def _internal_eval(model, global_step, sess, iterator, iterator_feed_dict,
summary_writer, label):
"""Computing perplexity."""
sess.run(iterator.initializer, feed_dict=iterator_feed_dict)
ppl = model_helper.compute_perplexity(model, sess, label)
utils.add_summary(summary_writer, global_step, "%s_ppl" % label, ppl)
return ppl
def _internal_eval(model, global_step, sess, iterator, iterator_feed_dict, summary_writer, label):
"""Used to compute perplexity on the dataset provided through the iterator"""
# Initialize the iterator using the feed dict
sess.run(iterator.initializer, feed_dict=iterator_feed_dict)
# Compute the perplexity
ppl = model_helper.compute_perplexity(model, sess, name=label)
# Add summary for the ppl to the summary writer
utils.add_summary(summary_writer, global_step, tag="%s_ppl" % label, value=ppl)
return ppl
def _external_eval(model, global_step, sess, hparams, iterator,
iterator_feed_dict, tgt_file, label, summary_writer,
save_on_best_dev):
"""External evaluation such as BLEU and ROUGE scores. If save on best then keep the best scores in the hparams"""
out_dir = hparams.out_dir
# Avoids running eval when global step is 0
decode = global_step > 0
if decode:
utils.print_out("# External evaluation, global step %d" % global_step)
# Initialize the iterator
sess.run(iterator.initializer, feed_dict=iterator_feed_dict)
# Create the output file for the logs
output_file = os.path.join(out_dir, "output_%s" % label)
# Get the scores for the metrics
scores = chatbot_utils.decode_and_evaluate(
name=label,
model=model,
sess=sess,
output_file=output_file,
reference_file=tgt_file,
metrics=hparams.metrics,
bpe_delimiter=hparams.bpe_delimiter,
beam_width=hparams.beam_width,
eos=hparams.eos,
number_token=hparams.number_token,
name_token=hparams.name_token,
decode=decode
)
# Create the summaries and also save the best
if decode:
for metric in hparams.metrics:
# Create the summary
utils.add_summary(summary_writer, global_step, "%s_%s" % (label, metric),
scores[metric])
# Is the current metric score better than the last
if save_on_best_dev and scores[metric] > getattr(hparams, "best_" + metric):
# Update the hparams score
setattr(hparams, "best_" + metric, scores[metric])
# Save the model which got the best for this metric to file
model.saver.save(sess,
os.path.join(getattr(hparams, "best_" + metric + "_dir"), "dialogue.ckpt"),
global_step=model.global_step) # For safety
# Save the hparams to file
utils.save_hparams(out_dir, hparams, verbose=True)
return scores
def _external_eval(model, global_step, sess, hparams, iterator,
iterator_feed_dict, tgt_file, label, summary_writer,
save_on_best):
"""External evaluation such as BLEU and ROUGE scores."""
out_dir = hparams.out_dir
decode = global_step > 0
if decode:
utils.print_out("# External evaluation, global step %d" % global_step)
sess.run(iterator.initializer, feed_dict=iterator_feed_dict)
output = os.path.join(out_dir, "output_%s" % label)
scores = nmt_utils.decode_and_evaluate(label,
model,
sess,
output,
ref_file=tgt_file,
metrics=hparams.metrics,
bpe_delimiter=hparams.bpe_delimiter,
beam_width=hparams.beam_width,
tgt_sos=hparams.sos,
tgt_eos=hparams.eos,
decode=decode)
# Save on best metrics
if decode:
for metric in hparams.metrics:
utils.add_summary(summary_writer, global_step,
"%s_%s" % (label, metric), scores[metric])
# metric: larger is better
if save_on_best and scores[metric] > getattr(
hparams, "best_" + metric):
setattr(hparams, "best_" + metric, scores[metric])
model.saver.save(sess,
os.path.join(
getattr(hparams,
"best_" + metric + "_dir"),
"translate.ckpt"),
