def main():
parser = argparse.ArgumentParser()
parser.add_argument("--data-path", type=str, default="gs://openqa-dpr/data/reader/nq/dev/dev.tfrecord")
parser.add_argument("--max-sequence-length", type=int, default=256)
parser.add_argument("--tpu", type=str, default="tpu-v3")
parser.add_argument("--pretrained-model", type=str, default="bert-base-uncased")
parser.add_argument("--batch-size", type=int, default=128)
parser.add_argument("--checkpoint-path", type=str, default="gs://openqa-dpr/checkpoints/reader/baseline")
parser.add_argument("--disable-tf-function", type=eval, default=False)
parser.add_argument("--max-answer-length", type=int, default=10)
parser.add_argument("--res-dir", type=str, default="results/reader")
parser.add_argument("--pretrained-model", type=str, default='bert-base-uncased')
parser.add_argument("--prefix", type=str, default='pretrained')
global args
args = parser.parse_args()
args_dict = args.__dict__
checkpoint_type = os.path.basename(args.checkpoint_path)
args_dict['res_dir'] = os.path.join(args_dict['res_dir'], checkpoint_type)
configs = ["{}: {}".format(k, v) for k, v in args_dict.items()]
configs_string = "\t" + "\n\t".join(configs) + "\n"
print("************************* Configurations *************************")
print(configs_string)
print("----------------------------------------------------------------------------------------------------------------------")
config_path = "configs/{}/{}/config.yml".format(os.path.basename(__file__).rstrip(".py"), datetime.now().strftime("%Y-%m-%d %H-%M-%S"))
write_config(config_path, args_dict)
try: # detect TPUs
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(tpu=args.tpu) # TPU detection
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
except Exception: # detect GPUs
devices = tf.config.list_physical_devices("GPU")
# [tf.config.experimental.set_memory_growth(device, True) for device in devices]
if devices:
strategy = tf.distribute.MirroredStrategy()
else:
strategy = tf.distribute.get_strategy()
dataset = load_dataset(data_path=args.data_path, strategy=strategy)
reader = load_checkpoint(
pretrained_model=args.pretrained_model,
checkpoint_path=args.checkpoint_path,
strategy=strategy
)
em_hits, match_stats = validate(
reader=reader,
strategy=strategy,
dataset=dataset
)
save_results(em_hits=em_hits, match_stats=match_stats, out_dir=args.res_dir)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--checkpoint-path", type=str, default=const.CHECKPOINT_PATH)
parser.add_argument("--ctx-source-shards-tfrecord", type=str, default=const.CTX_SOURCE_SHARDS_TFRECORD)
parser.add_argument("--records-per-file", type=int, default=const.RECORDS_PER_FILE)
parser.add_argument("--embeddings-path", type=str, default=const.EMBEDDINGS_DIR)
parser.add_argument("--seed", type=int, default=const.SHUFFLE_SEED)
parser.add_argument("--batch-size", type=int, default=const.EVAL_BATCH_SIZE)
parser.add_argument("--tpu", type=str, default=const.TPU_NAME)
parser.add_argument("--max-context-length", type=int, default=const.MAX_CONTEXT_LENGTH, help="Maximum length of a document")
parser.add_argument("--pretrained-model", type=str, default=const.PRETRAINED_MODEL)
parser.add_argument("--use-pooler", type=eval, default=True)
parser.add_argument("--disable-tf-function", type=eval, default=False)
parser.add_argument("--prefix", type=str, default='pretrained')
global args
args = parser.parse_args()
model_type = os.path.basename(args.checkpoint_path)
embeddings_path = os.path.join(args.embeddings_path, "shards-42031", model_type)
args_dict = {**args.__dict__, "embeddings_path": embeddings_path}
configs = ["{}: {}".format(k, v) for k, v in args_dict.items()]
configs_string = "\t" + "\n\t".join(configs) + "\n"
print("************************* Configurations *************************")
print(configs_string)
print("----------------------------------------------------------------------------------------------------------------------")
config_path = "configs/{}/{}/config.yml".format(__file__.rstrip(".py"), datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
write_config(config_path, args_dict)
try: # detect TPUs
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(tpu=args.tpu) # TPU detection
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
except Exception: # detect GPUs
devices = tf.config.list_physical_devices("GPU")
# [tf.config.experimental.set_memory_growth(device, True) for device in devices]
if devices:
strategy = tf.distribute.MirroredStrategy(["GPU:0"])
else:
strategy = tf.distribute.get_strategy()
tf.random.set_seed(args.seed)
"""
Data pipeline
"""
print("Data pipeline processing...")
