def get_loaders():
svhn, mnist = get_datasets(is_training=True)
val_svhn, val_mnist = get_datasets(is_training=False)
train_dataset = svhn if DATA == 'svhn' else mnist
weights = make_weights_for_balanced_classes(train_dataset, num_classes=10)
sampler = WeightedRandomSampler(weights, len(weights))
train_loader = DataLoader(train_dataset,
BATCH_SIZE,
sampler=sampler,
pin_memory=True,
drop_last=True)
val_svhn_loader = DataLoader(val_svhn,
BATCH_SIZE,
shuffle=False,
drop_last=False)
val_mnist_loader = DataLoader(val_mnist,
BATCH_SIZE,
shuffle=False,
drop_last=False)
return train_loader, val_svhn_loader, val_mnist_loader
def _get_datasets(self):
config = default.get_config()
config.per_device_batch_size = 1
config.eval_per_device_batch_size = 2
config.vocab_size = 32
config.max_corpus_chars = 1000
config.max_target_length = _TARGET_LENGTH
config.max_eval_target_length = _EVAL_TARGET_LENGTH
config.max_predict_length = _PREDICT_TARGET_LENGTH
vocab_path = os.path.join(tempfile.mkdtemp(), 'sentencepiece_model')
# Go two directories up to the root of the flax directory.
flax_root_dir = pathlib.Path(__file__).parents[2]
data_dir = str(flax_root_dir) + '/.tfds/metadata' # pylint: disable=unused-variable
with tfds.testing.mock_data(num_examples=128, data_dir=data_dir):
train_ds, eval_ds, predict_ds, _ = input_pipeline.get_datasets(
n_devices=2, config=config, vocab_path=vocab_path)
return train_ds, eval_ds, predict_ds
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))
learning_rate_fn = create_learning_rate_schedule(
learning_rate=config.learning_rate, warmup_steps=config.warmup_steps)
optimizer = optax.adamw(learning_rate_fn,
b1=0.9,
b2=0.98,
eps=1e-9,
weight_decay=config.weight_decay)
state = train_state.TrainState.create(apply_fn=m.apply,
params=initial_variables["params"],
tx=optimizer)
# We access model params only from optimizer below.
del initial_variables
if config.restore_checkpoints:
# Restore unreplicated optimizer + model state from last checkpoint.
state = checkpoints.restore_checkpoint(workdir, state)
# Grab last step.
start_step = int(state.step)
writer = metric_writers.create_default_writer(
workdir, just_logging=jax.process_index() > 0)
if start_step == 0:
writer.write_hparams(dict(config))
# Replicate optimizer.
state = jax_utils.replicate(state)
# 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.process_index() == 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.StepTraceAnnotation("train", step_num=step):
batch = common_utils.shard(
jax.tree_map(np.asarray, next(train_iter)))
state, metrics = p_train_step(state,
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,
params=state.params,
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,
params=state.params,
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.process_index(
) == 0:
with report_progress.timed("checkpoint"):
checkpoints.save_checkpoint(workdir,
jax_utils.unreplicate(state),
step)
def train_and_evaluate():
svhn, mnist = get_datasets(is_training=True)
source_dataset = svhn if SOURCE_DATA == 'svhn' else mnist
target_dataset = mnist if SOURCE_DATA == 'svhn' else svhn
weights = make_weights_for_balanced_classes(source_dataset, num_classes=10)
sampler = WeightedRandomSampler(weights, len(weights))