global_step=model.global_step)
utils.save_hparams(out_dir, hparams)
return scores
def train(hparams, scope=None, target_session=''):
"""Train the chatbot"""
# Initialize some local hyperparameters
log_device_placement = hparams.log_device_placement
out_dir = hparams.out_dir
num_train_steps = hparams.num_train_steps
steps_per_stats = hparams.steps_per_stats
steps_per_external_eval = hparams.steps_per_external_eval
steps_per_eval = 10 * steps_per_stats
if not steps_per_external_eval:
steps_per_external_eval = 5 * steps_per_eval
if hparams.architecture == "simple":
model_creator = SimpleModel
get_infer_iterator = iterator_utils.get_infer_iterator
get_iterator = iterator_utils.get_iterator
elif hparams.architecture == "hier":
model_creator = HierarchicalModel
# Parse some of the arguments now
def curry_get_infer_iterator(dataset, vocab_table, batch_size, src_reverse,
eos, src_max_len):
return end2end_iterator_utils.get_infer_iterator(dataset, vocab_table, batch_size, src_reverse, eos,
src_max_len=src_max_len, eou=hparams.eou,
dialogue_max_len=hparams.dialogue_max_len)
get_infer_iterator = curry_get_infer_iterator
def curry_get_iterator(src_dataset,
tgt_dataset,
vocab_table,
batch_size,
sos,
eos,
src_reverse,
random_seed,
num_buckets,
src_max_len=None,
tgt_max_len=None,
num_threads=4,
output_buffer_size=None,
skip_count=None):
return end2end_iterator_utils.get_iterator(src_dataset, tgt_dataset, vocab_table, batch_size, sos, eos,
eou=hparams.eou, src_reverse=src_reverse, random_seed=random_seed,
num_dialogue_buckets=num_buckets, src_max_len=src_max_len,
tgt_max_len=tgt_max_len, num_threads=num_threads,
output_buffer_size=output_buffer_size, skip_count=skip_count)
get_iterator = curry_get_iterator
else:
raise ValueError("Unkown architecture", hparams.architecture)
# Create three models which share parameters through the use of checkpoints
train_model = create_train_model(model_creator, get_iterator, hparams, scope)
eval_model = create_eval_model(model_creator, get_iterator, hparams, scope)
infer_model = inference.create_infer_model(model_creator, get_infer_iterator, hparams, scope)
# ToDo: adapt for architectures
# Preload the data to use for sample decoding
dev_src_file = "%s.%s" % (hparams.dev_prefix, hparams.src)
dev_tgt_file = "%s.%s" % (hparams.dev_prefix, hparams.tgt)
sample_src_data = inference.load_data(dev_src_file)
sample_tgt_data = inference.load_data(dev_tgt_file)
summary_name = "train_log"
model_dir = hparams.out_dir
# Log and output files
log_file = os.path.join(out_dir, "log_%d" % time.time())
log_f = tf.gfile.GFile(log_file, mode="a")
utils.print_out("# log_file=%s" % log_file, log_f)
avg_step_time = 0.0
# Create the configurations for the sessions
config_proto = utils.get_config_proto(log_device_placement=log_device_placement)
# Create three sessions, one for each model
train_sess = tf.Session(target=target_session, config=config_proto, graph=train_model.graph)
eval_sess = tf.Session(target=target_session, config=config_proto, graph=eval_model.graph)
infer_sess = tf.Session(target=target_session, config=config_proto, graph=infer_model.graph)
# Load the train model from checkpoint or create a new one
with train_model.graph.as_default():
loaded_train_model, global_step = model_helper.create_or_load_model(train_model.model, model_dir,
train_sess, name="train")
# Summary writer
summary_writer = tf.summary.FileWriter(
os.path.join(out_dir, summary_name), train_model.graph)
# First evaluation
run_full_eval(
model_dir, infer_model, infer_sess,
eval_model, eval_sess, hparams,
summary_writer, sample_src_data,
sample_tgt_data)
