputs = shard(model_inputs.data)
metrics = p_eval_step(state.params, model_inputs)
eval_metrics.append(metrics)
# get eval metrics
eval_metrics = get_metrics(eval_metrics)
eval_metrics = jax.tree_map(jnp.mean, eval_metrics)
# Update progress bar
epochs.write(
f"Epoch... ({epoch + 1}/{num_epochs} | Loss: {eval_metrics['loss']}, Perplexity: {eval_metrics['codevector_perplexity']})"
)
# Save metrics
if has_tensorboard and jax.process_index() == 0:
cur_step = epoch * (len(vectorized_datasets["train"]) // train_batch_size)
write_eval_metric(summary_writer, eval_metrics, cur_step)
# save checkpoint after each epoch and push checkpoint to the hub
if jax.process_index() == 0:
params = jax.device_get(jax.tree_map(lambda x: x[0], state.params))
model.save_pretrained(training_args.output_dir, params=params, push_to_hub=training_args.push_to_hub)
def train_and_evaluate(config: ml_collections.ConfigDict, workdir: str):
"""Runs a training and evaluation loop.
Args:
config: Configuration to use.
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
"""
tf.io.gfile.makedirs(workdir)
batch_size = config.batch_size
n_devices = jax.device_count()
if jax.process_count() > 1:
raise ValueError(
'PixelCNN++ example should not be run on more than 1 host'
' (for now)')
if batch_size % n_devices > 0:
raise ValueError(
'Batch size must be divisible by the number of devices')
train_summary_writer, eval_summary_writer = get_summary_writers(workdir)
# Load dataset
data_source = input_pipeline.DataSource(config)
train_ds = data_source.train_ds
eval_ds = data_source.eval_ds
steps_per_epoch = data_source.ds_info.splits[
'train'].num_examples // config.batch_size
# Create dataset batch iterators
train_iter = iter(train_ds)
num_train_steps = train_ds.cardinality().numpy()
steps_per_checkpoint = 1000
# Create the model using data-dependent initialization. Don't shard the init
# batch.
assert config.init_batch_size <= batch_size
init_batch = next(train_iter)['image']._numpy()[:config.init_batch_size]
rng = jax.random.PRNGKey(config.seed)
rng, init_rng, dropout_rng = jax.random.split(rng, 3)
initial_variables = model(config).init(
{
'params': init_rng,
'dropout': dropout_rng
}, init_batch, train=False)['params']
optimizer_def = optim.Adam(beta1=0.95, beta2=0.9995)
optimizer = optimizer_def.create(initial_variables)
optimizer, ema = restore_checkpoint(workdir, optimizer, initial_variables)
ema = initial_variables
step_offset = int(optimizer.state.step)
optimizer, ema = jax_utils.replicate((optimizer, ema))
# Learning rate schedule
learning_rate_fn = lambda step: config.learning_rate * config.lr_decay**step
# pmap the train and eval functions
p_train_step = jax.pmap(functools.partial(train_step, config,
learning_rate_fn),
axis_name='batch')
p_eval_step = jax.pmap(functools.partial(eval_step, config=config),
axis_name='batch')
# Gather metrics
train_metrics = []
for step, batch in zip(range(step_offset, num_train_steps), train_iter):
# Load and shard the TF batch
batch = load_and_shard_tf_batch(batch)
# Generate a PRNG key that will be rolled into the batch.
rng, step_rng = jax.random.split(rng)
sharded_rngs = common_utils.shard_prng_key(step_rng)
# Train step
optimizer, ema, metrics = p_train_step(optimizer, ema, batch,
sharded_rngs)
train_metrics.append(metrics)
# Quick indication that training is happening.
logging.log_first_n(logging.INFO, 'Finished training step %d.', 5,
step)
if (step + 1) % steps_per_epoch == 0:
epoch = step // steps_per_epoch
# We've finished an epoch
train_metrics = common_utils.get_metrics(train_metrics)
# Get training epoch summary for logging
train_summary = jax.tree_map(lambda x: x.mean(), train_metrics)
# Send stats to Tensorboard
for key, vals in train_metrics.items():
for i, val in enumerate(vals):
train_summary_writer.scalar(key, val,
step - len(vals) + i + 1)
# Reset train metrics
train_metrics = []
# Evaluation
eval_metrics = []
for eval_batch in eval_ds:
# Load and shard the TF batch
eval_batch = load_and_shard_tf_batch(eval_batch)
# Step
metrics = p_eval_step(ema, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
# Get eval epoch summary for logging
eval_summary = jax.tree_map(lambda x: x.mean(), eval_metrics)
# Log epoch summary
logging.info('Epoch %d: TRAIN loss=%.6f, EVAL loss=%.6f', epoch,
train_summary['loss'], eval_summary['loss'])
eval_summary_writer.scalar('loss', eval_summary['loss'], step)
train_summary_writer.flush()
eval_summary_writer.flush()
if (step +
1) % steps_per_checkpoint == 0 or step + 1 == num_train_steps:
save_checkpoint(workdir, optimizer, ema, step)
def main(unused_argv):
rng = random.PRNGKey(20200823)
# Shift the numpy random seed by host_id() to shuffle data loaded by different
# hosts.
np.random.seed(20201473 + jax.host_id())
if FLAGS.config is not None:
utils.update_flags(FLAGS)
if FLAGS.batch_size % jax.device_count() != 0:
raise ValueError(
"Batch size must be divisible by the number of devices.")
if FLAGS.train_dir is None:
raise ValueError("train_dir must be set. None set now.")
if FLAGS.data_dir is None:
raise ValueError("data_dir must be set. None set now.")
dataset = datasets.get_dataset("train", FLAGS)
test_dataset = datasets.get_dataset("test", FLAGS)
test_render_fn = jax.pmap(
# Note rng_keys are useless in eval mode since there's no randomness.
# pylint: disable=g-long-lambda
lambda key_0, key_1, model, rays: jax.lax.all_gather(
model(key_0, key_1, rays.origins, rays.directions, rays.viewdirs),
axis_name="batch"),
in_axes=(None, None, None, 0), # Only distribute the data input.
donate_argnums=3,
axis_name="batch",
)
rng, key = random.split(rng)
init_model, init_state = models.get_model(key, dataset.peek(), FLAGS)
optimizer_def = optim.Adam(FLAGS.lr)
optimizer = optimizer_def.create(init_model)
state = model_utils.TrainState(step=0,
optimizer=optimizer,
model_state=init_state)
if not utils.isdir(FLAGS.train_dir):
utils.makedirs(FLAGS.train_dir)
state = checkpoints.restore_checkpoint(FLAGS.train_dir, state)
offset = state.step + 1
state = jax_utils.replicate(state)
del init_model, init_state
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(FLAGS.train_dir)
t_loop_start = time.time()
learning_rate_fn = functools.partial(utils.learning_rate_decay,
init_lr=FLAGS.lr,
decay_steps=FLAGS.lr_decay * 1000,
decay_rate=0.1)
ptrain_step = jax.pmap(train_step,
axis_name="batch",
in_axes=(0, 0, 0, None),
donate_argnums=2)
# Prefetch_buffer_size = 3 x batch_size
pdataset = jax_utils.prefetch_to_device(dataset, 3)
n_local_deices = jax.local_device_count()
rng = rng + jax.host_id() # Make random seed separate across hosts.
keys = random.split(rng, n_local_deices) # For pmapping RNG keys.
gc.disable() # Disable automatic garbage collection for efficiency.
for step, batch in zip(range(offset, FLAGS.max_steps + 1), pdataset):
lr = learning_rate_fn(step)
state, stats, keys = ptrain_step(keys, state, batch, lr)
if step % FLAGS.gc_every == 0:
gc.collect()
# --- Train logs start ---
# Put the training time visualization before the host_id check as in
# multi-host evaluation, all hosts need to run inference even though we
# only use host 0 to record results.
if FLAGS.render_every > 0 and step % FLAGS.render_every == 0:
# We reuse the same random number generator from the optimization step
# here on purpose so that the visualization matches what happened in
# training.
state_to_eval = jax.device_get(jax.tree_map(lambda x: x[0], state))
test_case = next(test_dataset)
pred_color, pred_disp, pred_acc = utils.render_image(
state_to_eval,
test_case["rays"],
test_render_fn,
keys[0],
FLAGS.dataset == "llff",
chunk=FLAGS.chunk)
if jax.host_id() == 0:
summary_writer.image("pred_color", pred_color, step)
summary_writer.image("pred_disp", pred_disp, step)
summary_writer.image("pred_acc", pred_acc, step)
summary_writer.image("target", test_case["pixels"], step)
if jax.host_id() != 0: # Only log via host 0.
continue
if step % FLAGS.print_every == 0:
steps_per_sec = FLAGS.print_every / (time.time() - t_loop_start)
t_loop_start = time.time()
rays_per_sec = FLAGS.batch_size * steps_per_sec
summary_writer.scalar("loss", stats[0].loss[0], step)
summary_writer.scalar("psnr", stats[0].psnr[0], step)
summary_writer.scalar("learning_rate", lr, step)
if len(stats) > 1:
summary_writer.scalar("loss_coarse", stats[1].loss[0], step)
summary_writer.scalar("psnr_coarse", stats[1].psnr[0], step)
summary_writer.scalar("steps_per_sec", steps_per_sec, step)
summary_writer.scalar("rays_per_sec", rays_per_sec, step)
precision = int(np.ceil(np.log10(FLAGS.max_steps))) + 1
print(("{:" + "{:d}".format(precision) + "d}").format(step) +
f"/{FLAGS.max_steps:d}: " +
f"loss={stats[0].loss[0]:0.5f}, " +
f"{rays_per_sec:0.3f} rays/sec")
if step % FLAGS.save_every == 0:
state_to_save = jax.device_get(jax.tree_map(lambda x: x[0], state))
checkpoints.save_checkpoint(FLAGS.train_dir,
state_to_save,
state_to_save.step,
keep=100)
# --- Train logs end ---
if FLAGS.max_steps % FLAGS.save_every != 0:
state = jax.device_get(jax.tree_map(lambda x: x[0], state))
checkpoints.save_checkpoint(FLAGS.train_dir,
state,
int(state.step),
keep=100)
def train_and_evaluate(config: ml_collections.ConfigDict, workdir: str):
"""Execute model training and evaluation loop.
Args:
config: Hyperparameter configuration for training and evaluation.
workdir: Directory where the tensorboard summaries are written to.
"""
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(workdir)
summary_writer.hparams(dict(config))
rng = random.PRNGKey(0)
image_size = 224
if config.batch_size % jax.device_count() > 0:
raise ValueError(
'Batch size must be divisible by the number of devices')
local_batch_size = config.batch_size // jax.host_count()
platform = jax.local_devices()[0].platform
if config.half_precision:
if platform == 'tpu':
input_dtype = tf.bfloat16
else:
input_dtype = tf.float16
else:
input_dtype = tf.float32
dataset_builder = tfds.builder('imagenet2012:5.*.*')
train_iter = create_input_iter(dataset_builder,
local_batch_size,
image_size,
input_dtype,
train=True,
cache=config.cache)
eval_iter = create_input_iter(dataset_builder,
local_batch_size,
image_size,
input_dtype,
train=False,
cache=config.cache)
steps_per_epoch = (dataset_builder.info.splits['train'].num_examples //
config.batch_size)
if config.num_train_steps == -1:
num_steps = steps_per_epoch * config.num_epochs
else:
num_steps = config.num_train_steps
if config.steps_per_eval == -1:
num_validation_examples = dataset_builder.info.splits[
'validation'].num_examples
steps_per_eval = num_validation_examples // config.batch_size
else:
steps_per_eval = config.steps_per_eval
steps_per_checkpoint = steps_per_epoch * 10
base_learning_rate = config.learning_rate * config.batch_size / 256.
model_cls = getattr(models, config.model)
model = create_model(model_cls=model_cls,
half_precision=config.half_precision)
state = create_train_state(rng, config, model, image_size)
state = restore_checkpoint(state, workdir)
# step_offset > 0 if restarting from checkpoint
step_offset = int(state.step)
state = jax_utils.replicate(state)
learning_rate_fn = create_learning_rate_fn(base_learning_rate,
steps_per_epoch,
config.num_epochs)
p_train_step = jax.pmap(functools.partial(
train_step, model.apply, learning_rate_fn=learning_rate_fn),
axis_name='batch')
p_eval_step = jax.pmap(functools.partial(eval_step, model.apply),
axis_name='batch')
epoch_metrics = []
t_loop_start = time.time()
logging.info('Initial compilation, this might take some minutes...')
for step, batch in zip(range(step_offset, num_steps), train_iter):
state, metrics = p_train_step(state, batch)
epoch_metrics.append(metrics)
if (step + 1) % steps_per_epoch == 0:
epoch = step // steps_per_epoch
epoch_metrics = common_utils.get_metrics(epoch_metrics)
summary = jax.tree_map(lambda x: x.mean(), epoch_metrics)
logging.info('train epoch: %d, loss: %.4f, accuracy: %.2f', epoch,
summary['loss'], summary['accuracy'] * 100)
steps_per_sec = steps_per_epoch / (time.time() - t_loop_start)
t_loop_start = time.time()
if jax.host_id() == 0:
for key, vals in epoch_metrics.items():
tag = 'train_%s' % key
for i, val in enumerate(vals):
summary_writer.scalar(tag, val,
step - len(vals) + i + 1)
summary_writer.scalar('steps per second', steps_per_sec, step)
epoch_metrics = []
eval_metrics = []
# sync batch statistics across replicas
state = sync_batch_stats(state)
for _ in range(steps_per_eval):
eval_batch = next(eval_iter)
metrics = p_eval_step(state, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
summary = jax.tree_map(lambda x: x.mean(), eval_metrics)
logging.info('eval epoch: %d, loss: %.4f, accuracy: %.2f', epoch,
summary['loss'], summary['accuracy'] * 100)
if jax.host_id() == 0:
for key, val in eval_metrics.items():
tag = 'eval_%s' % key
summary_writer.scalar(tag, val.mean(), step)
summary_writer.flush()
if (step + 1) % steps_per_checkpoint == 0 or step + 1 == num_steps:
state = sync_batch_stats(state)
save_checkpoint(state, workdir)
# Wait until computations are done before exiting
jax.random.normal(jax.random.PRNGKey(0), ()).block_until_ready()
def main():
args = parse_args()
# Make one log on every process with the configuration for debugging.
logging.basicConfig(
format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
level=logging.INFO,
)
# Setup logging, we only want one process per machine to log things on the screen.
logger.setLevel(logging.INFO if jax.process_index() ==
0 else logging.ERROR)
if jax.process_index() == 0:
datasets.utils.logging.set_verbosity_warning()
transformers.utils.logging.set_verbosity_info()
else:
datasets.utils.logging.set_verbosity_error()
transformers.utils.logging.set_verbosity_error()
# Get the datasets: you can either provide your own CSV/JSON training and evaluation files (see below)
# or specify a GLUE benchmark task (the dataset will be downloaded automatically from the datasets Hub).
# For CSV/JSON files, this script will use as labels the column called 'label' and as pair of sentences the
# sentences in columns called 'sentence1' and 'sentence2' if such column exists or the first two columns not named
# label if at least two columns are provided.
# If the CSVs/JSONs contain only one non-label column, the script does single sentence classification on this
# single column. You can easily tweak this behavior (see below)
# In distributed training, the load_dataset function guarantee that only one local process can concurrently
# download the dataset.
if args.task_name is not None:
# Downloading and loading a dataset from the hub.
raw_datasets = load_dataset("glue", args.task_name)
else:
# Loading the dataset from local csv or json file.
data_files = {}
if args.train_file is not None:
data_files["train"] = args.train_file
if args.validation_file is not None:
data_files["validation"] = args.validation_file
extension = (args.train_file if args.train_file is not None else
args.valid_file).split(".")[-1]
raw_datasets = load_dataset(extension, data_files=data_files)
# See more about loading any type of standard or custom dataset at
# https://huggingface.co/docs/datasets/loading_datasets.html.
# Labels
if args.task_name is not None:
is_regression = args.task_name == "stsb"
if not is_regression:
label_list = raw_datasets["train"].features["label"].names
num_labels = len(label_list)
else:
num_labels = 1
else:
# Trying to have good defaults here, don't hesitate to tweak to your needs.
is_regression = raw_datasets["train"].features["label"].dtype in [
"float32", "float64"
]
if is_regression:
num_labels = 1
else:
# A useful fast method:
# https://huggingface.co/docs/datasets/package_reference/main_classes.html#datasets.Dataset.unique
label_list = raw_datasets["train"].unique("label")
label_list.sort() # Let's sort it for determinism
num_labels = len(label_list)
# Load pretrained model and tokenizer
config = AutoConfig.from_pretrained(args.model_name_or_path,
num_labels=num_labels,
finetuning_task=args.task_name)
tokenizer = AutoTokenizer.from_pretrained(
args.model_name_or_path, use_fast=not args.use_slow_tokenizer)
model = FlaxAutoModelForSequenceClassification.from_pretrained(
args.model_name_or_path, config=config)
# Preprocessing the datasets
if args.task_name is not None:
sentence1_key, sentence2_key = task_to_keys[args.task_name]
else:
# Again, we try to have some nice defaults but don't hesitate to tweak to your use case.
non_label_column_names = [
name for name in raw_datasets["train"].column_names
if name != "label"
]
if "sentence1" in non_label_column_names and "sentence2" in non_label_column_names:
sentence1_key, sentence2_key = "sentence1", "sentence2"
else:
if len(non_label_column_names) >= 2:
sentence1_key, sentence2_key = non_label_column_names[:2]
else:
sentence1_key, sentence2_key = non_label_column_names[0], None
# Some models have set the order of the labels to use, so let's make sure we do use it.
label_to_id = None
if (model.config.label2id !=
PretrainedConfig(num_labels=num_labels).label2id
and args.task_name is not None and not is_regression):
# Some have all caps in their config, some don't.
label_name_to_id = {
k.lower(): v
for k, v in model.config.label2id.items()
}
if list(sorted(label_name_to_id.keys())) == list(sorted(label_list)):
logger.info(
f"The configuration of the model provided the following label correspondence: {label_name_to_id}. "
"Using it!")