dataset = biencoder_manipulator.load_tfrecord_tokenized_data_for_ctx_sources(
input_path=args.ctx_source_shards_tfrecord,
max_context_length=args.max_context_length
)
dataset = dataset.batch(args.batch_size)
dataset = dataset.prefetch(buffer_size=tf.data.AUTOTUNE)
# Distribute the dataset
dist_dataset = strategy.distribute_datasets_from_function(
lambda _: dataset
)
print("done")
print("----------------------------------------------------------------------------------------------------------------------")
"""
Load checkpoint
"""
print("Loading checkpoint...")
checkpoint_path = args.checkpoint_path
with strategy.scope():
context_encoder = get_encoder(
model_name=args.pretrained_model,
args=args,
trainable=False,
prefix=args.prefix
)
retriever = tf.train.Checkpoint(ctx_model=context_encoder)
root_ckpt = tf.train.Checkpoint(model=retriever)
root_ckpt.restore(tf.train.latest_checkpoint(checkpoint_path)).expect_partial()
print(tf.train.latest_checkpoint(checkpoint_path))
print("done")
print("----------------------------------------------------------------------------------------------------------------------")
"""
Generate embeddings
"""
print("Generate embeddings...")
out_dir = embeddings_path
if not os.path.exists(out_dir):
os.makedirs(out_dir)
run(
dataset=dist_dataset,
strategy=strategy,
context_encoder=context_encoder,
out_dir=out_dir
)
print("done")
print("----------------------------------------------------------------------------------------------------------------------")
w_min_df = 3
w_max_df = 0.9
w_strip_accents = 'unicode'
w_use_idf = 1
w_smooth_idf = 1
w_sublinear_tf = 1
c_sublinear_tf = True
c_lowercase = False
c_strip_accents = 'unicode'
c_analyzer = 'char'
c_ngram_range = (5, 6)
c_max_features = 50000
cfg = Config()
write_config(Config)
if not os.path.exists(cfg.root + cfg.model_name):
os.mkdir(cfg.root + cfg.model_name)
train = pd.read_csv(cfg.train_fn, index_col=0)
test = pd.read_csv(TEST_FILENAME, index_col=0)
subm = pd.read_csv(SAMPLE_SUBMISSION_FILENAME)
train['none'] = 1 - train[LIST_CLASSES].max(axis=1)
train[COMMENT].fillna(NAN_WORD, inplace=True)
test[COMMENT].fillna(NAN_WORD, inplace=True)
if cfg.do_preprocess:
train = preprocess(train)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--train-data-size", type=int, default=263011)
parser.add_argument("--data-path",
type=str,
default="gs://openqa-dpr/data/reader/nq/train")
parser.add_argument("--max-sequence-length", type=int, default=256)
parser.add_argument("--max-answers", type=int, default=10)
parser.add_argument("--batch-size", type=int, default=16)
parser.add_argument("--epochs", type=int, default=100)
parser.add_argument("--learning-rate", type=float, default=2e-5)
parser.add_argument("--max-grad-norm", type=float, default=2.0)
parser.add_argument("--warmup-steps", type=int, default=0)
parser.add_argument("--weight-decay", type=float, default=0.0)
parser.add_argument("--adam-eps", type=float, default=1e-8)
parser.add_argument("--adam-betas", type=eval, default=(0.9, 0.999))
parser.add_argument("--shuffle", type=eval, default=True)
parser.add_argument("--seed", type=int, default=123)
parser.add_argument("--checkpoint-path",
type=str,
default="gs://openqa-dpr/checkpoints/reader/baseline")
parser.add_argument("--tpu", type=str, default="tpu-v3")
parser.add_argument("--pretrained-model",
type=str,
default="bert-base-uncased")
parser.add_argument("--load-optimizer", type=eval, default=True)
parser.add_argument("--max-to-keep", type=int, default=50)
parser.add_argument("--prefix", type=str, default='pretrained')
args = parser.parse_args()
args_dict = args.__dict__
configs = ["{}: {}".format(k, v) for k, v in args_dict.items()]
configs_string = "\t" + "\n\t".join(configs) + "\n"
print("************************* Configurations *************************")
print(configs_string)
print(
"----------------------------------------------------------------------------------------------------------------------"