last_stats_step = global_step
last_eval_step = global_step
last_external_eval_step = global_step
# This is the training loop.
# Initialize the hyperparameters for the loop.
step_time, checkpoint_loss, checkpoint_predict_count = 0.0, 0.0, 0.0
checkpoint_total_count = 0.0
speed, train_ppl = 0.0, 0.0
start_train_time = time.time()
utils.print_out(
"# Start step %d, lr %g, %s" %
(global_step, loaded_train_model.learning_rate.eval(session=train_sess),
time.ctime()),
log_f)
# epoch_step records where we were within an epoch. Used to skip trained on examples
skip_count = hparams.batch_size * hparams.epoch_step
utils.print_out("# Init train iterator, skipping %d elements" % skip_count)
# Initialize the training iterator
train_sess.run(
train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: skip_count})
# Train until we reach num_steps.
while global_step < num_train_steps:
# Run a step
start_step_time = time.time()
try:
step_result = loaded_train_model.train(train_sess)
(_, step_loss, step_predict_count, step_summary, global_step, # The _ is the output of the update op
step_word_count, batch_size) = step_result
hparams.epoch_step += 1
except tf.errors.OutOfRangeError:
# Finished going through the training dataset. Go to next epoch.
hparams.epoch_step = 0
utils.print_out(
"# Finished an epoch, step %d. Perform external evaluation" %
global_step)
# Decode and print a random sentence
run_sample_decode(infer_model, infer_sess, model_dir, hparams, summary_writer,
sample_src_data, sample_tgt_data)
# Perform external evaluation to save checkpoints if this is the best for some metric
dev_scores, test_scores, _ = run_external_evaluation(infer_model, infer_sess, model_dir, hparams,
summary_writer, save_on_best_dev=True)
# Reinitialize the iterator from the beginning
train_sess.run(train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: 0})
continue
# Write step summary.
summary_writer.add_summary(step_summary, global_step)
# update statistics
step_time += (time.time() - start_step_time)
checkpoint_loss += (step_loss * batch_size)
checkpoint_predict_count += step_predict_count
checkpoint_total_count += float(step_word_count)
# Once in a while, we print statistics.
if global_step - last_stats_step >= steps_per_stats:
last_stats_step = global_step
# Print statistics for the previous epoch.
avg_step_time = step_time / steps_per_stats
train_ppl = utils.safe_exp(checkpoint_loss / checkpoint_predict_count)
speed = checkpoint_total_count / (1000 * step_time)
utils.print_out(
" global step %d lr %g "
"step-time %.2fs wps %.2fK ppl %.2f %s" %
(global_step,
loaded_train_model.learning_rate.eval(session=train_sess),
avg_step_time, speed, train_ppl, _get_best_results(hparams)),
log_f)
if math.isnan(train_ppl):
# The model has screwed up
break
# Reset timer and loss.
step_time, checkpoint_loss, checkpoint_predict_count = 0.0, 0.0, 0.0
checkpoint_total_count = 0.0
if global_step - last_eval_step >= steps_per_eval:
# Perform evaluation. Start by reassigning the last_eval_step variable to the current step
last_eval_step = global_step
# Print the progress and add summary
utils.print_out("# Save eval, global step %d" % global_step)
utils.add_summary(summary_writer, global_step, "train_ppl", train_ppl)
# Save checkpoint
loaded_train_model.saver.save(train_sess, os.path.join(out_dir, "chatbot.ckpt"), global_step=global_step)
# Decode and print a random sample
run_sample_decode(infer_model, infer_sess, model_dir, hparams, summary_writer,
sample_src_data, sample_tgt_data)
# Run internal evaluation, and update the ppl variables. The data iterator is instantieted in the method.
dev_ppl, test_ppl = run_internal_eval(eval_model, eval_sess, model_dir, hparams, summary_writer)
if global_step - last_external_eval_step >= steps_per_external_eval:
# Run the external evaluation
last_external_eval_step = global_step
# Save checkpoint
loaded_train_model.saver.save(train_sess, os.path.join(out_dir, "chatbot.ckpt"), global_step=global_step)
# Decode and print a random sample
run_sample_decode(infer_model, infer_sess, model_dir, hparams, summary_writer,
sample_src_data, sample_tgt_data)
# Run external evaluation, updating metric scores in the meanwhile. The unneeded output is the global step.
dev_scores, test_scores, _ = run_external_evaluation(infer_model, infer_sess, model_dir, hparams,
summary_writer, save_on_best_dev=True)
# Done training. Save the model
loaded_train_model.saver.save(
train_sess,
os.path.join(out_dir, "chatbot.ckpt"),
global_step=global_step)
result_summary, _, dev_scores, test_scores, dev_ppl, test_ppl = run_full_eval(
model_dir, infer_model, infer_sess,
eval_model, eval_sess, hparams,
summary_writer, sample_src_data,
sample_tgt_data)
utils.print_out(
"# Final, step %d lr %g "
"step-time %.2f wps %.2fK ppl %.2f, %s, %s" %
(global_step, loaded_train_model.learning_rate.eval(session=train_sess),
avg_step_time, speed, train_ppl, result_summary, time.ctime()),
log_f)
utils.print_time("# Done training!", start_train_time)
utils.print_out("# Start evaluating saved best models.")