label_to_id = {
i: label_name_to_id[label_list[i]]
for i in range(num_labels)
}
else:
logger.warning(
"Your model seems to have been trained with labels, but they don't match the dataset: ",
f"model labels: {list(sorted(label_name_to_id.keys()))}, dataset labels: {list(sorted(label_list))}."
"\nIgnoring the model labels as a result.",
)
elif args.task_name is None:
label_to_id = {v: i for i, v in enumerate(label_list)}
def preprocess_function(examples):
# Tokenize the texts
texts = ((examples[sentence1_key], ) if sentence2_key is None else
(examples[sentence1_key], examples[sentence2_key]))
result = tokenizer(*texts,
padding="max_length",
max_length=args.max_length,
truncation=True)
if "label" in examples:
if label_to_id is not None:
# Map labels to IDs (not necessary for GLUE tasks)
result["labels"] = [label_to_id[l] for l in examples["label"]]
else:
# In all cases, rename the column to labels because the model will expect that.
result["labels"] = examples["label"]
return result
processed_datasets = raw_datasets.map(
preprocess_function,
batched=True,
remove_columns=raw_datasets["train"].column_names)
train_dataset = processed_datasets["train"]
eval_dataset = processed_datasets["validation_matched" if args.task_name ==
"mnli" else "validation"]
# Log a few random samples from the training set:
for index in random.sample(range(len(train_dataset)), 3):
logger.info(
f"Sample {index} of the training set: {train_dataset[index]}.")
# Define a summary writer
summary_writer = tensorboard.SummaryWriter(args.output_dir)
summary_writer.hparams(vars(args))
def write_metric(train_metrics, eval_metrics, train_time, step):
summary_writer.scalar("train_time", train_time, step)
train_metrics = get_metrics(train_metrics)
for key, vals in train_metrics.items():
tag = f"train_{key}"
for i, val in enumerate(vals):
summary_writer.scalar(tag, val, step - len(vals) + i + 1)
for metric_name, value in eval_metrics.items():
summary_writer.scalar(f"eval_{metric_name}", value, step)
num_epochs = int(args.num_train_epochs)
rng = jax.random.PRNGKey(args.seed)
dropout_rngs = jax.random.split(rng, jax.local_device_count())
train_batch_size = args.per_device_train_batch_size * jax.local_device_count(
)
eval_batch_size = args.per_device_eval_batch_size * jax.local_device_count(
)
learning_rate_fn = create_learning_rate_fn(len(train_dataset),
train_batch_size,
args.num_train_epochs,
args.num_warmup_steps,
args.learning_rate)
state = create_train_state(model,
learning_rate_fn,
is_regression,
num_labels=num_labels,
weight_decay=args.weight_decay)
# define step functions
def train_step(
state: train_state.TrainState, batch: Dict[str, Array],
dropout_rng: PRNGKey) -> Tuple[train_state.TrainState, float]:
"""Trains model with an optimizer (both in `state`) on `batch`, returning a pair `(new_state, loss)`."""
dropout_rng, new_dropout_rng = jax.random.split(dropout_rng)
targets = batch.pop("labels")
def loss_fn(params):
logits = state.apply_fn(**batch,
params=params,
dropout_rng=dropout_rng,
train=True)[0]
loss = state.loss_fn(logits, targets)
return loss
grad_fn = jax.value_and_grad(loss_fn)
loss, grad = grad_fn(state.params)
grad = jax.lax.pmean(grad, "batch")
new_state = state.apply_gradients(grads=grad)
metrics = jax.lax.pmean(
{
"loss": loss,
"learning_rate": learning_rate_fn(state.step)
},
axis_name="batch")
return new_state, metrics, new_dropout_rng
p_train_step = jax.pmap(train_step,
axis_name="batch",
donate_argnums=(0, ))
def eval_step(state, batch):
logits = state.apply_fn(**batch, params=state.params, train=False)[0]
return state.logits_fn(logits)
p_eval_step = jax.pmap(eval_step, axis_name="batch")
if args.task_name is not None:
metric = load_metric("glue", args.task_name)
else:
metric = load_metric("accuracy")
logger.info(f"===== Starting training ({num_epochs} epochs) =====")
train_time = 0
# make sure weights are replicated on each device
state = replicate(state)
for epoch in range(1, num_epochs + 1):
logger.info(f"Epoch {epoch}")
logger.info(" Training...")
train_start = time.time()
train_metrics = []
rng, input_rng = jax.random.split(rng)
# train
for batch in glue_train_data_collator(input_rng, train_dataset,
train_batch_size):
state, metrics, dropout_rngs = p_train_step(
state, batch, dropout_rngs)
train_metrics.append(metrics)
train_time += time.time() - train_start
logger.info(f" Done! Training metrics: {unreplicate(metrics)}")
logger.info(" Evaluating...")
# evaluate
for batch in glue_eval_data_collator(eval_dataset, eval_batch_size):
labels = batch.pop("labels")
predictions = p_eval_step(state, batch)
metric.add_batch(predictions=chain(*predictions),
references=chain(*labels))
# evaluate also on leftover examples (not divisible by batch_size)
num_leftover_samples = len(eval_dataset) % eval_batch_size
# make sure leftover batch is evaluated on one device
if num_leftover_samples > 0 and jax.process_index() == 0:
# take leftover samples
batch = eval_dataset[-num_leftover_samples:]
batch = {k: jnp.array(v) for k, v in batch.items()}
labels = batch.pop("labels")
predictions = eval_step(unreplicate(state), batch)
metric.add_batch(predictions=predictions, references=labels)
eval_metric = metric.compute()
logger.info(f" Done! Eval metrics: {eval_metric}")
cur_step = epoch * (len(train_dataset) // train_batch_size)
write_metric(train_metrics, eval_metric, train_time, cur_step)
# save last checkpoint
if jax.process_index() == 0:
params = jax.device_get(jax.tree_map(lambda x: x[0], state.params))
model.save_pretrained(args.output_dir, params=params)
def main():
# region Argument parsing
# See all possible arguments in src/transformers/training_args.py
# or by passing the --help flag to this script.
# We now keep distinct sets of args, for a cleaner separation of concerns.
parser = HfArgumentParser(
(ModelArguments, DataTrainingArguments, TrainingArguments))
if len(sys.argv) == 2 and sys.argv[1].endswith(".json"):
# If we pass only one argument to the script and it's the path to a json file,
# let's parse it to get our arguments.
model_args, data_args, training_args = parser.parse_json_file(
json_file=os.path.abspath(sys.argv[1]))
else:
model_args, data_args, training_args = parser.parse_args_into_dataclasses(
)
# endregion
# region Logging
# Make one log on every process with the configuration for debugging.
logging.basicConfig(
format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
level=logging.INFO,
)
# Setup logging, we only want one process per machine to log things on the screen.
logger.setLevel(logging.INFO if jax.process_index() ==
0 else logging.ERROR)
if jax.process_index() == 0:
datasets.utils.logging.set_verbosity_warning()
transformers.utils.logging.set_verbosity_info()
else:
datasets.utils.logging.set_verbosity_error()
transformers.utils.logging.set_verbosity_error()
# endregion
# Handle the repository creation
if training_args.push_to_hub:
if training_args.hub_model_id is None:
repo_name = get_full_repo_name(Path(
training_args.output_dir).absolute().name,
token=training_args.hub_token)
else:
repo_name = training_args.hub_model_id
repo = Repository(training_args.output_dir, clone_from=repo_name)
# region Load Data
# Get the datasets: you can either provide your own CSV/JSON/TXT training and evaluation files (see below)
# or just provide the name of one of the public datasets available on the hub at https://huggingface.co/datasets/
# (the dataset will be downloaded automatically from the datasets Hub).
#
# For CSV/JSON files, this script will use the column called 'text' or the first column if no column called
# 'text' is found. You can easily tweak this behavior (see below).
#
# In distributed training, the load_dataset function guarantee that only one local process can concurrently
# download the dataset.
if data_args.dataset_name is not None:
# Downloading and loading a dataset from the hub.
raw_datasets = load_dataset(data_args.dataset_name,
data_args.dataset_config_name,
cache_dir=model_args.cache_dir)
else:
# Loading the dataset from local csv or json file.
data_files = {}
if data_args.train_file is not None:
data_files["train"] = data_args.train_file
extension = data_args.train_file.split(".")[-1]
if data_args.validation_file is not None:
data_files["validation"] = data_args.validation_file
extension = data_args.validation_file.split(".")[-1]
if data_args.test_file is not None:
data_files["test"] = data_args.test_file
extension = data_args.test_file.split(".")[-1]
raw_datasets = load_dataset(extension,
data_files=data_files,
field="data",
cache_dir=model_args.cache_dir)
# See more about loading any type of standard or custom dataset (from files, python dict, pandas DataFrame, etc) at
# https://huggingface.co/docs/datasets/loading_datasets.html.
# endregion
# region Load pretrained model and tokenizer
#
# Load pretrained model and tokenizer
config = AutoConfig.from_pretrained(
model_args.config_name
if model_args.config_name else model_args.model_name_or_path,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
)
tokenizer = AutoTokenizer.from_pretrained(
model_args.tokenizer_name
if model_args.tokenizer_name else model_args.model_name_or_path,
cache_dir=model_args.cache_dir,
use_fast=True,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
)
# endregion
# region Tokenizer check: this script requires a fast tokenizer.
if not isinstance(tokenizer, PreTrainedTokenizerFast):
raise ValueError(
"This example script only works for models that have a fast tokenizer. Checkout the big table of models "
"at https://huggingface.co/transformers/index.html#supported-frameworks to find the model types that meet this "
"requirement")
# endregion
# region Preprocessing the datasets
# Preprocessing is slightly different for training and evaluation.
if training_args.do_train:
column_names = raw_datasets["train"].column_names
elif training_args.do_eval:
column_names = raw_datasets["validation"].column_names
else:
column_names = raw_datasets["test"].column_names
question_column_name = "question" if "question" in column_names else column_names[
0]
context_column_name = "context" if "context" in column_names else column_names[
1]
answer_column_name = "answers" if "answers" in column_names else column_names[
2]
# Padding side determines if we do (question|context) or (context|question).
pad_on_right = tokenizer.padding_side == "right"
if data_args.max_seq_length > tokenizer.model_max_length:
logger.warning(
f"The max_seq_length passed ({data_args.max_seq_length}) is larger than the maximum length for the"
f"model ({tokenizer.model_max_length}). Using max_seq_length={tokenizer.model_max_length}."
)
max_seq_length = min(data_args.max_seq_length, tokenizer.model_max_length)
# Training preprocessing
def prepare_train_features(examples):
# Some of the questions have lots of whitespace on the left, which is not useful and will make the
# truncation of the context fail (the tokenized question will take a lots of space). So we remove that
# left whitespace
examples[question_column_name] = [
q.lstrip() for q in examples[question_column_name]
]
# Tokenize our examples with truncation and maybe padding, but keep the overflows using a stride. This results
# in one example possible giving several features when a context is long, each of those features having a
# context that overlaps a bit the context of the previous feature.
tokenized_examples = tokenizer(
examples[
question_column_name if pad_on_right else context_column_name],
examples[
context_column_name if pad_on_right else question_column_name],
truncation="only_second" if pad_on_right else "only_first",
max_length=max_seq_length,
stride=data_args.doc_stride,
return_overflowing_tokens=True,
return_offsets_mapping=True,
padding="max_length",
)
# Since one example might give us several features if it has a long context, we need a map from a feature to
# its corresponding example. This key gives us just that.
sample_mapping = tokenized_examples.pop("overflow_to_sample_mapping")
# The offset mappings will give us a map from token to character position in the original context. This will
# help us compute the start_positions and end_positions.
offset_mapping = tokenized_examples.pop("offset_mapping")
# Let's label those examples!
tokenized_examples["start_positions"] = []
tokenized_examples["end_positions"] = []
for i, offsets in enumerate(offset_mapping):
# We will label impossible answers with the index of the CLS token.
input_ids = tokenized_examples["input_ids"][i]
cls_index = input_ids.index(tokenizer.cls_token_id)
# Grab the sequence corresponding to that example (to know what is the context and what is the question).
sequence_ids = tokenized_examples.sequence_ids(i)
# One example can give several spans, this is the index of the example containing this span of text.
sample_index = sample_mapping[i]
answers = examples[answer_column_name][sample_index]
# If no answers are given, set the cls_index as answer.
if len(answers["answer_start"]) == 0:
tokenized_examples["start_positions"].append(cls_index)
tokenized_examples["end_positions"].append(cls_index)
else:
# Start/end character index of the answer in the text.
start_char = answers["answer_start"][0]
end_char = start_char + len(answers["text"][0])
# Start token index of the current span in the text.
token_start_index = 0
while sequence_ids[token_start_index] != (1 if pad_on_right
else 0):
token_start_index += 1
# End token index of the current span in the text.
token_end_index = len(input_ids) - 1
while sequence_ids[token_end_index] != (1 if pad_on_right else
0):
token_end_index -= 1
# Detect if the answer is out of the span (in which case this feature is labeled with the CLS index).
if not (offsets[token_start_index][0] <= start_char
and offsets[token_end_index][1] >= end_char):
tokenized_examples["start_positions"].append(cls_index)
tokenized_examples["end_positions"].append(cls_index)
else:
# Otherwise move the token_start_index and token_end_index to the two ends of the answer.
# Note: we could go after the last offset if the answer is the last word (edge case).
while token_start_index < len(offsets) and offsets[
token_start_index][0] <= start_char:
token_start_index += 1
tokenized_examples["start_positions"].append(
token_start_index - 1)
while offsets[token_end_index][1] >= end_char:
token_end_index -= 1
tokenized_examples["end_positions"].append(
token_end_index + 1)
return tokenized_examples
processed_raw_datasets = dict()
if training_args.do_train:
if "train" not in raw_datasets:
raise ValueError("--do_train requires a train dataset")
train_dataset = raw_datasets["train"]
if data_args.max_train_samples is not None:
# We will select sample from whole data if agument is specified
train_dataset = train_dataset.select(
range(data_args.max_train_samples))
# Create train feature from dataset
train_dataset = train_dataset.map(
prepare_train_features,
batched=True,
num_proc=data_args.preprocessing_num_workers,
remove_columns=column_names,
load_from_cache_file=not data_args.overwrite_cache,
)
if data_args.max_train_samples is not None:
# Number of samples might increase during Feature Creation, We select only specified max samples
train_dataset = train_dataset.select(
range(data_args.max_train_samples))
processed_raw_datasets["train"] = train_dataset
# Validation preprocessing
def prepare_validation_features(examples):
# Some of the questions have lots of whitespace on the left, which is not useful and will make the
# truncation of the context fail (the tokenized question will take a lots of space). So we remove that
# left whitespace
examples[question_column_name] = [
q.lstrip() for q in examples[question_column_name]
]
# Tokenize our examples with truncation and maybe padding, but keep the overflows using a stride. This results
# in one example possible giving several features when a context is long, each of those features having a
# context that overlaps a bit the context of the previous feature.
tokenized_examples = tokenizer(
examples[
question_column_name if pad_on_right else context_column_name],
examples[
context_column_name if pad_on_right else question_column_name],
truncation="only_second" if pad_on_right else "only_first",
max_length=max_seq_length,
stride=data_args.doc_stride,
return_overflowing_tokens=True,
return_offsets_mapping=True,
padding="max_length",
)
# Since one example might give us several features if it has a long context, we need a map from a feature to
# its corresponding example. This key gives us just that.
sample_mapping = tokenized_examples.pop("overflow_to_sample_mapping")
# For evaluation, we will need to convert our predictions to substrings of the context, so we keep the
# corresponding example_id and we will store the offset mappings.
tokenized_examples["example_id"] = []
for i in range(len(tokenized_examples["input_ids"])):
# Grab the sequence corresponding to that example (to know what is the context and what is the question).
sequence_ids = tokenized_examples.sequence_ids(i)
context_index = 1 if pad_on_right else 0
# One example can give several spans, this is the index of the example containing this span of text.
sample_index = sample_mapping[i]
tokenized_examples["example_id"].append(
examples["id"][sample_index])
# Set to None the offset_mapping that are not part of the context so it's easy to determine if a token
# position is part of the context or not.
tokenized_examples["offset_mapping"][i] = [
(o if sequence_ids[k] == context_index else None)
for k, o in enumerate(tokenized_examples["offset_mapping"][i])
]
return tokenized_examples
if training_args.do_eval:
if "validation" not in raw_datasets:
raise ValueError("--do_eval requires a validation dataset")
eval_examples = raw_datasets["validation"]
if data_args.max_eval_samples is not None:
# We will select sample from whole data
eval_examples = eval_examples.select(
range(data_args.max_eval_samples))
# Validation Feature Creation
eval_dataset = eval_examples.map(
prepare_validation_features,
batched=True,
num_proc=data_args.preprocessing_num_workers,
remove_columns=column_names,
load_from_cache_file=not data_args.overwrite_cache,
)
if data_args.max_eval_samples is not None:
# During Feature creation dataset samples might increase, we will select required samples again
eval_dataset = eval_dataset.select(
range(data_args.max_eval_samples))
processed_raw_datasets["validation"] = eval_dataset
if training_args.do_predict:
if "test" not in raw_datasets:
raise ValueError("--do_predict requires a test dataset")
predict_examples = raw_datasets["test"]
if data_args.max_predict_samples is not None:
# We will select sample from whole data
predict_examples = predict_examples.select(
range(data_args.max_predict_samples))
# Predict Feature Creation
predict_dataset = predict_examples.map(
prepare_validation_features,
batched=True,
num_proc=data_args.preprocessing_num_workers,
remove_columns=column_names,
load_from_cache_file=not data_args.overwrite_cache,
)
if data_args.max_predict_samples is not None:
# During Feature creation dataset samples might increase, we will select required samples again
predict_dataset = predict_dataset.select(
range(data_args.max_predict_samples))
processed_raw_datasets["test"] = predict_dataset
# endregion
# region Metrics and Post-processing:
def post_processing_function(examples,
features,
predictions,
stage="eval"):
# Post-processing: we match the start logits and end logits to answers in the original context.
predictions = postprocess_qa_predictions(
examples=examples,
features=features,
predictions=predictions,
version_2_with_negative=data_args.version_2_with_negative,
n_best_size=data_args.n_best_size,
max_answer_length=data_args.max_answer_length,
null_score_diff_threshold=data_args.null_score_diff_threshold,
output_dir=training_args.output_dir,
prefix=stage,
)
# Format the result to the format the metric expects.
if data_args.version_2_with_negative:
formatted_predictions = [{
"id": k,
"prediction_text": v,
"no_answer_probability": 0.0
} for k, v in predictions.items()]
else:
formatted_predictions = [{
"id": k,
"prediction_text": v
} for k, v in predictions.items()]
references = [{
"id": ex["id"],
"answers": ex[answer_column_name]
} for ex in examples]
return EvalPrediction(predictions=formatted_predictions,
label_ids=references)
metric = load_metric(
"squad_v2" if data_args.version_2_with_negative else "squad")
def compute_metrics(p: EvalPrediction):
return metric.compute(predictions=p.predictions,
references=p.label_ids)
# Create and fill numpy array of size len_of_validation_data * max_length_of_output_tensor
def create_and_fill_np_array(start_or_end_logits, dataset, max_len):
"""
Create and fill numpy array of size len_of_validation_data * max_length_of_output_tensor
Args:
start_or_end_logits(:obj:`tensor`):
This is the output predictions of the model. We can only enter either start or end logits.
eval_dataset: Evaluation dataset
max_len(:obj:`int`):
The maximum length of the output tensor. ( See the model.eval() part for more details )
"""
step = 0
# create a numpy array and fill it with -100.
logits_concat = np.full((len(dataset), max_len),
-100,
dtype=np.float64)
# Now since we have create an array now we will populate it with the outputs of the model.
for i, output_logit in enumerate(
start_or_end_logits): # populate columns
# We have to fill it such that we have to take the whole tensor and replace it on the newly created array
# And after every iteration we have to change the step
batch_size = output_logit.shape[0]
cols = output_logit.shape[1]
if step + batch_size < len(dataset):
logits_concat[step:step + batch_size, :cols] = output_logit
else:
logits_concat[step:, :cols] = output_logit[:len(dataset) -
step]
step += batch_size
return logits_concat
# endregion
# region Training steps and logging init
train_dataset = processed_raw_datasets["train"]
eval_dataset = processed_raw_datasets["validation"]
# Log a few random samples from the training set:
for index in random.sample(range(len(train_dataset)), 3):
logger.info(
f"Sample {index} of the training set: {train_dataset[index]}.")
# Define a summary writer
has_tensorboard = is_tensorboard_available()
if has_tensorboard and jax.process_index() == 0:
try:
from flax.metrics.tensorboard import SummaryWriter
summary_writer = SummaryWriter(training_args.output_dir)
summary_writer.hparams({
**training_args.to_dict(),
**vars(model_args),
**vars(data_args)
})
except ImportError as ie:
has_tensorboard = False
logger.warning(
f"Unable to display metrics through TensorBoard because some package are not installed: {ie}"
)
else:
logger.warning(
"Unable to display metrics through TensorBoard because the package is not installed: "
"Please run pip install tensorboard to enable.")
def write_train_metric(summary_writer, train_metrics, train_time, step):
summary_writer.scalar("train_time", train_time, step)
train_metrics = get_metrics(train_metrics)
for key, vals in train_metrics.items():
tag = f"train_{key}"
for i, val in enumerate(vals):
summary_writer.scalar(tag, val, step - len(vals) + i + 1)
def write_eval_metric(summary_writer, eval_metrics, step):
for metric_name, value in eval_metrics.items():
summary_writer.scalar(f"eval_{metric_name}", value, step)
num_epochs = int(training_args.num_train_epochs)
rng = jax.random.PRNGKey(training_args.seed)
dropout_rngs = jax.random.split(rng, jax.local_device_count())
train_batch_size = training_args.per_device_train_batch_size * jax.local_device_count(
)
eval_batch_size = training_args.per_device_eval_batch_size * jax.local_device_count(
)
# endregion
# region Load model
model = FlaxAutoModelForQuestionAnswering.from_pretrained(
model_args.model_name_or_path,
config=config,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
seed=training_args.seed,
dtype=getattr(jnp, model_args.dtype),
)
learning_rate_fn = create_learning_rate_fn(
len(train_dataset),
train_batch_size,
training_args.num_train_epochs,
training_args.warmup_steps,
training_args.learning_rate,
)
state = create_train_state(model,
learning_rate_fn,
num_labels=max_seq_length,
training_args=training_args)
# endregion
# region Define train step functions
def train_step(
state: train_state.TrainState, batch: Dict[str, Array],
dropout_rng: PRNGKey) -> Tuple[train_state.TrainState, float]:
"""Trains model with an optimizer (both in `state`) on `batch`, returning a pair `(new_state, loss)`."""
dropout_rng, new_dropout_rng = jax.random.split(dropout_rng)
start_positions = batch.pop("start_positions")
end_positions = batch.pop("end_positions")
targets = (start_positions, end_positions)
def loss_fn(params):
logits = state.apply_fn(**batch,
params=params,
dropout_rng=dropout_rng,
train=True)
loss = state.loss_fn(logits, targets)
return loss
grad_fn = jax.value_and_grad(loss_fn)
loss, grad = grad_fn(state.params)
grad = jax.lax.pmean(grad, "batch")
new_state = state.apply_gradients(grads=grad)
metrics = jax.lax.pmean(
{
"loss": loss,
"learning_rate": learning_rate_fn(state.step)
},
axis_name="batch")
return new_state, metrics, new_dropout_rng
p_train_step = jax.pmap(train_step,
axis_name="batch",
donate_argnums=(0, ))
# endregion
# region Define eval step functions
def eval_step(state, batch):
logits = state.apply_fn(**batch, params=state.params, train=False)
return state.logits_fn(logits)
p_eval_step = jax.pmap(eval_step, axis_name="batch")
# endregion
# region Define train and eval loop
logger.info(f"===== Starting training ({num_epochs} epochs) =====")
train_time = 0
# make sure weights are replicated on each device
state = replicate(state)
train_time = 0
step_per_epoch = len(train_dataset) // train_batch_size
total_steps = step_per_epoch * num_epochs
epochs = tqdm(range(num_epochs),
desc=f"Epoch ... (1/{num_epochs})",
position=0)
for epoch in epochs:
train_start = time.time()
train_metrics = []
# Create sampling rng
rng, input_rng = jax.random.split(rng)
# train
for step, batch in enumerate(
tqdm(
train_data_collator(input_rng, train_dataset,
train_batch_size),
total=step_per_epoch,
desc="Training...",
position=1,
),
1,
):
state, train_metric, dropout_rngs = p_train_step(
state, batch, dropout_rngs)
train_metrics.append(train_metric)
cur_step = epoch * step_per_epoch + step
if cur_step % training_args.logging_steps == 0 and cur_step > 0:
# Save metrics
train_metric = unreplicate(train_metric)
train_time += time.time() - train_start
if has_tensorboard and jax.process_index() == 0:
write_train_metric(summary_writer, train_metrics,
train_time, cur_step)
epochs.write(
f"Step... ({cur_step}/{total_steps} | Training Loss: {train_metric['loss']}, Learning Rate: {train_metric['learning_rate']})"
)
train_metrics = []
if (training_args.do_eval
and (cur_step % training_args.eval_steps == 0
or cur_step % step_per_epoch == 0) and cur_step > 0):
eval_metrics = {}
all_start_logits = []
all_end_logits = []
# evaluate
for batch in tqdm(
eval_data_collator(eval_dataset, eval_batch_size),
total=len(eval_dataset) // eval_batch_size,
desc="Evaluating ...",
position=2,
):
_ = batch.pop("example_id")
_ = batch.pop("offset_mapping")
predictions = p_eval_step(state, batch)
start_logits = np.array(
[pred for pred in chain(*predictions[0])])
end_logits = np.array(
[pred for pred in chain(*predictions[1])])
all_start_logits.append(start_logits)
all_end_logits.append(end_logits)
# evaluate also on leftover examples (not divisible by batch_size)
num_leftover_samples = len(eval_dataset) % eval_batch_size
# make sure leftover batch is evaluated on one device
if num_leftover_samples > 0 and jax.process_index() == 0:
# take leftover samples
batch = eval_dataset[-num_leftover_samples:]
batch = {k: np.array(v) for k, v in batch.items()}
_ = batch.pop("example_id")
_ = batch.pop("offset_mapping")
predictions = eval_step(unreplicate(state), batch)
start_logits = np.array([pred for pred in predictions[0]])
end_logits = np.array([pred for pred in predictions[1]])
all_start_logits.append(start_logits)
all_end_logits.append(end_logits)
max_len = max([x.shape[1] for x in all_start_logits
]) # Get the max_length of the tensor
# concatenate the numpy array
start_logits_concat = create_and_fill_np_array(
all_start_logits, eval_dataset, max_len)
end_logits_concat = create_and_fill_np_array(
all_end_logits, eval_dataset, max_len)
# delete the list of numpy arrays
del all_start_logits
del all_end_logits
outputs_numpy = (start_logits_concat, end_logits_concat)
prediction = post_processing_function(eval_examples,
eval_dataset,
outputs_numpy)
eval_metrics = compute_metrics(prediction)
logger.info(
f"Step... ({cur_step}/{total_steps} | Evaluation metrics: {eval_metrics})"
)
if has_tensorboard and jax.process_index() == 0:
write_eval_metric(summary_writer, eval_metrics, cur_step)
if (cur_step % training_args.save_steps == 0
and cur_step > 0) or (cur_step == total_steps):
# save checkpoint after each epoch and push checkpoint to the hub
if jax.process_index() == 0:
params = jax.device_get(unreplicate(state.params))
model.save_pretrained(training_args.output_dir,
params=params)
tokenizer.save_pretrained(training_args.output_dir)
if training_args.push_to_hub:
repo.push_to_hub(
commit_message=
f"Saving weights and logs of step {cur_step}",
blocking=False)
epochs.desc = f"Epoch ... {epoch + 1}/{num_epochs}"
# endregion
# Eval after training
if training_args.do_eval:
eval_metrics = {}
all_start_logits = []
all_end_logits = []
eva_loader = eval_data_collator(eval_dataset, eval_batch_size)
for batch in tqdm(eva_loader,
total=len(eval_dataset) // eval_batch_size,
desc="Evaluating ...",
position=2):
_ = batch.pop("example_id")
_ = batch.pop("offset_mapping")
predictions = p_eval_step(state, batch)
start_logits = np.array([pred for pred in chain(*predictions[0])])
end_logits = np.array([pred for pred in chain(*predictions[1])])
all_start_logits.append(start_logits)
all_end_logits.append(end_logits)
# evaluate also on leftover examples (not divisible by batch_size)
num_leftover_samples = len(eval_dataset) % eval_batch_size
# make sure leftover batch is evaluated on one device
if num_leftover_samples > 0 and jax.process_index() == 0:
# take leftover samples
batch = eval_dataset[-num_leftover_samples:]
batch = {k: np.array(v) for k, v in batch.items()}
_ = batch.pop("example_id")
_ = batch.pop("offset_mapping")
predictions = eval_step(unreplicate(state), batch)
start_logits = np.array([pred for pred in predictions[0]])
end_logits = np.array([pred for pred in predictions[1]])
all_start_logits.append(start_logits)
all_end_logits.append(end_logits)
max_len = max([x.shape[1] for x in all_start_logits
]) # Get the max_length of the tensor
# concatenate the numpy array
start_logits_concat = create_and_fill_np_array(all_start_logits,
eval_dataset, max_len)
end_logits_concat = create_and_fill_np_array(all_end_logits,
eval_dataset, max_len)
# delete the list of numpy arrays
del all_start_logits
del all_end_logits
outputs_numpy = (start_logits_concat, end_logits_concat)
prediction = post_processing_function(eval_examples, eval_dataset,
outputs_numpy)
eval_metrics = compute_metrics(prediction)
if jax.process_index() == 0:
eval_metrics = {
f"eval_{metric_name}": value
for metric_name, value in eval_metrics.items()
}
path = os.path.join(training_args.output_dir, "eval_results.json")
with open(path, "w") as f:
json.dump(eval_metrics, f, indent=4, sort_keys=True)
def train_and_evaluate(config, workdir):
"""Runs a training and evaluation loop.