)
config_path = "configs/{}/{}/config.yml".format(
os.path.basename(__file__).rstrip(".py"),
datetime.now().strftime("%Y-%m-%d %H-%M-%S"))
write_config(config_path, args_dict)
"""
Set up devices
"""
try: # detect TPUs
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=args.tpu) # TPU detection
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
except Exception: # detect GPUs
devices = tf.config.list_physical_devices("GPU")
# [tf.config.experimental.set_memory_growth(device, True) for device in devices]
if devices:
strategy = tf.distribute.MirroredStrategy()
else:
strategy = tf.distribute.get_strategy()
tf.random.set_seed(args.seed)
"""
Data pipeline
"""
dataset = reader_manipulator.load_tfrecord_reader_train_data(
input_path=args.data_path)
dataset = reader_manipulator.transform_to_reader_train_dataset(
dataset=dataset, max_sequence_length=256, max_answers=10)
dataset = dataset.cache()
dataset = dataset.shuffle(buffer_size=70000)
dataset = dataset.repeat()
dataset = dataset.batch(args.batch_size)
dataset = dataset.prefetch(tf.data.AUTOTUNE)
"""
Distribute the dataset
"""
dist_dataset = strategy.distribute_datasets_from_function(
lambda _: dataset)
iterator = iter(dataset)
"""
Set up for distributed training
"""
steps_per_epoch = args.train_data_size // (args.batch_size *
strategy.num_replicas_in_sync)
config = get_config(model_name=args.pretrained_model, prefix=args.prefix)
with strategy.scope():
encoder = get_encoder(model_name=args.pretrained_model,
args=args,
trainable=True,
prefix=args.prefix)
encoder.bert.pooler.trainable = False
reader = models.Reader(
encoder=encoder,
initializer_range=config.initializer_range,
)
optimizer = optimizers.get_adamw(
epochs=args.epochs,
steps_per_epoch=steps_per_epoch,
warmup_steps=args.warmup_steps,
learning_rate=args.learning_rate,
weight_decay=args.weight_decay,
eps=args.adam_eps,
beta_1=args.adam_betas[0],
beta_2=args.adam_betas[1],
)
loss_calculator = ReaderLossCalculator()
"""
Distributed train step
"""
@tf.function
def dist_train_step(element):
"""The step function for one training step"""
print("This function is tracing !")
def step_fn(element):
"""The computation to be run on each compute device"""
input_ids = element['input_ids']
attention_mask = tf.cast(input_ids > 0, dtype=tf.int32)
start_positions = element['start_positions']
end_positions = element['end_positions']
answer_mask = tf.cast(start_positions > 0, dtype=tf.float32)
with tf.GradientTape() as tape:
start_logits, end_logits = reader(
input_ids=input_ids,
attention_mask=attention_mask,
training=True)
loss = loss_calculator.compute_token_loss(
start_logits=start_logits,
end_logits=end_logits,
start_positions=start_positions,
end_positions=end_positions,
answer_mask=answer_mask)
loss = tf.nn.compute_average_loss(
loss,
global_batch_size=args.batch_size *
strategy.num_replicas_in_sync)
grads = tape.gradient(loss, reader.trainable_weights)
grads = [tf.clip_by_norm(g, args.max_grad_norm) for g in grads]
optimizer.apply_gradients(zip(grads, reader.trainable_weights))
return loss
per_replica_losses = strategy.run(step_fn, args=(element, ))
return strategy.reduce(tf.distribute.ReduceOp.SUM,
per_replica_losses,
axis=None)
"""
Configure checkpoint
"""
with strategy.scope():
checkpoint_path = args.checkpoint_path
ckpt = tf.train.Checkpoint(model=reader, current_epoch=tf.Variable(0))
if not args.load_optimizer:
tmp_optimizer = copy.deepcopy(optimizer)
ckpt.optimizer = tmp_optimizer
else:
ckpt.optimizer = optimizer
ckpt_manager = tf.train.CheckpointManager(ckpt,
checkpoint_path,
max_to_keep=args.max_to_keep)
# if a checkpoint exists, restore the latest checkpoint
if ckpt_manager.latest_checkpoint:
ckpt.restore(ckpt_manager.latest_checkpoint).expect_partial()
current_epoch = ckpt.current_epoch.numpy()
print("Latest checkpoint restored -- Model trained for {} epochs".