for metric in hparams.metrics:
best_model_dir = getattr(hparams, "best_" + metric + "_dir")
result_summary, best_global_step, _, _, _, _ = run_full_eval(
best_model_dir, infer_model, infer_sess, eval_model, eval_sess, hparams,
summary_writer, sample_src_data, sample_tgt_data)
utils.print_out("# Best %s, step %d "
"step-time %.2f wps %.2fK, %s, %s" %
(metric, best_global_step, avg_step_time, speed,
result_summary, time.ctime()), log_f)
summary_writer.close()
return (dev_scores, test_scores, dev_ppl, test_ppl, global_step)
def train(hparams, scope=None, target_session=""):
"""Train a translation model."""
log_device_placement = hparams.log_device_placement
out_dir = hparams.out_dir
num_train_steps = hparams.num_train_steps
steps_per_stats = hparams.steps_per_stats
steps_per_external_eval = hparams.steps_per_external_eval
steps_per_eval = 10 * steps_per_stats
if not steps_per_external_eval:
steps_per_external_eval = 5 * steps_per_eval
if not hparams.attention:
model_creator = nmt_model.Model
elif hparams.attention_architecture == "standard":
model_creator = attention_model.AttentionModel
elif hparams.attention_architecture in ["gnmt", "gnmt_v2"]:
model_creator = gnmt_model.GNMTModel
else:
raise ValueError("Unknown model architecture")
train_model = model_helper.create_train_model(model_creator, hparams,
scope)
eval_model = model_helper.create_eval_model(model_creator, hparams, scope)
infer_model = model_helper.create_infer_model(model_creator, hparams,
scope)
# Preload data for sample decoding.
dev_src_file = "%s.%s" % (hparams.dev_prefix, hparams.src)
dev_tgt_file = "%s.%s" % (hparams.dev_prefix, hparams.tgt)
sample_src_data = inference.load_data(dev_src_file)
sample_tgt_data = inference.load_data(dev_tgt_file)
summary_name = "train_log"
model_dir = hparams.out_dir
# Log and output files
log_file = os.path.join(out_dir, "log_%d" % time.time())
log_f = tf.gfile.GFile(log_file, mode="w")
utils.print_out("# log_file=%s" % log_file, log_f)
avg_step_time = 0.0
# TensorFlow model
config_proto = utils.get_config_proto(
log_device_placement=log_device_placement)
train_sess = tf.Session(target=target_session,
config=config_proto,
graph=train_model.graph)
eval_sess = tf.Session(target=target_session,
config=config_proto,
graph=eval_model.graph)
infer_sess = tf.Session(target=target_session,
config=config_proto,
graph=infer_model.graph)
with train_model.graph.as_default():
loaded_train_model, global_step = model_helper.create_or_load_model(
train_model.model, model_dir, train_sess, "train")
# Summary writer
summary_writer = tf.summary.FileWriter(os.path.join(out_dir, summary_name),
train_model.graph)
# First evaluation
run_full_eval(model_dir, infer_model, infer_sess, eval_model, eval_sess,
hparams, summary_writer, sample_src_data, sample_tgt_data)