Args:
config: Configuration to use.
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
"""
if config.dataset.batch_size % jax.device_count() != 0:
raise ValueError(
"Batch size must be divisible by the number of devices.")
tf.io.gfile.makedirs(workdir)
# Deterministic training.
rng = jax.random.PRNGKey(config.seed)
# Shift the numpy random seed by process_index() to shuffle data loaded
# by different hosts
np.random.seed(20201473 + jax.process_index())
#----------------------------------------------------------------------------
# Build input pipeline.
rng, data_rng = jax.random.split(rng)
data_rng = jax.random.fold_in(data_rng, jax.process_index())
scene_path_list = train_utils.get_train_scene_list(config)
train_ds = datasets.create_train_dataset(config, scene_path_list[0])
_, eval_ds_dict = datasets.create_eval_dataset(config)
_, eval_ds = eval_ds_dict.popitem()
example_batch = train_ds.peek()
#----------------------------------------------------------------------------
# Learning rate schedule.
num_train_steps = config.train.max_steps
if num_train_steps == -1:
num_train_steps = train_ds.size()
steps_per_epoch = num_train_steps // config.train.num_epochs
logging.info("num_train_steps=%d, steps_per_epoch=%d", num_train_steps,
steps_per_epoch)
learning_rate_fn = train_utils.create_learning_rate_fn(config)
#----------------------------------------------------------------------------
# Initialize model.
rng, model_rng = jax.random.split(rng)
model, state = models.create_train_state(
config,
model_rng,
learning_rate_fn=learning_rate_fn,
example_batch=example_batch,
)
#----------------------------------------------------------------------------
# Set up checkpointing of the model and the input pipeline.
# check if the job was stopped and relaunced
latest_ckpt = checkpoints.latest_checkpoint(workdir)
if latest_ckpt is None:
# No previous checkpoint. Then check for pretrained weights.
if config.train.pretrain_dir:
state = checkpoints.restore_checkpoint(config.train.pretrain_dir,
state)
else:
state = checkpoints.restore_checkpoint(workdir, state)
initial_step = int(state.step) + 1
step_per_scene = config.train.switch_scene_iter
if config.dev_run:
jnp.set_printoptions(precision=2)
np.set_printoptions(precision=2)
step_per_scene = 3
#----------------------------------------------------------------------------
# Distribute training.
state = flax_utils.replicate(state)
p_train_step = jax.pmap(
functools.partial(
train_step,
model=model,
learning_rate_fn=learning_rate_fn,
weight_decay=config.train.weight_decay,
config=config,
),
axis_name="batch",
)
# Get distributed rendering function
render_pfn = render_utils.get_render_function(
model=model,
config=config,
randomized=False, # No randomization for evaluation.
)
#----------------------------------------------------------------------------
# Prepare Metric Writers
writer = metric_writers.create_default_writer(
workdir, just_logging=jax.process_index() > 0)
if initial_step == 1:
writer.write_hparams(dict(config))
logging.info("Starting training loop at step %d.", initial_step)
hooks = []
report_progress = periodic_actions.ReportProgress(
num_train_steps=num_train_steps, writer=writer)
if jax.process_index() == 0:
hooks += [
report_progress,
]
train_metrics = None
# Prefetch_buffer_size = 6 x batch_size
ptrain_ds = flax.jax_utils.prefetch_to_device(train_ds, 6)
n_local_devices = jax.local_device_count()
rng = rng + jax.process_index() # Make random seed separate across hosts.
keys = jax.random.split(rng, n_local_devices) # For pmapping RNG keys.
with metric_writers.ensure_flushes(writer):
for step in range(initial_step, num_train_steps + 1):
# `step` is a Python integer. `state.step` is JAX integer on the GPU/TPU
# devices.
if step % step_per_scene == 0:
scene_idx = np.random.randint(len(scene_path_list))
logging.info("Loading scene {}".format(
scene_path_list[scene_idx])) # pylint: disable=logging-format-interpolation
curr_scene = scene_path_list[scene_idx]
if config.dataset.name == "dtu":
# lighting can take values between 0 and 6 (both included)
config.dataset.dtu_light_idx = np.random.randint(low=0,
high=7)
train_ds = datasets.create_train_dataset(config, curr_scene)
ptrain_ds = flax.jax_utils.prefetch_to_device(train_ds, 6)
is_last_step = step == num_train_steps
with jax.profiler.StepTraceAnnotation("train", step_num=step):
batch = next(ptrain_ds)
state, metrics_update, keys = p_train_step(rng=keys,
state=state,
batch=batch)
metric_update = flax_utils.unreplicate(metrics_update)
train_metrics = (metric_update if train_metrics is None else
train_metrics.merge(metric_update))
# Quick indication that training is happening.
logging.log_first_n(logging.INFO, "Finished training step %d.", 5,
step)
for h in hooks:
h(step)
if step % config.train.log_loss_every_steps == 0 or is_last_step:
writer.write_scalars(step, train_metrics.compute())
train_metrics = None
if step % config.train.render_every_steps == 0 or is_last_step:
test_batch = next(eval_ds)
test_pixels = model_utils.uint2float(
test_batch.target_view.rgb) # extract for evaluation
with report_progress.timed("eval"):
pred_color, pred_disp, pred_acc = eval_step(
state, keys[0], test_batch, render_pfn, config)
#------------------------------------------------------------------
# Log metrics and images for host 0
#------------------------------------------------------------------
if jax.process_index() == 0:
psnr = model_utils.compute_psnr(
((pred_color - test_pixels)**2).mean())
ssim = 0.
writer.write_scalars(
step, {
"train_eval/test_psnr": psnr,
"train_eval/test_ssim": ssim,
})
writer.write_images(
step, {
"test_pred_color": pred_color[None, :],
"test_target": test_pixels[None, :]
})
if pred_disp is not None:
writer.write_images(
step, {"test_pred_disp": pred_disp[None, :]})
if pred_acc is not None:
writer.write_images(
step, {"test_pred_acc": pred_acc[None, :]})
#------------------------------------------------------------------
if (jax.process_index()
== 0) and (step % config.train.checkpoint_every_steps == 0
or is_last_step):
# Write final metrics to file
with file_utils.open_file(
os.path.join(workdir, "train_logs.json"), "w") as f:
log_dict = metric_update.compute()
for k, v in log_dict.items():
log_dict[k] = v.item()
f.write(json.dumps(log_dict))
with report_progress.timed("checkpoint"):
state_to_save = jax.device_get(
jax.tree_map(lambda x: x[0], state))
checkpoints.save_checkpoint(workdir,
state_to_save,
step,
keep=100)
logging.info("Finishing training at step %d", num_train_steps)
def experiment(
model_dir='.', # pylint: disable=dangerous-default-value
imagenet_subset_dir=None,
dataset='cifar10',
batch_size=256,
eval_batch_size=1024,
num_epochs=200,
learning_rate=0.1,
aug_imagenet_apply_colour_jitter=False,
aug_imagenet_greyscale_prob=0.0,
sgd_momentum=0.9,
sgd_nesterov=True,
lr_schedule='stepped',
lr_sched_steps=[[60, 0.2], [120, 0.04], [160, 0.008]],
lr_sched_halfcoslength=400.0,
lr_sched_warmup=5.0,
l2_reg=0.0005,
weight_decay=0.0,
architecture='wrn22_10',
n_val=5000,
n_sup=1000,
teacher_alpha=0.999,
anneal_teacher_alpha=False,
unsupervised_regularizer='none',
cons_weight=1.0,
conf_thresh=0.97,
conf_avg=False,
cut_backg_noise=1.0,
cut_prob=1.0,
box_reg_scale_mode='fixed',
box_reg_scale=0.25,
box_reg_random_aspect_ratio=False,
cow_sigma_range=(4.0, 8.0),
cow_prop_range=(0.25, 1.0),
mix_regularizer='none',
mix_aug_separately=False,
mix_logits=True,
mix_weight=1.0,
mix_conf_thresh=0.97,
mix_conf_avg=True,
mix_conf_mode='mix_prob',
ict_alpha=0.1,
mix_box_reg_scale_mode='fixed',
mix_box_reg_scale=0.25,
mix_box_reg_random_aspect_ratio=False,
mix_cow_sigma_range=(4.0, 8.0),
mix_cow_prop_range=(0.0, 1.0),
subset_seed=12345,
val_seed=131,
run_seed=None,
log_fn=print,
checkpoints='on',
on_epoch_finished_fn=None,
debug=False):
"""Run experiment."""
if checkpoints not in {'none', 'on', 'retain'}:
raise ValueError('checkpoints should be one of (none|on|retain)')
if checkpoints != 'none':
checkpoint_path = os.path.join(model_dir, 'checkpoint.pkl')
checkpoint_new_path = os.path.join(model_dir, 'checkpoint.pkl.new')
else:
checkpoint_path = None
checkpoint_new_path = None
if dataset not in {'svhn', 'cifar10', 'cifar100', 'imagenet'}:
raise ValueError('Unknown dataset \'{}\''.format(dataset))
if architecture not in {
'wrn20_10', 'wrn26_10', 'wrn26_2', 'wrn20_6_shakeshake',
'wrn26_6_shakeshake', 'wrn26_2_shakeshake', 'pyramid', 'resnet50',
'resnet101', 'resnet152', 'resnet50x2', 'resnet101x2',
'resnet152x2', 'resnet50x4', 'resnet101x4', 'resnet152x4',
'resnext50_32x4d', 'resnext101_32x8d', 'resnext152_32x4d'
}:
raise ValueError('Unknown architecture \'{}\''.format(architecture))
if lr_schedule not in {'constant', 'stepped', 'cosine'}:
raise ValueError('Unknown LR schedule \'{}\''.format(lr_schedule))
if mix_conf_mode not in {'mix_prob', 'mix_conf'}:
raise ValueError('Unknown mix_conf_mode \'{}\''.format(mix_conf_mode))
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(model_dir)
else:
summary_writer = None
unsup_reg, augment_twice = build_pert_reg(
unsupervised_regularizer,
cut_backg_noise=cut_backg_noise,
cut_prob=cut_prob,
box_reg_scale_mode=box_reg_scale_mode,
box_reg_scale=box_reg_scale,
box_reg_random_aspect_ratio=box_reg_random_aspect_ratio,
cow_sigma_range=cow_sigma_range,
cow_prop_range=cow_prop_range)
mix_reg = build_mix_reg(
mix_regularizer,
ict_alpha=ict_alpha,
box_reg_scale_mode=mix_box_reg_scale_mode,
box_reg_scale=mix_box_reg_scale,
box_reg_random_aspect_ratio=mix_box_reg_random_aspect_ratio,
cow_sigma_range=mix_cow_sigma_range,
cow_prop_range=mix_cow_prop_range)
if run_seed is None:
run_seed = subset_seed << 32 | n_val
train_rng = jax.random.PRNGKey(run_seed)
init_rng, train_rng = jax.random.split(train_rng)
if batch_size % jax.device_count() > 0:
raise ValueError('Train batch size must be divisible by the number of '
'devices')
if eval_batch_size % jax.device_count() > 0:
raise ValueError('Eval batch size must be divisible by the number of '
'devices')
local_batch_size = batch_size // jax.host_count()
local_eval_batch_size = eval_batch_size // jax.host_count()
device_batch_size = batch_size // jax.device_count()
if dataset == 'svhn':
image_size = 32
top5_err_required = False
data_source = small_image_data_source.SVHNDataSource(
n_val=n_val,
n_sup=n_sup,
train_batch_size=local_batch_size,
eval_batch_size=local_eval_batch_size,
augment_twice=augment_twice,
subset_seed=subset_seed,
val_seed=val_seed)
elif dataset == 'cifar10':
image_size = 32
top5_err_required = False
data_source = small_image_data_source.CIFAR10DataSource(
n_val=n_val,
n_sup=n_sup,
train_batch_size=local_batch_size,
eval_batch_size=local_eval_batch_size,
augment_twice=augment_twice,
subset_seed=subset_seed,
val_seed=val_seed)
elif dataset == 'cifar100':
image_size = 32
top5_err_required = False
data_source = small_image_data_source.CIFAR100DataSource(
n_val=n_val,
n_sup=n_sup,
train_batch_size=local_batch_size,
eval_batch_size=local_eval_batch_size,
augment_twice=augment_twice,
subset_seed=subset_seed,
val_seed=val_seed)
elif dataset == 'imagenet':
image_size = 224
top5_err_required = True
if imagenet_subset_dir is None:
raise ValueError(
'Please provide a directory to the imagenet_subset_dir '
'command line arg to specify where the ImageNet '
'subsets are stored')
data_source = imagenet_data_source.ImageNetDataSource(
imagenet_subset_dir,
n_val,
n_sup,
local_batch_size,
local_eval_batch_size,
augment_twice,
apply_colour_jitter=aug_imagenet_apply_colour_jitter,
greyscale_prob=aug_imagenet_greyscale_prob,
load_test_set=(n_val == 0),
image_size=image_size,
subset_seed=subset_seed,
val_seed=val_seed)
else:
raise RuntimeError
n_train = data_source.n_train
train_ds = data_source.train_semisup_ds
if n_val == 0:
eval_ds = data_source.test_ds
n_eval = data_source.n_test
else:
eval_ds = data_source.val_ds
n_eval = data_source.n_val
log_fn(
'DATA: |train|={}, |sup|={}, |eval|={}, (|val|={}, |test|={})'.format(
data_source.n_train, data_source.n_sup, n_eval, data_source.n_val,
data_source.n_test))
log_fn('Loaded dataset')
steps_per_epoch = n_train // batch_size
steps_per_eval = n_eval // eval_batch_size
if n_eval % eval_batch_size > 0:
steps_per_eval += 1
num_steps = steps_per_epoch * num_epochs
# Create model
model_stu, state_stu = create_model(init_rng, architecture,
device_batch_size, image_size,
data_source.n_classes)
state_stu = jax_utils.replicate(state_stu)
log_fn('Built model')
# Create optimizer
optimizer_def = optim.Momentum(learning_rate=learning_rate,
beta=sgd_momentum,
nesterov=sgd_nesterov)
optimizer_stu = optimizer_def.create(model_stu)
optimizer_stu = optimizer_stu.replicate()
del model_stu # don't keep a copy of the initial model
# Create learning rate function
base_learning_rate = learning_rate * batch_size / 256.