format(current_epoch))
else:
print("Checkpoint not found. Train from scratch")
current_epoch = 0
if not args.load_optimizer:
ckpt.optimizer = optimizer
"""
Bootstrap
"""
sample = next(iter(dist_dataset))
dist_train_step(sample)
"""
Training loop
"""
for epoch in range(current_epoch, args.epochs):
print("*************** Epoch {:02d}/{:02d} ***************".format(
epoch + 1, args.epochs))
begin_epoch_time = time.perf_counter()
for step in range(steps_per_epoch):
begin_step_time = time.perf_counter()
loss = dist_train_step(next(iterator))
print("Step {: <6d}Loss: {: <20f}Elapsed: {}".format(
step + 1,
loss.numpy(),
time.perf_counter() - begin_step_time,
))
print("\nEpoch's elapsed time: {}\n".format(time.perf_counter() -
begin_epoch_time))
ckpt.current_epoch.assign_add(1)
# Checkpoint the model
ckpt_save_path = ckpt_manager.save()
print('\nSaving checkpoint for epoch {} at {}'.format(
epoch + 1, ckpt_save_path))
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--query-path",
type=str,
default=const.QUERY_PATH,
help="Path to the queries used to test retriever")
parser.add_argument("--ctx-source-path",
type=str,
default=const.CTX_SOURCE_PATH,
help="Path to the file containg all passages")
parser.add_argument("--checkpoint-path",
type=str,
default=const.CHECKPOINT_PATH,
help="Path to the checkpointed model")
parser.add_argument(
"--top-k",
type=int,
default=const.TOP_K,
help="Number of documents that expects to be returned by retriever")
parser.add_argument("--batch-size",
type=int,
default=16,
help="Batch size when embedding questions")
parser.add_argument("--index-path",
type=str,
default=const.INDEX_PATH,
help="Path to indexed database")
parser.add_argument("--pretrained-model",
type=str,
default=const.PRETRAINED_MODEL)
parser.add_argument("--reader-data-path",
type=str,
default=const.READER_DATA_PATH)
parser.add_argument("--result-path", type=str, default=const.RESULT_PATH)
parser.add_argument("--embeddings-path",
type=str,
default=const.EMBEDDINGS_DIR)
parser.add_argument("--force-create-index", type=eval, default=False)
parser.add_argument("--qas-tfrecord-path",
type=str,
default=const.QAS_TFRECORD_PATH)
parser.add_argument("--max-query-length",
type=int,
default=const.MAX_QUERY_LENGTH)
parser.add_argument("--disable-tf-function", type=eval, default=False)
parser.add_argument("--tpu", type=str, default=const.TPU_NAME)
parser.add_argument("--use-pooler", type=eval, default=True)
parser.add_argument("--prefix", type=str, default='pretrained')
global args
args = parser.parse_args()
model_type = os.path.basename(args.checkpoint_path)
embeddings_path = os.path.join(args.embeddings_path, "shards-42031",
model_type)
args_dict = {**args.__dict__, "embeddings_path": embeddings_path}
configs = ["{}: {}".format(k, v) for k, v in args_dict.items()]
configs_string = "\t" + "\n\t".join(configs) + "\n"
print("************************* Configurations *************************")
print(configs_string)
print(
"----------------------------------------------------------------------------------------------------------------------"
)
config_path = "configs/{}/{}/config.yml".format(
__file__.rstrip(".py"),
datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
write_config(config_path, args_dict)
try: # detect TPUs
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(
tpu=args.tpu) # TPU detection
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
except Exception: # detect GPUs
devices = tf.config.list_physical_devices("GPU")
# [tf.config.experimental.set_memory_growth(device, True) for device in devices]
if devices:
strategy = tf.distribute.MirroredStrategy(["GPU:0", "GPU:1"])
else:
strategy = tf.distribute.get_strategy()
index_path = os.path.join(args.index_path, model_type)
if not os.path.exists(index_path):
os.makedirs(index_path)
indexer = create_or_retrieve_indexer(index_path=index_path,
embeddings_path=embeddings_path)
# exit(0) # only create index
question_encoder = load_checkpoint(checkpoint_path=args.checkpoint_path,
strategy=strategy)
questions, answers = load_qas_test_data()
tokenizer = get_tokenizer(model_name=args.pretrained_model,
prefix=args.prefix)
dataset = prepare_dataset(args.qas_tfrecord_path,
strategy=strategy,
tokenizer=tokenizer,
max_query_length=args.max_query_length)
question_embeddings = generate_embeddings(
question_encoder=question_encoder, dataset=dataset, strategy=strategy)
top_ids_and_scores = search_knn(indexer=indexer,
question_embeddings=question_embeddings)
all_docs = load_ctx_sources()
print("Validating... ")
top_k_hits_path = os.path.join(args.result_path, model_type,
"top_k_hits.txt")
if not os.path.exists(os.path.dirname(top_k_hits_path)):
os.makedirs(os.path.dirname(top_k_hits_path))
start_time = time.perf_counter()
questions_doc_hits = validate(top_ids_and_scores=top_ids_and_scores,
answers=answers,
ctx_sources=all_docs,
top_k_hits_path=top_k_hits_path)
print("done in {}s !".format(time.perf_counter() - start_time))
print(
"----------------------------------------------------------------------------------------------------------------------"
)
print("Generating reader data... ")
reader_data_path = os.path.join(args.reader_data_path, model_type,
"reader_data.json")
if not os.path.exists(os.path.dirname(reader_data_path)):
os.makedirs(os.path.dirname(reader_data_path))
start_time = time.perf_counter()
save_results(questions=questions,
answers=answers,
all_docs=all_docs,
top_passages_and_scores=top_ids_and_scores,
per_question_hits=questions_doc_hits,
out_file=reader_data_path)
print("done in {}s !".format(time.perf_counter() - start_time))
print(
"----------------------------------------------------------------------------------------------------------------------"
)
def main():
parser = argparse.ArgumentParser()
parser.add_argument("--train-data-size", type=int, default=const.TRAIN_DATA_SIZE)
parser.add_argument("--data-path", type=str, default=const.DATA_PATH, help="Path to the `.tfrecord` data. Data in this file is already preprocessed into tensor format")
parser.add_argument("--max-context-length", type=int, default=const.MAX_CONTEXT_LENGTH, help="Maximum length of a document")
parser.add_argument("--max-query-length", type=int, default=const.MAX_QUERY_LENGTH, help="Maximum length of a question")
parser.add_argument("--batch-size", type=int, default=const.BATCH_SIZE, help="Batch size on each compute device")
parser.add_argument("--epochs", type=int, default=const.EPOCHS)
parser.add_argument("--learning-rate", type=float, default=const.LEARNING_RATE)
parser.add_argument("--warmup-steps", type=int, default=const.WARMUP_STEPS)
parser.add_argument("--adam-eps", type=float, default=const.ADAM_EPS)
parser.add_argument("--adam-betas", type=eval, default=const.ADAM_BETAS)
parser.add_argument("--weight-decay", type=float, default=const.WEIGHT_DECAY)
parser.add_argument("--max-grad-norm", type=float, default=const.MAX_GRAD_NORM)
parser.add_argument("--shuffle", type=eval, default=const.SHUFFLE)
parser.add_argument("--seed", type=int, default=const.SHUFFLE_SEED)