source_loader = DataLoader(source_dataset,
BATCH_SIZE,
sampler=sampler,
pin_memory=True,
drop_last=True)
target_loader = DataLoader(target_dataset,
BATCH_SIZE,
shuffle=True,
pin_memory=True,
drop_last=True)
val_svhn, val_mnist = get_datasets(is_training=False)
val_svhn_loader = DataLoader(val_svhn,
BATCH_SIZE,
shuffle=False,
drop_last=False)
val_mnist_loader = DataLoader(val_mnist,
BATCH_SIZE,
shuffle=False,
drop_last=False)
print('\nsource dataset is', SOURCE_DATA, '\n')
num_steps_per_epoch = math.floor(min(len(svhn), len(mnist)) / BATCH_SIZE)
embedder = Network(image_size=(32, 32),
embedding_dim=EMBEDDING_DIM).to(DEVICE)
classifier = nn.Linear(EMBEDDING_DIM, 10).to(DEVICE)
model = nn.Sequential(embedder, classifier)
model.train()
optimizer = optim.Adam(lr=1e-3,
params=model.parameters(),
weight_decay=1e-3)
scheduler = CosineAnnealingLR(optimizer,
T_max=num_steps_per_epoch * NUM_EPOCHS -
DELAY,
eta_min=1e-6)
cross_entropy = nn.CrossEntropyLoss()
association = WalkerVisitLosses()
text = 'e:{0:2d}, i:{1:3d}, classification loss: {2:.3f}, ' +\
'walker loss: {3:.3f}, visit loss: {4:.4f}, ' +\
'total loss: {5:.3f}, lr: {6:.6f}'
logs, val_logs = [], []
i = 0 # iteration
for e in range(NUM_EPOCHS):
model.train()
for (x_source, y_source), (x_target, _) in zip(source_loader,
target_loader):
x_source = x_source.to(DEVICE)
x_target = x_target.to(DEVICE)
y_source = y_source.to(DEVICE)
x = torch.cat([x_source, x_target], dim=0)
embeddings = embedder(x)
a, b = torch.split(embeddings, BATCH_SIZE, dim=0)
logits = classifier(a)
usual_loss = cross_entropy(logits, y_source)
walker_loss, visit_loss = association(a, b, y_source)
if i > DELAY:
growth = torch.clamp(
torch.tensor((i - DELAY) / GROWTH_STEPS).to(DEVICE), 0.0,
1.0)
loss = usual_loss + growth * (BETA1 * walker_loss +
BETA2 * visit_loss)
else:
loss = usual_loss
optimizer.zero_grad()
loss.backward()
optimizer.step()
if i > DELAY:
scheduler.step()
lr = scheduler.get_lr()[0]
log = (e, i, usual_loss.item(), walker_loss.item(),
visit_loss.item(), loss.item(), lr)
print(text.format(*log))
logs.append(log)
i += 1
result1 = evaluate(model, cross_entropy, val_svhn_loader, DEVICE)
result2 = evaluate(model, cross_entropy, val_mnist_loader, DEVICE)
print('\nsvhn loss {0:.3f} and accuracy {1:.3f}'.format(*result1))
print('mnist loss {0:.3f} and accuracy {1:.3f}\n'.format(*result2))
val_logs.append((i, ) + result1 + result2)
torch.save(model.state_dict(), SAVE_PATH)
write_logs(logs, val_logs, LOGS_PATH)
import sys
sys.path.append("./long-range-arena/lra_benchmarks/listops/")
import input_pipeline
import numpy as np
import pickle
train_ds, eval_ds, test_ds, encoder = input_pipeline.get_datasets(
n_devices=1,
task_name="basic",
data_dir="./lra_release/lra_release/listops-1000/",
batch_size=1,
max_length=2000)
mapping = {"train": train_ds, "dev": eval_ds, "test": test_ds}
for component in mapping:
ds_list = []
for idx, inst in enumerate(iter(mapping[component])):
ds_list.append({
"input_ids_0":
np.concatenate(
[inst["inputs"].numpy()[0],
np.zeros(48, dtype=np.int32)]),
"label":
inst["targets"].numpy()[0]
})
if idx % 100 == 0:
print(f"{idx}\t\t", end="\r")
with open(f"listops.{component}.pickle", "wb") as f:
pickle.dump(ds_list, f)