if lr_schedule == 'constant':
learning_rate_fn = create_constant_learning_rate_fn(base_learning_rate)
elif lr_schedule == 'stepped':
learning_rate_fn = create_stepped_learning_rate_fn(
base_learning_rate,
steps_per_epoch,
lr_sched_steps=lr_sched_steps,
warmup_length=lr_sched_warmup)
elif lr_schedule == 'cosine':
learning_rate_fn = create_cosine_learning_rate_fn(
base_learning_rate,
steps_per_epoch,
halfcoslength_epochs=lr_sched_halfcoslength,
warmup_length=lr_sched_warmup)
else:
raise RuntimeError
if anneal_teacher_alpha:
if lr_schedule == 'constant':
one_minus_alpha_fn = create_constant_learning_rate_fn(
1.0 - teacher_alpha)
elif lr_schedule == 'stepped':
one_minus_alpha_fn = create_stepped_learning_rate_fn(
1.0 - teacher_alpha,
steps_per_epoch,
lr_sched_steps=lr_sched_steps)
elif lr_schedule == 'cosine':
one_minus_alpha_fn = create_cosine_learning_rate_fn(
1.0 - teacher_alpha,
steps_per_epoch,
halfcoslength_epochs=lr_sched_halfcoslength)
else:
raise RuntimeError
teacher_alpha_fn = lambda step: 1.0 - one_minus_alpha_fn(step)
else:
teacher_alpha_fn = lambda step: teacher_alpha
log_fn('Built optimizer')
# Teacher model is just the student as we duplicate it when we modify it
model_tea = optimizer_stu.target
# Replicate batch stats
state_tea = jax.tree_map(lambda x: x, state_stu)
# Set up epoch and step counter
# Load existing checkpoint if available
epoch = 1
step = 0
if checkpoints != 'none':
if tf.io.gfile.exists(checkpoint_path):
with tf.io.gfile.GFile(checkpoint_path, 'rb') as f_in:
check = pickle.load(f_in)
# Student optimizer and batch stats
optimizer_stu = util.restore_state_list(
optimizer_stu, check['optimizer_stu'])
state_stu = util.restore_state_list(state_stu,
check['state_stu'])
# Teacher model and batch stats
model_tea = util.restore_state_list(model_tea,
check['model_tea'])
state_tea = util.restore_state_list(state_tea,
check['state_tea'])
epoch = check['epoch']
step = check['step']
log_fn('Loaded checkpoint from {}'.format(checkpoint_path))
#
# Training and evaluation step functions
#
p_train_step = jax.pmap(functools.partial(
train_step,
learning_rate_fn=learning_rate_fn,
l2_reg=l2_reg,
weight_decay=weight_decay,
teacher_alpha_fn=teacher_alpha_fn,
unsup_reg=unsup_reg,
cons_weight=cons_weight,
conf_thresh=conf_thresh,
conf_avg=conf_avg,
mix_reg=mix_reg,
mix_aug_separately=mix_aug_separately,
mix_logits=mix_logits,
mix_weight=mix_weight,
mix_conf_thresh=mix_conf_thresh,
mix_conf_avg=mix_conf_avg,
mix_conf_mode=mix_conf_mode),
axis_name='batch')
p_eval_step = jax.pmap(functools.partial(eval_step,
eval_top_5=top5_err_required),
axis_name='batch')
# Create dataset batch iterators
train_iter = iter(train_ds)
eval_iter = iter(eval_ds)
#
# Training loop
#
log_fn('Training...')
epoch_metrics_stu = []
t1 = time.time()
while step < num_steps:
train_rng, iter_rng = jax.random.split(train_rng)
batch = next(train_iter)
batch = jax.tree_map(lambda x: x._numpy(), batch) # pylint: disable=protected-access
batch = shard(batch, iter_rng)
optimizer_stu, state_stu, metrics_stu, model_tea, state_tea = p_train_step(
optimizer_stu, state_stu, model_tea, state_tea, batch)
if debug:
log_fn('Step {} time {}'.format(step, time.time() - t1))
epoch_metrics_stu.append(metrics_stu)
if (step + 1) % steps_per_epoch == 0:
epoch_metrics_stu = util.get_metrics(epoch_metrics_stu)
train_epoch_metrics = jax.tree_map(lambda x: x.mean(),
epoch_metrics_stu)
if summary_writer is not None:
for key, vals in epoch_metrics_stu.items():
tag = 'train_%s' % key
for i, val in enumerate(vals):
summary_writer.scalar(tag, val,
step - len(vals) + i + 1)
epoch_metrics_stu = []
eval_stu_metrics = []
eval_tea_metrics = []
for _ in range(steps_per_eval):
eval_batch = next(eval_iter)
# TF to NumPy
eval_batch = jax.tree_map(lambda x: x._numpy(), eval_batch) # pylint: disable=protected-access
# Pad short batches
eval_batch = util.pad_classification_batch(
eval_batch, local_eval_batch_size)
# Shard across local devices
eval_batch = shard(eval_batch)
metrics_stu = p_eval_step(optimizer_stu.target, state_stu,
eval_batch)
metrics_tea = p_eval_step(model_tea, state_tea, eval_batch)
eval_stu_metrics.append(metrics_stu)
eval_tea_metrics.append(metrics_tea)
eval_stu_metrics = util.get_metrics(eval_stu_metrics)
eval_tea_metrics = util.get_metrics(eval_tea_metrics)
eval_stu_epoch_metrics = jax.tree_map(lambda x: x.sum(),
eval_stu_metrics)
eval_tea_epoch_metrics = jax.tree_map(lambda x: x.sum(),
eval_tea_metrics)
eval_stu_epoch_metrics = avg_eval_metrics(eval_stu_epoch_metrics)
eval_tea_epoch_metrics = avg_eval_metrics(eval_tea_epoch_metrics)
t2 = time.time()
if top5_err_required:
log_fn(
'EPOCH {} (took {:.3f}s): Train loss={:.6f}, err={:.3%}, '
'cons loss={:.6f}, conf rate={:.3%}, mix loss={:.6f}, '
'mix conf rate={:.3%}; STU Eval loss={:.6f}, err={:.3%}, '
'top-5-err={:.3%}, TEA Eval loss={:.6f}, err={:.3%}, '
'top-5-err={:.3%}'.format(
epoch,
t2 - t1,
train_epoch_metrics['loss'],
train_epoch_metrics['error_rate'],
train_epoch_metrics['cons_loss'],
train_epoch_metrics['conf_rate'],
train_epoch_metrics['mix_loss'],
train_epoch_metrics['mix_conf_rate'],
eval_stu_epoch_metrics['loss'],
eval_stu_epoch_metrics['error_rate'],
eval_stu_epoch_metrics['top5_error_rate'],
eval_tea_epoch_metrics['loss'],
eval_tea_epoch_metrics['error_rate'],
eval_tea_epoch_metrics['top5_error_rate'],
))
else:
log_fn(
'EPOCH {} (took {:.3f}s): Train loss={:.6f}, err={:.3%}, '
'cons loss={:.6f}, conf rate={:.3%}, mix loss={:.6f}, '
'mix conf rate={:.3%}; STU Eval loss={:.6f}, err={:.3%}, '
'TEA Eval loss={:.6f}, err={:.3%}'.format(
epoch,
t2 - t1,
train_epoch_metrics['loss'],
train_epoch_metrics['error_rate'],
train_epoch_metrics['cons_loss'],
train_epoch_metrics['conf_rate'],
train_epoch_metrics['mix_loss'],
train_epoch_metrics['mix_conf_rate'],
eval_stu_epoch_metrics['loss'],
eval_stu_epoch_metrics['error_rate'],
eval_tea_epoch_metrics['loss'],
eval_tea_epoch_metrics['error_rate'],
))
if on_epoch_finished_fn is not None:
if top5_err_required:
on_epoch_finished_fn(
epoch,
eval_stu_err=eval_stu_epoch_metrics['error_rate'],
eval_tea_err=eval_tea_epoch_metrics['error_rate'],
eval_stu_top5_err=eval_stu_epoch_metrics[
'top5_error_rate'],
eval_tea_top5_err=eval_tea_epoch_metrics[
'top5_error_rate'],
)
else:
on_epoch_finished_fn(
epoch,
eval_stu_err=eval_stu_epoch_metrics['error_rate'],
eval_tea_err=eval_tea_epoch_metrics['error_rate'],
)
t1 = t2
if summary_writer is not None:
summary_writer.scalar('eval_stu_loss',
eval_stu_epoch_metrics['loss'], epoch)
summary_writer.scalar('eval_stu_error_rate',
eval_stu_epoch_metrics['error_rate'],
epoch)
summary_writer.scalar('eval_tea_loss',
eval_tea_epoch_metrics['loss'], epoch)
summary_writer.scalar('eval_tea_error_rate',
eval_tea_epoch_metrics['error_rate'],
epoch)
if top5_err_required:
summary_writer.scalar(
'eval_stu_top5_error_rate',
eval_stu_epoch_metrics['top5_error_rate'], epoch)
summary_writer.scalar(
'eval_tea_top5_error_rate',
eval_tea_epoch_metrics['top5_error_rate'], epoch)
summary_writer.flush()
epoch += 1
if checkpoints != 'none':
if jax.host_id() == 0:
# Write to new checkpoint file so that we don't immediately
# overwrite the old one
with tf.io.gfile.GFile(checkpoint_new_path,
'wb') as f_out:
check = dict(
optimizer_stu=util.to_state_list(
optimizer_stu),
state_stu=util.to_state_list(state_stu),
model_tea=util.to_state_list(model_tea),
state_tea=util.to_state_list(state_tea),
epoch=epoch,
step=step + 1,
)
pickle.dump(check, f_out)
del check
# Remove old checkpoint and rename
if tf.io.gfile.exists(checkpoint_path):
tf.io.gfile.remove(checkpoint_path)
tf.io.gfile.rename(checkpoint_new_path,
checkpoint_path)
step += 1
if checkpoints == 'on':
if jax.host_id() == 0:
if tf.io.gfile.exists(checkpoint_path):
tf.io.gfile.remove(checkpoint_path)
def train_and_evaluate(config: ml_collections.ConfigDict,
workdir: str) -> TrainState:
"""Execute model training and evaluation loop.
Args:
config: Hyperparameter configuration for training and evaluation.
workdir: Directory where the tensorboard summaries are written to.
Returns:
Final TrainState.
"""
writer = metric_writers.create_default_writer(
logdir=workdir, just_logging=jax.host_id() != 0)
rng = random.PRNGKey(0)
image_size = 224
if config.batch_size % jax.device_count() > 0:
raise ValueError(
'Batch size must be divisible by the number of devices')
local_batch_size = config.batch_size // jax.process_count()
platform = jax.local_devices()[0].platform
if config.half_precision:
if platform == 'tpu':
input_dtype = tf.bfloat16
else:
input_dtype = tf.float16
else:
input_dtype = tf.float32
dataset_builder = tfds.builder(config.dataset)
train_iter = create_input_iter(dataset_builder,
local_batch_size,
image_size,
input_dtype,
train=True,
cache=config.cache)
eval_iter = create_input_iter(dataset_builder,
local_batch_size,
image_size,
input_dtype,
train=False,
cache=config.cache)
steps_per_epoch = (dataset_builder.info.splits['train'].num_examples //
config.batch_size)
if config.num_train_steps == -1:
num_steps = int(steps_per_epoch * config.num_epochs)
else:
num_steps = config.num_train_steps
if config.steps_per_eval == -1:
num_validation_examples = dataset_builder.info.splits[
'validation'].num_examples
steps_per_eval = num_validation_examples // config.batch_size
else:
steps_per_eval = config.steps_per_eval
steps_per_checkpoint = steps_per_epoch * 10
base_learning_rate = config.learning_rate * config.batch_size / 256.
model_cls = getattr(models, config.model)
model = create_model(model_cls=model_cls,
half_precision=config.half_precision)
learning_rate_fn = create_learning_rate_fn(config, base_learning_rate,
steps_per_epoch)
state = create_train_state(rng, config, model, image_size,
learning_rate_fn)
state = restore_checkpoint(state, workdir)
# step_offset > 0 if restarting from checkpoint
step_offset = int(state.step)
state = jax_utils.replicate(state)
p_train_step = jax.pmap(functools.partial(
train_step, learning_rate_fn=learning_rate_fn),
axis_name='batch')
p_eval_step = jax.pmap(eval_step, axis_name='batch')
train_metrics = []
hooks = []
if jax.process_index() == 0:
hooks += [
periodic_actions.Profile(num_profile_steps=5, logdir=workdir)
]
train_metrics_last_t = time.time()
logging.info('Initial compilation, this might take some minutes...')
for step, batch in zip(range(step_offset, num_steps), train_iter):
state, metrics = p_train_step(state, batch)
for h in hooks:
h(step)
if step == step_offset:
logging.info('Initial compilation completed.')
if config.get('log_every_steps'):
train_metrics.append(metrics)
if (step + 1) % config.log_every_steps == 0:
train_metrics = common_utils.get_metrics(train_metrics)
summary = {
f'train_{k}': v
for k, v in jax.tree_map(lambda x: x.mean(),
train_metrics).items()
}
summary['steps_per_second'] = config.log_every_steps / (
time.time() - train_metrics_last_t)
writer.write_scalars(step + 1, summary)
train_metrics = []
train_metrics_last_t = time.time()
if (step + 1) % steps_per_epoch == 0:
epoch = step // steps_per_epoch
eval_metrics = []
# sync batch statistics across replicas
state = sync_batch_stats(state)
for _ in range(steps_per_eval):
eval_batch = next(eval_iter)
metrics = p_eval_step(state, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
summary = jax.tree_map(lambda x: x.mean(), eval_metrics)
logging.info('eval epoch: %d, loss: %.4f, accuracy: %.2f', epoch,
summary['loss'], summary['accuracy'] * 100)
writer.write_scalars(
step + 1, {f'eval_{key}': val
for key, val in summary.items()})
writer.flush()
if (step + 1) % steps_per_checkpoint == 0 or step + 1 == num_steps:
state = sync_batch_stats(state)
save_checkpoint(state, workdir)
# Wait until computations are done before exiting
jax.random.normal(jax.random.PRNGKey(0), ()).block_until_ready()
return state
accuracy = jnp.equal(jnp.argmax(logits, axis=-1), labels) * label_mask
# summarize metrics
metrics = {
"loss": loss.sum(),
"accuracy": accuracy.sum(),
"normalizer": label_mask.sum()
}
metrics = jax.lax.psum(metrics, axis_name="batch")
return metrics
p_eval_step = jax.pmap(eval_step, "batch", donate_argnums=(0, ))
# Replicate the train state on each device
state = jax_utils.replicate(state)
train_time = 0
epochs = tqdm(range(num_epochs),
desc=f"Epoch ... (1/{num_epochs})",
position=0)
for epoch in epochs:
# ======================== Training ================================
train_start = time.time()
train_metrics = []
# Create sampling rng
rng, input_rng = jax.random.split(rng)
# Generate an epoch by shuffling sampling indices from the train dataset
num_train_samples = len(tokenized_datasets["train"])
def main(_):
tf.enable_v2_behavior()
tf.random.set_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
random.seed(FLAGS.seed)
if not gfile.isdir(FLAGS.save_dir):
gfile.makedirs(FLAGS.save_dir)
hparam_str_dict = json.loads(FLAGS.xm_parameters)
hparam_str = ','.join([
'%s=%s' % (shorten(k), str(hparam_str_dict[k]))
for k in hparam_str_dict.keys()
])
# Number of local devices for this host.
n_devices = jax.local_device_count()
if jax.host_id() == 0:
summary_writer = tensorboard.SummaryWriter(
os.path.join(FLAGS.save_dir, 'tb', hparam_str))
batch_size = FLAGS.per_device_batch_size * n_devices
io_shape = (FLAGS.per_device_batch_size, FLAGS.num_strings_per_task,
FLAGS.max_characters)
predict_io_shape = (FLAGS.per_device_batch_size,
FLAGS.num_strings_per_task,
FLAGS.predict_max_characters)
target_shape = (FLAGS.per_device_batch_size, FLAGS.max_target_length)
# Setup DSL
# ---------------------------------------------------------------------------
# Build token tables.
if FLAGS.dataset_type in ['robust_fill', 'robust_fill_base']:
spec_vocab = robust_fill_dsl.CHARACTER + input_pipeline.SEPARATOR_TOKEN
spec_id_token_table = {
i + 3: token
for i, token in enumerate(spec_vocab)
}
bos_id = 1
eos_id = 2
spec_id_token_table[bos_id] = robust_fill_dsl.BOS
spec_id_token_table[eos_id] = robust_fill_dsl.EOS
spec_token_id_table = {
token: id
for id, token in spec_id_token_table.items()
}
spec_vocab_size = len(spec_token_id_table) + 1 # For padding.
program_id_token_table, _ = dsl_tokens.build_token_tables()
program_vocab_size = len(program_id_token_table) + 1
elif FLAGS.dataset_type == 'scan':
# TODO(jxihong): Scan is not handled yet.
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
else:
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
# Parse io and program token sequences (for eval).
def decode_io(inputs, outputs):
"""Convert from int tensors to strings."""
if FLAGS.dataset_type == 'robust_fill':
def decode_str(s):
"""Decode string tokens."""
return ''.join(
[spec_id_token_table[t_id] for t_id in s if t_id > 0])
inps, outs = [], []
for inp, out in zip(inputs, outputs):
inps.append(decode_str(inp))
outs.append(decode_str(out))
return inps, outs
elif FLAGS.dataset_type == 'scan':
def decode_str(s):
"""Decode string tokens."""
return ' '.join(
[spec_id_token_table[t_id] for t_id in s if t_id > 0])
inps = [decode_str(inp) for inp in inputs]
dummy_outs = [''] * len(inps)
return inps, dummy_outs
else:
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
def decode_spec(target):
"""Convert from int tensor to a string."""
target = target[:np.argmax(target == eos_id)].astype(np.int32)
if FLAGS.dataset_type == 'robust_fill':
target = target[target != bos_id].tolist()
return ''.join(
[spec_id_token_table[t_id] for t_id in target if t_id > 0])
elif FLAGS.dataset_type == 'scan':
# TODO(jxihong): Scan is not handled yet.
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
else:
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
def decode_program(program):
"""Decode program tokens into a program (program object or string)."""
program = program[:np.argmax(program == eos_id) + 1].astype(np.int32)
if FLAGS.dataset_type == 'robust_fill':
# Returns either a Concat program object, or None.
program = program[program != bos_id].tolist()
try:
return robust_fill_dsl.decode_program(program,
program_id_token_table)
except: # pylint: disable=bare-except
return None # Program does not compile.
elif FLAGS.dataset_type == 'scan':
# Returns a string.
program = program[jnp.logical_and(program != bos_id,
program != eos_id)].tolist()
return ' '.join(scan_vocab.decode(program, program_id_token_table))
else:
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
def decode_program_str(program): # pylint: disable=unused-variable
"""Decode program tokens into a string."""
decoded = decode_program(program)
if FLAGS.dataset_type == 'robust_fill':
try:
return decoded.to_string() # pytype: disable=attribute-error
except: # pylint: disable=bare-except
return 'did not compile'
else:
assert isinstance(decoded,
str), '{} should be string'.format(decoded)
return decoded
# Load Dataset
# ---------------------------------------------------------------------------
logging.info('Initializing dataset.')
if not FLAGS.dataset_filepattern:
raise ValueError('Must specify filepattern to dataset.')