parser.add_argument("--checkpoint-path", type=str, default=const.CHECKPOINT_PATH)
parser.add_argument("--ctx-encoder-trainable", type=eval, default=const.CTX_ENCODER_TRAINABLE, help="Whether the context encoder's weights are trainable")
parser.add_argument("--question-encoder-trainable", type=eval, default=const.QUESTION_ENCODER_TRAINABLE, help="Whether the question encoder's weights are trainable")
parser.add_argument("--tpu", type=str, default=const.TPU_NAME)
parser.add_argument("--loss-fn", type=str, choices=['inbatch', 'threelevel', 'twolevel', 'hardnegvsneg', 'hardnegvsnegsoftmax', 'threelevelsoftmax'], default='threelevel')
parser.add_argument("--use-pooler", type=eval, default=True)
parser.add_argument("--load-optimizer", type=eval, default=True)
parser.add_argument("--tokenizer", type=str, default="bert-base-uncased")
parser.add_argument("--question-pretrained-model", type=str, default='bert-base-uncased')
parser.add_argument("--context-pretrained-model", type=str, default='bigbird')
parser.add_argument("--within-size", type=int, default=8)
parser.add_argument("--prefix", type=str, default=None)
global args
args = parser.parse_args()
args_dict = args.__dict__
configs = ["{}: {}".format(k, v) for k, v in args_dict.items()]
configs_string = "\t" + "\n\t".join(configs) + "\n"
print("************************* Configurations *************************")
print(configs_string)
print("----------------------------------------------------------------------------------------------------------------------")
file_name = os.path.basename(__file__)
config_path = "configs/{}/{}/config.yml".format(file_name.rstrip(".py"), datetime.now().strftime("%Y-%m-%d %H-%M-%S"))
write_config(config_path, args_dict)
epochs = args.epochs
global strategy
try: # detect TPUs
resolver = tf.distribute.cluster_resolver.TPUClusterResolver(tpu=args.tpu) # TPU detection
tf.config.experimental_connect_to_cluster(resolver)
tf.tpu.experimental.initialize_tpu_system(resolver)
strategy = tf.distribute.TPUStrategy(resolver)
except Exception: # detect GPUs
devices = tf.config.list_physical_devices("GPU")
# [tf.config.experimental.set_memory_growth(device, True) for device in devices]
if devices:
strategy = tf.distribute.MirroredStrategy()
else:
strategy = tf.distribute.get_strategy()
tf.random.set_seed(args.seed)
tokenizer = get_tokenizer(model_name=args.tokenizer, prefix=args.prefix)
"""Data pipeline
1. Load retriever data (in `.tfrecord` format, stored serialized `tf.int32` tensor)
2. Padding sequence to the same length
3. Shuffle: You should shuffle before batch to guarantee that each data sample can be batched with different data samples in different epochs
4. Repeating data: repeat to produce indefininte data stream
5. Batching dataset
6. Prefetching dataset (to speed up training)
"""
dataset = biencoder_manipulator.load_retriever_tfrecord_int_data(
input_path=args.data_path,
shuffle=args.shuffle,
shuffle_seed=args.seed
)
dataset = biencoder_manipulator.pad(
dataset,
sep_token_id=tokenizer.sep_token_id,
max_context_length=args.max_context_length,
max_query_length=args.max_query_length
)
if args.loss_fn == 'inbatch':
dataset = dataset.map(
lambda x: {
'question': x['question'],
'contexts': x['contexts'][:2]
},
num_parallel_calls=tf.data.AUTOTUNE,
)
else:
dataset = dataset.map(
lambda x: {
'question': x['question'],
'contexts': x['contexts'][:args.within_size]
}
)
dataset = dataset.shuffle(buffer_size=60000)
dataset = dataset.repeat()
dataset = dataset.batch(args.batch_size)
dataset = dataset.prefetch(tf.data.AUTOTUNE)
"""
Distribute the dataset
"""
dist_dataset = strategy.distribute_datasets_from_function(
lambda _: dataset
)
iterator = iter(dist_dataset)
"""
Set up for distributed training
"""
steps_per_epoch = args.train_data_size // (args.batch_size * strategy.num_replicas_in_sync)
global optimizer
global loss_fn
global retriever
with strategy.scope():
# Instantiate question encoder
question_encoder = get_encoder(
model_name=args.question_pretrained_model,
args=args,
trainable=args.question_encoder_trainable,
prefix=args.prefix
)
# Instantiate context encoder
context_encoder = get_encoder(
model_name=args.context_pretrained_model,
args=args,
trainable=args.ctx_encoder_trainable,
prefix=args.prefix
)
retriever = models.BiEncoder(
question_model=question_encoder,
ctx_model=context_encoder,
use_pooler=args.use_pooler
)
# Instantiate the optimizer
optimizer = optimizers.get_adamw(
steps_per_epoch=steps_per_epoch,
warmup_steps=args.warmup_steps,
epochs=args.epochs,
learning_rate=args.learning_rate,
eps=args.adam_eps,
beta_1=args.adam_betas[0],
beta_2=args.adam_betas[1],
weight_decay=args.weight_decay,
)
# Define loss function
if args.loss_fn == 'threelevel':
loss_fn = biencoder.ThreeLevelDPRLoss(batch_size=args.batch_size, within_size=args.within_size)
elif args.loss_fn == 'twolevel':
loss_fn = biencoder.TwoLevelDPRLoss(batch_size=args.batch_size, within_size=args.within_size)
elif args.loss_fn == "hardnegvsneg":
loss_fn = biencoder.HardNegVsNegDPRLoss(batch_size=args.batch_size, within_size=args.within_size)
elif args.loss_fn == 'hardnegvsnegsoftmax':
loss_fn = biencoder.HardNegVsNegSoftMaxDPRLoss(batch_size=args.batch_size, within_size=args.within_size)
elif args.loss_fn == 'threelevelsoftmax':
loss_fn = biencoder.ThreeLevelSoftMaxDPRLoss(batch_size=args.batch_size, within_size=args.within_size)
else:
loss_fn = biencoder.InBatchDPRLoss(batch_size=args.batch_size)
"""
Distributed train step
"""
dist_train_step = get_dist_train_step(
model_name=args.context_pretrained_model
)
"""
Configure checkpoint
"""
with strategy.scope():
checkpoint_path = args.checkpoint_path
ckpt = tf.train.Checkpoint(
model=retriever,
current_epoch=tf.Variable(0)
)
if not args.load_optimizer:
tmp_optimizer = copy.deepcopy(optimizer)
ckpt.optimizer = tmp_optimizer
else:
ckpt.optimizer = optimizer
ckpt_manager = tf.train.CheckpointManager(ckpt, checkpoint_path, max_to_keep=3)
# if a checkpoint exists, restore the latest checkpoint
if ckpt_manager.latest_checkpoint:
ckpt.restore(ckpt_manager.latest_checkpoint).expect_partial()
current_epoch = ckpt.current_epoch.numpy()
print("Latest checkpoint restored -- Model trained for {} epochs".format(current_epoch))
else:
print("Checkpoint not found. Train from scratch")
current_epoch = 0
if not args.load_optimizer:
ckpt.optimizer = optimizer
"""
Bootstrap
"""
sample = next(iter(dist_dataset))
dist_train_step(sample)
"""
Training loop
"""
for epoch in range(current_epoch, epochs):
print("*************** Epoch {:02d}/{:02d} ***************".format(epoch + 1, epochs))
begin_epoch_time = time.perf_counter()
for step in range(steps_per_epoch):
begin_step_time = time.perf_counter()
loss = dist_train_step(next(iterator))
print("Step {: <6d}Loss: {: <20f}Elapsed: {}".format(
step + 1,
loss.numpy(),
time.perf_counter() - begin_step_time,
))
print("\nEpoch's elapsed time: {}\n".format(time.perf_counter() - begin_epoch_time))
ckpt.current_epoch.assign_add(1)
# Checkpoint the model
ckpt_save_path = ckpt_manager.save()
print ('\nSaving checkpoint for epoch {} at {}'.format(epoch + 1, ckpt_save_path))