# Training dataset.
logging.info('Loading dataset from %s', FLAGS.dataset_filepattern)
padded_shapes = {
'inputs': io_shape[1:],
'outputs': io_shape[1:],
'target': target_shape[1:],
}
logging.info('padded_shapes: %s', padded_shapes)
if FLAGS.dataset_type == 'robust_fill':
if FLAGS.model_type == 'spec_decomposer_model':
create_dataset_fn = input_pipeline.create_robust_fill_dataset_for_spec_decomposer_model
elif FLAGS.model_type == 'synthesizer_model':
create_dataset_fn = input_pipeline.create_robust_fill_dataset_for_synthesizer_model
else:
raise ValueError(f'Unhandled model_type: {FLAGS.model_type}')
elif FLAGS.dataset_type == 'scan':
raise NotImplementedError() # TODO(kshi): Implement.
# create_dataset_fn = input_pipeline.create_scan_dataset_from_tf_record
else:
raise ValueError('Unhandled dataset_type: {}'.format(
FLAGS.dataset_type))
dataset = create_dataset_fn(FLAGS.dataset_filepattern, spec_token_id_table,
FLAGS.num_strings_per_task)
dataset = dataset.padded_batch(batch_size,
padded_shapes=padded_shapes,
drop_remainder=True)
# Split evaluation and training.
eval_ds = dataset.take(FLAGS.num_eval_steps)
# Decrease batch of predict dataset to handle beam search.
predict_padded_shapes = padded_shapes.copy()
predict_padded_shapes['inputs'] = predict_io_shape[1:]
predict_padded_shapes['outputs'] = predict_io_shape[1:]
logging.info('predict_padded_shapes: %s', predict_padded_shapes)
predict_ds = eval_ds.unbatch().padded_batch(
int(np.ceil(batch_size / 10)), padded_shapes=predict_padded_shapes)
train_ds = dataset.skip(FLAGS.num_eval_steps)
if FLAGS.train_set_batches > 0:
train_ds = train_ds.take(FLAGS.train_set_batches)
train_ds = train_ds.repeat()
test_dataset = create_dataset_fn(FLAGS.test_dataset_filepattern,
spec_token_id_table,
FLAGS.num_strings_per_task)
test_dataset = test_dataset.padded_batch(
batch_size, padded_shapes=predict_padded_shapes, drop_remainder=False)
quick_test_dataset = (test_dataset.take(
FLAGS.num_quick_test_steps).unbatch().padded_batch(
int(np.ceil(batch_size / 10)),
padded_shapes=predict_padded_shapes))
final_test_dataset = (test_dataset.take(
FLAGS.num_final_test_steps).unbatch().padded_batch(
int(np.ceil(batch_size / 10)),
padded_shapes=predict_padded_shapes))
# Build Model and Optimizer
# ---------------------------------------------------------------------------
if FLAGS.model_type == 'spec_decomposer_model':
output_vocab_size = spec_vocab_size
elif FLAGS.model_type == 'synthesizer_model':
output_vocab_size = program_vocab_size
else:
raise ValueError(f'Unhandled model_type: {FLAGS.model_type}')
base_config = base_models.TransformerConfig(
vocab_size=spec_vocab_size,
output_vocab_size=output_vocab_size,
shift=True,
emb_dim=FLAGS.embedding_dim,
num_heads=FLAGS.num_heads,
num_layers=FLAGS.num_layers,
qkv_dim=FLAGS.embedding_dim,
mlp_dim=FLAGS.hidden_dim,
max_len=max(FLAGS.max_characters, FLAGS.max_target_length),
dropout_rate=FLAGS.dropout_rate,
attention_dropout_rate=FLAGS.attention_dropout_rate,
use_relative_attention=FLAGS.use_relative_attention,
deterministic=False,
decode=False,
bos_token=bos_id,
num_input_relative_position_buckets=FLAGS.num_position_buckets,
max_input_distance=FLAGS.max_distance,
num_output_relative_position_buckets=FLAGS.num_position_buckets,
max_output_distance=FLAGS.max_distance,
num_input_cross_output_relative_position_buckets=(
FLAGS.num_position_buckets),
max_input_cross_output_distance=FLAGS.max_distance,
num_program_relative_position_buckets=FLAGS.num_position_buckets,
max_program_distance=FLAGS.max_distance,
num_program_cross_embed_relative_position_buckets=(
FLAGS.num_position_buckets),
max_program_cross_embed_distance=FLAGS.
max_program_cross_embed_distance,
num_flat_encoding_relative_position_buckets=(
FLAGS.num_position_buckets),
max_flat_encoding_distance=FLAGS.max_distance)
train_config = models.DecomposeAttentionTransformerConfig(
base_config=base_config,
dataset_type=FLAGS.dataset_type,
flat_encoded_self_attention=FLAGS.flat_encoded_self_attention)
eval_config = train_config.replace(base_config=base_config.replace(
deterministic=True))
predict_config = train_config.replace(base_config=base_config.replace(
shift=False,
deterministic=True,
decode=not FLAGS.slow_decode,
max_len=max(FLAGS.predict_max_characters, FLAGS.max_target_length)))
rng = jax.random.PRNGKey(FLAGS.seed)
rng = jax.random.fold_in(rng, jax.host_id())
rng, init_rng = jax.random.split(rng)
dropout_rng = jax.random.split(rng, jax.local_device_count())
del rng
m = models.DecomposeAttentionTransformer(eval_config)
initial_variables = jax.jit(m.init)(init_rng,
jnp.ones(io_shape, jnp.float32),
jnp.ones(io_shape, jnp.float32),
jnp.ones(target_shape, jnp.float32))
optimizer_def = optim.Adam(FLAGS.lr,
beta1=0.9,
beta2=0.98,
eps=1e-9,
weight_decay=FLAGS.weight_decay)
optimizer = optimizer_def.create(initial_variables['params'])
del initial_variables # Don't keep a copy of the initial model.
start_step = 0
if FLAGS.restore_checkpoints:
# Restore unreplicated optimizer + model state from last checkpoint.
optimizer = checkpoints.restore_checkpoint(
os.path.join(FLAGS.save_dir, 'checkpoints', hparam_str), optimizer)
# Grab last step.
start_step = int(optimizer.state.step)
logging.info('Found model checkpointed at step %d.', start_step)
if FLAGS.finetune_start_step > 0:
logging.info(
'Checking that start_step (%s) == finetune_start_step (%s)',
start_step, FLAGS.finetune_start_step)
assert start_step >= FLAGS.finetune_start_step
steps_to_skip = start_step - FLAGS.finetune_start_step
else:
steps_to_skip = start_step
# TODO(kshi): It is likely that this code can lead to the job stalling for
# 10+ hours when restarting from a checkpoint that had been trained a long
# time, possibly because dataset skipping is slow.
logging.info('Skipping %s steps...', steps_to_skip)
train_ds = train_ds.skip(steps_to_skip)
dummy_p_train_step = jax.pmap(
lambda dropout_rng: jax.random.split(dropout_rng)[1])
for _ in range(steps_to_skip):
dropout_rng = dummy_p_train_step(dropout_rng)
logging.info('Finished skipping steps')
logging.info('Host %s has dropout_rng = %s', jax.host_id(),
dropout_rng)
# Replicate optimizer.
optimizer = jax_utils.replicate(optimizer)
# TODO(jxihong): Implement fast decoding.
assert FLAGS.slow_decode, 'Fast decoding is not implemented yet.'
if FLAGS.finetune_start_step <= 0:
learning_rate_fn = create_learning_rate_scheduler(
base_learning_rate=FLAGS.lr)
else:
# Constant LR for finetuning.
learning_rate_fn = create_learning_rate_scheduler(
base_learning_rate=FLAGS.lr, factors='constant')
p_train_step = jax.pmap(functools.partial(
train_step, learning_rate_fn=learning_rate_fn, config=train_config),
axis_name='batch')
p_eval_step = jax.pmap(functools.partial(eval_step,
eos_token=eos_id,
config=eval_config),
axis_name='batch')
p_init_cache = jax.pmap(functools.partial(
initialize_cache,
max_decode_len=FLAGS.max_target_length,
config=predict_config),
axis_name='batch')
p_pred_step = jax.pmap(functools.partial(
predict_step,
eos_token=eos_id,
max_decode_len=FLAGS.max_target_length,
config=predict_config,
slow_decode=FLAGS.slow_decode),
axis_name='batch',
static_broadcasted_argnums=(4, ))
# Main Train Loop
# ---------------------------------------------------------------------------
logging.info('Starting training!')
metrics_all = []
tick = time.time()
train_iter = train_ds.as_numpy_iterator()
for step in range(start_step, FLAGS.num_train_steps):
inputs, outputs, targets = load_data(next(train_iter))
optimizer, metrics, dropout_rng = p_train_step(optimizer,
inputs,
outputs,
targets,
dropout_rng=dropout_rng)
metrics_all.append(metrics)
is_last_step = step == FLAGS.num_train_steps - 1
# Periodic metric handling.
# Training Metrics
if (step and step % FLAGS.log_freq == 0) or is_last_step:
logging.info('Gathering training metrics.')
metrics_all = common_utils.get_metrics(metrics_all)
lr = metrics_all.pop('learning_rate').mean()
metrics_sums = jax.tree_map(jnp.sum, metrics_all)
denominator = metrics_sums.pop('denominator')
summary = jax.tree_map(
lambda x: x / denominator, # pylint: disable=cell-var-from-loop
metrics_sums)
summary['learning_rate'] = lr
# Calculate (clipped) perplexity after averaging log-perplexities:
summary['perplexity'] = jnp.clip(jnp.exp(summary['loss']),
a_max=1.0e4)
if jax.host_id() == 0:
logging.info('Train in step: %d, loss: %.4f', step,
summary['loss'])
tock = time.time()
steps_per_sec = FLAGS.log_freq / (tock - tick)
tick = tock
summary_writer.scalar('train/steps per second', steps_per_sec,
step)
for key, val in summary.items():
summary_writer.scalar('train/' + key, val, step)
summary_writer.flush()
# Reset metric accumulation for next evaluation cycle.
metrics_all = []
# Evaluation Metrics
if (step and step % FLAGS.eval_freq == 0) or is_last_step:
logging.info('Gathering evaluation metrics.')
t_evaluation_start = time.time()
eval_metrics = []
for batches in eval_ds.as_numpy_iterator():
inputs, outputs, targets = load_data(batches)
metrics = p_eval_step(optimizer.target, inputs, outputs,
targets)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
eval_metrics_sums = jax.tree_map(jnp.sum, eval_metrics)
eval_denominator = eval_metrics_sums.pop('denominator')
eval_summary = jax.tree_map(
lambda x: x / eval_denominator, # pylint: disable=cell-var-from-loop
eval_metrics_sums)
if jax.host_id() == 0:
logging.info('Evaluation time: %.4f s step %d, loss: %.4f.',
time.time() - t_evaluation_start, step,
eval_summary['loss'])
for key, val in eval_summary.items():
summary_writer.scalar('eval/' + key, val, step)
summary_writer.flush()
# Beam search metrics.
if (step and step % FLAGS.predict_freq == 0) or is_last_step:
logging.info('Gathering beam search metrics.')
test_ds = final_test_dataset if is_last_step else quick_test_dataset
for dataset, predict_or_test in [(predict_ds, 'predict'),
(test_ds, 'test')]:
for beam_size in [1, 10]:
t_inference_start = time.time()
total_successes = 0
total_denominator = 0
ios, targets_list, predictions, top_of_beams, scores = ([],
[],
[],
[],
[])
for batches in dataset.as_numpy_iterator():
pred_batch = batches
# Handle final odd-sized batch by padding instead of dropping it.
cur_pred_batch_size = pred_batch['inputs'].shape[0]
if cur_pred_batch_size % n_devices:
padded_size = int(
np.ceil(cur_pred_batch_size / n_devices) *
n_devices)
# pylint: disable=cell-var-from-loop
pred_batch = jax.tree_map(
lambda x: pad_examples(x, padded_size),
pred_batch)
inputs, outputs, targets = load_data(pred_batch)
cache = (p_init_cache(inputs, outputs, targets)
if not FLAGS.slow_decode else None)
predicted = p_pred_step(optimizer.target, inputs,
outputs, cache, beam_size)
predicted = tohost(predicted)
inputs, outputs, targets = map(
tohost, (inputs, outputs, targets))
for i, beams in enumerate(predicted):
inps, outs = decode_io(inputs[i], outputs[i])
if FLAGS.model_type == 'spec_decomposer_model':
ground_truth = decode_spec(targets[i])
best_prediction, score = eval_predicted_spec_decomposer_model(
beams, ground_truth, decode_spec)
decode_to_str_fn = decode_spec
elif FLAGS.model_type == 'synthesizer_model':
ground_truth = decode_program_str(targets[i])
best_prediction, score = eval_predicted_synthesizer_model(
beams, inps, outs, decode_program)
decode_to_str_fn = decode_program_str
else:
raise ValueError(
f'Unknown model type {FLAGS.model_type}')
if score > 0:
total_successes += 1
total_denominator += 1
beams_target = [
decode_to_str_fn(beam) for beam in beams
]
ios.append(' ; '.join(map(str, zip(inps, outs))))
targets_list.append(ground_truth)
predictions.append(best_prediction)
scores.append(score)
logging.info('')
logging.info('ios: %s', ios[-1])
logging.info('targets[%s]: %s', i, targets[i])
logging.info('ground_truth: %s', ground_truth)
logging.info('predicted beam: %s',
'\n'.join(beams_target))
logging.info('best_prediction: %s',
best_prediction)
logging.info('score: %s', score)
logging.info('beams: %s', beams)
if not ground_truth:
logging.warn('ground_truth is empty!')
top_of_beam = []
for index, beam in enumerate(beams[:-5:-1]):
top_of_beam.append(
'index: {}, decoded: {}, tokens: {}'.
format(index, decode_to_str_fn(beam),
beam))
top_of_beams.append('\n\n'.join(top_of_beam))
all_total_successes, all_total_denominator = per_host_sum_pmap(
jax.tree_map(np.array,
(total_successes, total_denominator)))
# Record beam search results as text summaries.
message = []
for n in np.random.choice(np.arange(len(predictions)), 8):
text = (
f'ios: {ios[n]}\n\ntarget: {targets_list[n]}\n\n'
f'predicted: {predictions[n]}\n\n'
f'score: {scores[n]}\n\n'
f'top of beam:\n\n{top_of_beams[n]}\n\n')
message.append(text)
# Write to tensorboard.
if jax.host_id() == 0:
accuracy = 100 * all_total_successes / all_total_denominator
logging.info(
'%s results, step %d, beam size %d: %s / %s = %.2f%% (%.2f s)',
predict_or_test, step, beam_size,
all_total_successes, all_total_denominator,
accuracy,
time.time() - t_inference_start)
summary_writer.scalar(
'{}/beam-size-{}'.format(predict_or_test,
beam_size), accuracy,
step)
summary_writer.text(
'{}-samples-beam-{}'.format(
predict_or_test, beam_size),
'\n------\n'.join(message), step)
summary_writer.flush()
# Save a Checkpoint. Do this at the end of the training loop, so that if a
# worker is descheduled during a round of prediction (which takes a while),
# we will redo prediction upon restarting (to avoid losing data).
if (step % FLAGS.checkpoint_freq == 0 and step > 0) or is_last_step:
if jax.host_id() == 0:
# Save unreplicated optimizer + model state.
checkpoints.save_checkpoint(
os.path.join(FLAGS.save_dir, 'checkpoints', hparam_str),
jax_utils.unreplicate(optimizer), step)
def main():
# See all possible arguments in src/transformers/training_args.py
# or by passing the --help flag to this script.
# We now keep distinct sets of args, for a cleaner separation of concerns.
parser = HfArgumentParser((ModelArguments, DataTrainingArguments, TrainingArguments))
if len(sys.argv) == 2 and sys.argv[1].endswith(".json"):
# If we pass only one argument to the script and it's the path to a json file,
# let's parse it to get our arguments.
model_args, data_args, training_args = parser.parse_json_file(json_file=os.path.abspath(sys.argv[1]))
else:
model_args, data_args, training_args = parser.parse_args_into_dataclasses()
# Make one log on every process with the configuration for debugging.
logging.basicConfig(
format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
level=logging.INFO,
)
# Setup logging, we only want one process per machine to log things on the screen.
logger.setLevel(logging.INFO if jax.process_index() == 0 else logging.ERROR)
if jax.process_index() == 0:
datasets.utils.logging.set_verbosity_warning()
transformers.utils.logging.set_verbosity_info()
else:
datasets.utils.logging.set_verbosity_error()
transformers.utils.logging.set_verbosity_error()
# Get the datasets: you can either provide your own CSV/JSON/TXT training and evaluation files (see below)
# or just provide the name of one of the public datasets for token classification task available on the hub at https://huggingface.co/datasets/
# (the dataset will be downloaded automatically from the datasets Hub).
#
# For CSV/JSON files, this script will use the column called 'tokens' or the first column if no column called
# 'tokens' is found. You can easily tweak this behavior (see below).
#
# In distributed training, the load_dataset function guarantee that only one local process can concurrently
# download the dataset.
if data_args.dataset_name is not None:
# Downloading and loading a dataset from the hub.
raw_datasets = load_dataset(
data_args.dataset_name, data_args.dataset_config_name, cache_dir=model_args.cache_dir
)
else:
# Loading the dataset from local csv or json file.
data_files = {}
if data_args.train_file is not None:
data_files["train"] = data_args.train_file
if data_args.validation_file is not None:
data_files["validation"] = data_args.validation_file
extension = (data_args.train_file if data_args.train_file is not None else data_args.valid_file).split(".")[-1]
raw_datasets = load_dataset(extension, data_files=data_files, cache_dir=model_args.cache_dir)
# See more about loading any type of standard or custom dataset at
# https://huggingface.co/docs/datasets/loading_datasets.html.
if raw_datasets["train"] is not None:
column_names = raw_datasets["train"].column_names
features = raw_datasets["train"].features
else:
column_names = raw_datasets["validation"].column_names
features = raw_datasets["validation"].features
if data_args.text_column_name is not None:
text_column_name = data_args.text_column_name
elif "tokens" in column_names:
text_column_name = "tokens"
else:
text_column_name = column_names[0]
if data_args.label_column_name is not None:
label_column_name = data_args.label_column_name
elif f"{data_args.task_name}_tags" in column_names:
label_column_name = f"{data_args.task_name}_tags"
else:
label_column_name = column_names[1]
# In the event the labels are not a `Sequence[ClassLabel]`, we will need to go through the dataset to get the
# unique labels.
def get_label_list(labels):
unique_labels = set()
for label in labels:
unique_labels = unique_labels | set(label)
label_list = list(unique_labels)
label_list.sort()
return label_list
if isinstance(features[label_column_name].feature, ClassLabel):
label_list = features[label_column_name].feature.names
# No need to convert the labels since they are already ints.
label_to_id = {i: i for i in range(len(label_list))}
else:
label_list = get_label_list(raw_datasets["train"][label_column_name])
label_to_id = {l: i for i, l in enumerate(label_list)}
num_labels = len(label_list)
# Load pretrained model and tokenizer
config = AutoConfig.from_pretrained(
model_args.config_name if model_args.config_name else model_args.model_name_or_path,
num_labels=num_labels,
label2id=label_to_id,
id2label={i: l for l, i in label_to_id.items()},
finetuning_task=data_args.task_name,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
)
tokenizer_name_or_path = model_args.tokenizer_name if model_args.tokenizer_name else model_args.model_name_or_path
if config.model_type in {"gpt2", "roberta"}:
tokenizer = AutoTokenizer.from_pretrained(
tokenizer_name_or_path,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
add_prefix_space=True,
)
else:
tokenizer = AutoTokenizer.from_pretrained(
tokenizer_name_or_path,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
)
model = FlaxAutoModelForTokenClassification.from_pretrained(
model_args.model_name_or_path,
config=config,
cache_dir=model_args.cache_dir,
revision=model_args.model_revision,
use_auth_token=True if model_args.use_auth_token else None,
)
# Preprocessing the datasets
# Tokenize all texts and align the labels with them.
def tokenize_and_align_labels(examples):
tokenized_inputs = tokenizer(
examples[text_column_name],
max_length=data_args.max_seq_length,
padding="max_length",
truncation=True,
# We use this argument because the texts in our dataset are lists of words (with a label for each word).
is_split_into_words=True,
)
labels = []
for i, label in enumerate(examples[label_column_name]):
word_ids = tokenized_inputs.word_ids(batch_index=i)
previous_word_idx = None
label_ids = []
for word_idx in word_ids:
# Special tokens have a word id that is None. We set the label to -100 so they are automatically
# ignored in the loss function.
if word_idx is None:
label_ids.append(-100)
# We set the label for the first token of each word.
elif word_idx != previous_word_idx:
label_ids.append(label_to_id[label[word_idx]])
# For the other tokens in a word, we set the label to either the current label or -100, depending on
# the label_all_tokens flag.
else:
label_ids.append(label_to_id[label[word_idx]] if data_args.label_all_tokens else -100)
previous_word_idx = word_idx
labels.append(label_ids)
tokenized_inputs["labels"] = labels
return tokenized_inputs
processed_raw_datasets = raw_datasets.map(
tokenize_and_align_labels,
batched=True,
num_proc=data_args.preprocessing_num_workers,
load_from_cache_file=not data_args.overwrite_cache,
remove_columns=raw_datasets["train"].column_names,
desc="Running tokenizer on dataset",
)
train_dataset = processed_raw_datasets["train"]
eval_dataset = processed_raw_datasets["validation"]
# Log a few random samples from the training set:
for index in random.sample(range(len(train_dataset)), 3):
logger.info(f"Sample {index} of the training set: {train_dataset[index]}.")
# Define a summary writer
summary_writer = tensorboard.SummaryWriter(training_args.output_dir)
summary_writer.hparams({**training_args.to_dict(), **vars(model_args), **vars(data_args)})
def write_train_metric(summary_writer, train_metrics, train_time, step):
summary_writer.scalar("train_time", train_time, step)
train_metrics = get_metrics(train_metrics)
for key, vals in train_metrics.items():
tag = f"train_{key}"
for i, val in enumerate(vals):
summary_writer.scalar(tag, val, step - len(vals) + i + 1)
def write_eval_metric(summary_writer, eval_metrics, step):
for metric_name, value in eval_metrics.items():
summary_writer.scalar(f"eval_{metric_name}", value, step)
num_epochs = int(training_args.num_train_epochs)
rng = jax.random.PRNGKey(training_args.seed)
dropout_rngs = jax.random.split(rng, jax.local_device_count())
train_batch_size = training_args.per_device_train_batch_size * jax.local_device_count()
eval_batch_size = training_args.per_device_eval_batch_size * jax.local_device_count()
learning_rate_fn = create_learning_rate_fn(
len(train_dataset),
train_batch_size,
training_args.num_train_epochs,
training_args.warmup_steps,
training_args.learning_rate,
)
state = create_train_state(model, learning_rate_fn, num_labels=num_labels, training_args=training_args)
# define step functions
def train_step(
state: train_state.TrainState, batch: Dict[str, Array], dropout_rng: PRNGKey
) -> Tuple[train_state.TrainState, float]:
"""Trains model with an optimizer (both in `state`) on `batch`, returning a pair `(new_state, loss)`."""
dropout_rng, new_dropout_rng = jax.random.split(dropout_rng)
targets = batch.pop("labels")
def loss_fn(params):
logits = state.apply_fn(**batch, params=params, dropout_rng=dropout_rng, train=True)[0]
loss = state.loss_fn(logits, targets)
return loss
grad_fn = jax.value_and_grad(loss_fn)
loss, grad = grad_fn(state.params)
grad = jax.lax.pmean(grad, "batch")
new_state = state.apply_gradients(grads=grad)
metrics = jax.lax.pmean({"loss": loss, "learning_rate": learning_rate_fn(state.step)}, axis_name="batch")
return new_state, metrics, new_dropout_rng
p_train_step = jax.pmap(train_step, axis_name="batch", donate_argnums=(0,))
def eval_step(state, batch):
logits = state.apply_fn(**batch, params=state.params, train=False)[0]
return state.logits_fn(logits)
p_eval_step = jax.pmap(eval_step, axis_name="batch")
metric = load_metric("seqeval")
def get_labels(y_pred, y_true):
# Transform predictions and references tensos to numpy arrays
# Remove ignored index (special tokens)
true_predictions = [
[label_list[p] for (p, l) in zip(pred, gold_label) if l != -100]
for pred, gold_label in zip(y_pred, y_true)
]
true_labels = [
[label_list[l] for (p, l) in zip(pred, gold_label) if l != -100]
for pred, gold_label in zip(y_pred, y_true)
]
return true_predictions, true_labels
def compute_metrics():
results = metric.compute()
if data_args.return_entity_level_metrics:
# Unpack nested dictionaries
final_results = {}
for key, value in results.items():
if isinstance(value, dict):
for n, v in value.items():
final_results[f"{key}_{n}"] = v
else:
final_results[key] = value
return final_results
else:
return {
"precision": results["overall_precision"],
"recall": results["overall_recall"],
"f1": results["overall_f1"],
"accuracy": results["overall_accuracy"],
}
logger.info(f"===== Starting training ({num_epochs} epochs) =====")
train_time = 0
# make sure weights are replicated on each device
state = replicate(state)
train_time = 0
step_per_epoch = len(train_dataset) // train_batch_size
total_steps = step_per_epoch * num_epochs
epochs = tqdm(range(num_epochs), desc=f"Epoch ... (1/{num_epochs})", position=0)
for epoch in epochs:
train_start = time.time()
train_metrics = []
# Create sampling rng
rng, input_rng = jax.random.split(rng)
# train
for step, batch in enumerate(
tqdm(
train_data_collator(input_rng, train_dataset, train_batch_size),
total=step_per_epoch,
desc="Training...",
position=1,
)
):
state, train_metric, dropout_rngs = p_train_step(state, batch, dropout_rngs)
train_metrics.append(train_metric)
cur_step = epoch * step_per_epoch + step
if cur_step % training_args.logging_steps == 0 and cur_step > 0:
# Save metrics
train_metric = unreplicate(train_metric)
train_time += time.time() - train_start
if jax.process_index() == 0:
write_train_metric(summary_writer, train_metrics, train_time, cur_step)
epochs.write(
f"Step... ({cur_step}/{total_steps} | Training Loss: {train_metric['loss']}, Learning Rate: {train_metric['learning_rate']})"
)
train_metrics = []
if cur_step % training_args.eval_steps == 0 and cur_step > 0:
eval_metrics = {}
# evaluate
for batch in tqdm(
eval_data_collator(eval_dataset, eval_batch_size),
total=len(eval_dataset) // eval_batch_size,
desc="Evaluating ...",
position=2,
):
labels = batch.pop("labels")
predictions = p_eval_step(state, batch)
predictions = np.array([pred for pred in chain(*predictions)])
labels = np.array([label for label in chain(*labels)])
labels[np.array(chain(*batch["attention_mask"])) == 0] = -100
preds, refs = get_labels(predictions, labels)
metric.add_batch(
predictions=preds,
references=refs,
)
# evaluate also on leftover examples (not divisible by batch_size)
num_leftover_samples = len(eval_dataset) % eval_batch_size
# make sure leftover batch is evaluated on one device
if num_leftover_samples > 0 and jax.process_index() == 0:
# take leftover samples
batch = eval_dataset[-num_leftover_samples:]
batch = {k: np.array(v) for k, v in batch.items()}
labels = batch.pop("labels")
predictions = eval_step(unreplicate(state), batch)
labels = np.array(labels)
labels[np.array(batch["attention_mask"]) == 0] = -100
preds, refs = get_labels(predictions, labels)
metric.add_batch(
predictions=preds,
references=refs,
)
eval_metrics = compute_metrics()
if data_args.return_entity_level_metrics:
logger.info(f"Step... ({cur_step}/{total_steps} | Validation metrics: {eval_metrics}")
else:
logger.info(
f"Step... ({cur_step}/{total_steps} | Validation f1: {eval_metrics['f1']}, Validation Acc: {eval_metrics['accuracy']})"
)
if jax.process_index() == 0:
write_eval_metric(summary_writer, eval_metrics, cur_step)
if (cur_step % training_args.save_steps == 0 and cur_step > 0) or (cur_step == total_steps):
# save checkpoint after each epoch and push checkpoint to the hub
if jax.process_index() == 0:
params = jax.device_get(unreplicate(state.params))
model.save_pretrained(
training_args.output_dir,
params=params,
push_to_hub=training_args.push_to_hub,
commit_message=f"Saving weights and logs of step {cur_step}",
)
epochs.desc = f"Epoch ... {epoch + 1}/{num_epochs}"
def train(model_def,
model_dir,
batch_size,
num_epochs,
learning_rate,
sgd_momentum,
make_lr_fun=None,
l2_reg=0.0005,
run_seed=0):
"""Train model."""
if jax.host_count() > 1:
raise ValueError('CIFAR-10 example should not be run on '
'more than 1 host (for now)')
if make_lr_fun is None:
# No learning rate function provided
# Default to stepped LR schedule for CIFAR-10 and Wide ResNet
def make_lr_fun(base_lr, steps_per_epoch): # pylint: disable=function-redefined
return lr_schedule.create_stepped_learning_rate_schedule(
base_lr, steps_per_epoch,
[[60, 0.2], [120, 0.04], [160, 0.008]])
summary_writer = tensorboard.SummaryWriter(model_dir)
rng = random.PRNGKey(run_seed)
if batch_size % jax.device_count() > 0:
raise ValueError(
'Batch size must be divisible by the number of devices')
device_batch_size = batch_size // jax.device_count()
# Load dataset
data_source = input_pipeline.CIFAR10DataSource(train_batch_size=batch_size,
eval_batch_size=batch_size)
train_ds = data_source.train_ds
eval_ds = data_source.eval_ds
# Compute steps per epoch and nb of eval steps
steps_per_epoch = data_source.TRAIN_IMAGES // batch_size
steps_per_eval = data_source.EVAL_IMAGES // batch_size
num_steps = steps_per_epoch * num_epochs
base_learning_rate = learning_rate
# Create the model
image_size = 32
model, state = create_model(rng, device_batch_size, image_size, model_def)
state = jax_utils.replicate(state)
optimizer = create_optimizer(model, base_learning_rate, sgd_momentum)
del model # don't keep a copy of the initial model
# Learning rate schedule
learning_rate_fn = make_lr_fun(base_learning_rate, steps_per_epoch)
# pmap the train and eval functions
p_train_step = jax.pmap(functools.partial(
train_step, learning_rate_fn=learning_rate_fn, l2_reg=l2_reg),
axis_name='batch')
p_eval_step = jax.pmap(eval_step, axis_name='batch')
# Create dataset batch iterators
train_iter = iter(train_ds)
eval_iter = iter(eval_ds)
# Gather metrics
train_metrics = []
epoch = 1
for step, batch in zip(range(num_steps), train_iter):
# Generate a PRNG key that will be rolled into the batch
rng, step_key = jax.random.split(rng)
# Load and shard the TF batch
batch = load_and_shard_tf_batch(batch)
# Shard the step PRNG key
sharded_keys = common_utils.shard_prng_key(step_key)
# Train step
optimizer, state, metrics = p_train_step(optimizer, state, batch,
sharded_keys)
train_metrics.append(metrics)
if (step + 1) % steps_per_epoch == 0:
# We've finished an epoch
train_metrics = common_utils.get_metrics(train_metrics)
# Get training epoch summary for logging
train_summary = jax.tree_map(lambda x: x.mean(), train_metrics)
# Send stats to Tensorboard
for key, vals in train_metrics.items():
tag = 'train_%s' % key
for i, val in enumerate(vals):
summary_writer.scalar(tag, val, step - len(vals) + i + 1)
# Reset train metrics
train_metrics = []
# Evaluation
eval_metrics = []
for _ in range(steps_per_eval):
eval_batch = next(eval_iter)
# Load and shard the TF batch
eval_batch = load_and_shard_tf_batch(eval_batch)
# Step
metrics = p_eval_step(optimizer.target, state, eval_batch)
eval_metrics.append(metrics)
eval_metrics = common_utils.get_metrics(eval_metrics)
# Get eval epoch summary for logging
eval_summary = jax.tree_map(lambda x: x.mean(), eval_metrics)
# Log epoch summary
logging.info(
'Epoch %d: TRAIN loss=%.6f, err=%.2f, EVAL loss=%.6f, err=%.2f',
epoch, train_summary['loss'],
train_summary['error_rate'] * 100.0, eval_summary['loss'],
eval_summary['error_rate'] * 100.0)
summary_writer.scalar('eval_loss', eval_summary['loss'], epoch)
summary_writer.scalar('eval_error_rate',
eval_summary['error_rate'], epoch)
summary_writer.flush()
epoch += 1
def main(args):
logdir = os.path.join(args.logdir, args.name)
logger = logging.setup_logger(logdir)
logger.info(args)
logger.info(f'Available devices: {jax.devices()}')
# Setup input pipeline
dataset_info = input_pipeline.get_dataset_info(args.dataset, 'train')
ds_train = input_pipeline.get_data(dataset=args.dataset,
mode='train',
repeats=None,
mixup_alpha=args.mixup_alpha,
batch_size=args.batch,
shuffle_buffer=args.shuffle_buffer,
tfds_data_dir=args.tfds_data_dir,
tfds_manual_dir=args.tfds_manual_dir)
batch = next(iter(ds_train))
logger.info(ds_train)
ds_test = input_pipeline.get_data(dataset=args.dataset,
mode='test',
repeats=1,
batch_size=args.batch_eval,
tfds_data_dir=args.tfds_data_dir,
tfds_manual_dir=args.tfds_manual_dir)
logger.info(ds_test)
# Build VisionTransformer architecture
model = models.KNOWN_MODELS[args.model]
VisionTransformer = model.partial(num_classes=dataset_info['num_classes'])
_, params = VisionTransformer.init_by_shape(
jax.random.PRNGKey(0),
# Discard the "num_local_devices" dimension for initialization.
[(batch['image'].shape[1:], batch['image'].dtype.name)])
pretrained_path = os.path.join(args.vit_pretrained_dir,
f'{args.model}.npz')
params = checkpoint.load_pretrained(
pretrained_path=pretrained_path,
init_params=params,
model_config=models.CONFIGS[args.model],
logger=logger)
# pmap replicates the models over all TPUs/GPUs
vit_fn_repl = jax.pmap(VisionTransformer.call)
update_fn_repl = make_update_fn(VisionTransformer.call, args.accum_steps)
# Create optimizer and replicate it over all TPUs/GPUs
opt = momentum_clip.Optimizer(
dtype=args.optim_dtype,
grad_norm_clip=args.grad_norm_clip).create(params)
opt_repl = flax_utils.replicate(opt)
# Delete referenes to the objects that are not needed anymore
del opt
del params
def copyfiles(paths):
"""Small helper to copy files to args.copy_to using tf.io.gfile."""
if not args.copy_to:
return
for path in paths:
to_path = os.path.join(args.copy_to, args.name,
os.path.basename(path))
tf.io.gfile.makedirs(os.path.dirname(to_path))
tf.io.gfile.copy(path, to_path, overwrite=True)
logger.info(f'Copied {path} to {to_path}.')
total_steps = args.total_steps or (
input_pipeline.DATASET_PRESETS[args.dataset]['total_steps'])
# Prepare the learning-rate and pre-fetch it to device to avoid delays.
lr_fn = hyper.create_learning_rate_schedule(total_steps, args.base_lr,
args.decay_type,
args.warmup_steps)
lr_iter = hyper.lr_prefetch_iter(lr_fn, 0, total_steps)
update_rngs = jax.random.split(jax.random.PRNGKey(0),
jax.local_device_count())
# Run training loop
writer = metric_writers.create_default_writer(logdir, asynchronous=False)
writer.write_hparams(
{k: v
for k, v in vars(args).items() if v is not None})
logger.info('Starting training loop; initial compile can take a while...')
t0 = time.time()
for step, batch, lr_repl in zip(
range(1, total_steps + 1),
input_pipeline.prefetch(ds_train, args.prefetch), lr_iter):
opt_repl, loss_repl, update_rngs = update_fn_repl(
opt_repl, lr_repl, batch, update_rngs)
if step == 1:
logger.info(f'First step took {time.time() - t0:.1f} seconds.')
t0 = time.time()
if args.progress_every and step % args.progress_every == 0:
writer.write_scalars(step, dict(train_loss=float(loss_repl[0])))
done = step / total_steps
logger.info(f'Step: {step}/{total_steps} {100*done:.1f}%, '
f'ETA: {(time.time()-t0)/done*(1-done)/3600:.2f}h')
copyfiles(glob.glob(f'{logdir}/*'))
# Run eval step
if ((args.eval_every and step % args.eval_every == 0)
or (step == total_steps)):
accuracy_test = np.mean([
c for batch in input_pipeline.prefetch(ds_test, args.prefetch)
for c in (np.argmax(
vit_fn_repl(opt_repl.target, batch['image']), axis=2) ==
np.argmax(batch['label'], axis=2)).ravel()
])
lr = float(lr_repl[0])
logger.info(f'Step: {step} '
f'Learning rate: {lr:.7f}, '
f'Test accuracy: {accuracy_test:0.5f}')
writer.write_scalars(step, dict(accuracy_test=accuracy_test,
lr=lr))
copyfiles(glob.glob(f'{logdir}/*'))
if args.output:
checkpoint.save(flax_utils.unreplicate(opt_repl.target), args.output)
logger.info(f'Stored fine tuned checkpoint to {args.output}')
copyfiles([args.output])
def train(config, workdir):
"""Runs a training loop.
Args:
config: Configuration to use.
workdir: Working directory for checkpoints and TF summaries. If this
contains checkpoint training will be resumed from the latest checkpoint.
"""
# Create directories for experimental logs
tf.io.gfile.makedirs(workdir)
sample_dir = os.path.join(workdir, "samples")
tf.io.gfile.makedirs(sample_dir)
rng = jax.random.PRNGKey(config.seed)
tb_dir = os.path.join(workdir, "tensorboard")
tf.io.gfile.makedirs(tb_dir)
if jax.host_id() == 0:
writer = tensorboard.SummaryWriter(tb_dir)
# Initialize model.
rng, model_rng = jax.random.split(rng)
model_name = config.model.name
ncsn_def = mutils.get_model(model_name).partial(config=config)
rng, run_rng = jax.random.split(rng)
# Whether the generative model is conditioned on class labels
class_conditional = "conditional" in config.training.loss.lower()
with nn.stateful() as init_model_state:
with nn.stochastic(run_rng):
input_shape = (jax.local_device_count(), config.data.image_size,
config.data.image_size, 3)
input_list = [(input_shape, jnp.float32),
(input_shape[:1], jnp.int32)]
if class_conditional:
input_list.append(input_list[-1])
_, initial_params = ncsn_def.init_by_shape(model_rng,
input_list,
train=True)
ncsn = nn.Model(ncsn_def, initial_params)
optimizer = losses.get_optimizer(config).create(ncsn)
state = mutils.State(step=0,
optimizer=optimizer,
lr=config.optim.lr,
model_state=init_model_state,
ema_rate=config.model.ema_rate,
params_ema=initial_params,
rng=rng) # pytype: disable=wrong-keyword-args
del ncsn, init_model_state # Do not keep a copy of the initial model.
# Create checkpoints directory and the initial checkpoint
checkpoint_dir = os.path.join(workdir, "checkpoints")
ckpt = utils.Checkpoint(checkpoint_dir, max_to_keep=None)
ckpt.restore_or_initialize(state)
# Save intermediate checkpoints to resume training automatically
checkpoint_meta_dir = os.path.join(workdir, "checkpoints-meta")
ckpt_meta = utils.Checkpoint(checkpoint_meta_dir, max_to_keep=1)
state = ckpt_meta.restore_or_initialize(state)
initial_step = int(state.step)
rng = state.rng
# Build input pipeline.
rng, ds_rng = jax.random.split(rng)
train_ds, eval_ds, _ = datasets.get_dataset(ds_rng, config)
train_iter = iter(train_ds) # pytype: disable=wrong-arg-types
eval_iter = iter(eval_ds) # pytype: disable=wrong-arg-types
scaler = datasets.get_data_scaler(config) # data normalizer
inverse_scaler = datasets.get_data_inverse_scaler(config)
# Distribute training.
optimize_fn = losses.optimization_manager(config)
if config.training.loss.lower() == "ddpm":
# Use score matching loss with DDPM-type perturbation.
ddpm_params = mutils.get_ddpm_params()
train_step = functools.partial(losses.ddpm_loss,
ddpm_params=ddpm_params,
train=True,
optimize_fn=optimize_fn)
eval_step = functools.partial(losses.ddpm_loss,
ddpm_params=ddpm_params,
train=False)
else:
# Use score matching loss with NCSN-type perturbation.
sigmas = mutils.get_sigmas(config)
# Whether to use a continuous distribution of noise levels
continuous = "continuous" in config.training.loss.lower()
train_step = functools.partial(
losses.ncsn_loss,
sigmas=sigmas,
class_conditional=class_conditional,
continuous=continuous,
train=True,
optimize_fn=optimize_fn,
anneal_power=config.training.anneal_power)
eval_step = functools.partial(
losses.ncsn_loss,
sigmas=sigmas,
class_conditional=class_conditional,
continuous=continuous,
train=False,
anneal_power=config.training.anneal_power)
p_train_step = jax.pmap(train_step, axis_name="batch")
p_eval_step = jax.pmap(eval_step, axis_name="batch")
state = flax_utils.replicate(state)
num_train_steps = config.training.n_iters
logging.info("Starting training loop at step %d.", initial_step)
rng = jax.random.fold_in(rng, jax.host_id())
for step in range(initial_step, num_train_steps + 1):
# `step` is a Python integer. `state.step` is JAX integer on the GPU/TPU
# devices.
# Convert data to JAX arrays. Use ._numpy() to avoid copy.
batch = jax.tree_map(lambda x: scaler(x._numpy()), next(train_iter)) # pylint: disable=protected-access
rng, *next_rng = jax.random.split(rng,
num=jax.local_device_count() + 1)
next_rng = jnp.asarray(next_rng)
loss, state = p_train_step(next_rng, state, batch)
loss = flax.jax_utils.unreplicate(loss)
# Quick indication that training is happening.
logging.log_first_n(logging.INFO, "Finished training step %d.", 5,
step)
if jax.host_id() == 0 and step % 50 == 0:
logging.info("step: %d, training_loss: %.5e", step, loss)
writer.scalar("training_loss", loss, step)
# Save a temporary checkpoint to resume training after pre-emption.
if step % config.training.snapshot_freq_for_preemption == 0 and jax.host_id(
) == 0:
saved_state = flax_utils.unreplicate(state)
saved_state = saved_state.replace(rng=rng)
ckpt_meta.save(saved_state)
# Report the loss on an evaluation dataset.
if step % 100 == 0:
rng, *next_rng = jax.random.split(rng,
num=jax.local_device_count() + 1)
next_rng = jnp.asarray(next_rng)
eval_batch = jax.tree_map(lambda x: scaler(x._numpy()),
next(eval_iter)) # pylint: disable=protected-access
eval_loss, _ = p_eval_step(next_rng, state, eval_batch)
eval_loss = flax.jax_utils.unreplicate(eval_loss)
if jax.host_id() == 0:
logging.info("step: %d, eval_loss: %.5e", step, eval_loss)
writer.scalar("eval_loss", eval_loss, step)
# Save a checkpoint periodically and generate samples.
if (step + 1
) % config.training.snapshot_freq == 0 or step == num_train_steps:
# Save the checkpoint.
if jax.host_id() == 0:
saved_state = flax_utils.unreplicate(state)
saved_state = saved_state.replace(rng=rng)
ckpt.save(saved_state)
# Generate and save samples
if config.training.snapshot_sampling:
rng, sample_rng = jax.random.split(rng)
init_shape = tuple(train_ds.element_spec["image"].shape)
samples = sampling.get_samples(
sample_rng,
config,
flax_utils.unreplicate(state),
init_shape,
scaler,
inverse_scaler,
class_conditional=class_conditional)
this_sample_dir = os.path.join(
sample_dir, "iter_{}_host_{}".format(step, jax.host_id()))
tf.io.gfile.makedirs(this_sample_dir)
if config.sampling.final_only: # Do not save intermediate samples
sample = samples[-1]
image_grid = sample.reshape((-1, *sample.shape[2:]))
nrow = int(np.sqrt(image_grid.shape[0]))
sample = np.clip(sample * 255, 0, 255).astype(np.uint8)
with tf.io.gfile.GFile(
os.path.join(this_sample_dir, "sample.np"),
"wb") as fout:
np.save(fout, sample)
with tf.io.gfile.GFile(
os.path.join(this_sample_dir, "sample.png"),
"wb") as fout:
utils.save_image(image_grid,
fout,
nrow=nrow,
padding=2)
else: # Save all intermediate samples produced during sampling.
for i, sample in enumerate(samples):
image_grid = sample.reshape((-1, *sample.shape[2:]))
nrow = int(np.sqrt(image_grid.shape[0]))
sample = np.clip(sample * 255, 0, 255).astype(np.uint8)
with tf.io.gfile.GFile(
os.path.join(this_sample_dir,
"sample_{}.np".format(i)),
"wb") as fout:
np.save(fout, sample)
with tf.io.gfile.GFile(
os.path.join(this_sample_dir,
"sample_{}.png".format(i)),
"wb") as fout:
utils.save_image(image_grid,
fout,
nrow=nrow,
padding=2)