last_stats_step = global_step
last_eval_step = global_step
last_external_eval_step = global_step
# This is the training loop.
step_time, checkpoint_loss, checkpoint_predict_count = 0.0, 0.0, 0.0
checkpoint_total_count = 0.0
speed, train_ppl = 0.0, 0.0
start_train_time = time.time()
utils.print_out(
"# Start step %d, lr %g, %s" %
(global_step, loaded_train_model.learning_rate.eval(
session=train_sess), time.ctime()), log_f)
# Initialize all of the iterators
skip_count = hparams.batch_size * hparams.epoch_step
utils.print_out("# Init train iterator, skipping %d elements" % skip_count)
if hparams.curriculum == 'none':
train_sess.run(
train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: skip_count})
else:
if hparams.curriculum == 'predictive_gain':
exp3s = Exp3S(hparams.num_curriculum_buckets, 0.001, 0, 0.05)
elif hparams.curriculum == 'look_back_and_forward':
curriculum_point = 0
handle = train_model.iterator.handle
for i in range(hparams.num_curriculum_buckets):
train_sess.run(
train_model.iterator.initializer[i].initializer,
feed_dict={train_model.skip_count_placeholder: skip_count})
iterator_handles = [
train_sess.run(
train_model.iterator.initializer[i].string_handle(),
feed_dict={train_model.skip_count_placeholder: skip_count})
for i in range(hparams.num_curriculum_buckets)
]
utils.print_out("Starting training")
while global_step < num_train_steps:
### Run a step ###
start_time = time.time()
try:
if hparams.curriculum != 'none':
if hparams.curriculum == 'predictive_gain':
lesson = exp3s.draw_task()
elif hparams.curriculum == 'look_back_and_forward':
if curriculum_point == hparams.num_curriculum_buckets:
lesson = np.random.randint(
low=0, high=hparams.num_curriculum_buckets)
else:
lesson = curriculum_point if np.random.random_sample(
) < 0.8 else np.random.randint(
low=0, high=hparams.num_curriculum_buckets)
step_result = loaded_train_model.train(
hparams,
train_sess,
handle=handle,
iterator_handle=iterator_handles[lesson],
use_fed_source_placeholder=loaded_train_model.
use_fed_source,
fed_source_placeholder=loaded_train_model.fed_source)
(_, step_loss, step_predict_count, step_summary, global_step,
step_word_count, batch_size, source) = step_result
if hparams.curriculum == 'predictive_gain':
new_loss = train_sess.run(
[loaded_train_model.train_loss],
feed_dict={
handle: iterator_handles[lesson],
loaded_train_model.use_fed_source: True,
loaded_train_model.fed_source: source
})
# new_loss = loaded_train_model.train_loss.eval(
# session=train_sess,
# feed_dict={
# handle: iterator_handles[lesson],
# loaded_train_model.use_fed_source: True,
# loaded_train_model.fed_source: source
# })
# utils.print_out("lesson: %s, step loss: %s, new_loss: %s" % (lesson, step_loss, new_loss))
# utils.print_out("exp3s dist: %s" % (exp3s.pi, ))
curriculum_point_a = lesson * (
hparams.src_max_len //
hparams.num_curriculum_buckets) + 1
curriculum_point_b = (
lesson + 1) * (hparams.src_max_len //
hparams.num_curriculum_buckets) + 1
v = step_loss - new_loss
exp3s.update_w(
v,
float(curriculum_point_a + curriculum_point_b) / 2.0)
elif hparams.curriculum == 'look_back_and_forward':
utils.print_out("step loss: %s, lesson: %s" %
(step_loss, lesson))
curriculum_point_a = curriculum_point * (
hparams.src_max_len //
hparams.num_curriculum_buckets) + 1
curriculum_point_b = (curriculum_point + 1) * (
hparams.src_max_len //
hparams.num_curriculum_buckets) + 1
if step_loss < (hparams.curriculum_progress_loss *
(float(curriculum_point_a +
curriculum_point_b) / 2.0)):
curriculum_point += 1
else:
step_result = loaded_train_model.train(hparams, train_sess)
(_, step_loss, step_predict_count, step_summary, global_step,
step_word_count, batch_size) = step_result
hparams.epoch_step += 1
except tf.errors.OutOfRangeError:
# Finished going through the training dataset. Go to next epoch.
hparams.epoch_step = 0
# utils.print_out(
# "# Finished an epoch, step %d. Perform external evaluation" %
# global_step)
# run_sample_decode(infer_model, infer_sess,
# model_dir, hparams, summary_writer, sample_src_data,
# sample_tgt_data)
# dev_scores, test_scores, _ = run_external_eval(
# infer_model, infer_sess, model_dir,
# hparams, summary_writer)
if hparams.curriculum == 'none':
train_sess.run(
train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: 0})
else:
train_sess.run(
train_model.iterator.initializer[lesson].initializer,
feed_dict={train_model.skip_count_placeholder: 0})
continue
# Write step summary.
summary_writer.add_summary(step_summary, global_step)
# update statistics
step_time += (time.time() - start_time)
checkpoint_loss += (step_loss * batch_size)
checkpoint_predict_count += step_predict_count
checkpoint_total_count += float(step_word_count)
# Once in a while, we print statistics.
if global_step - last_stats_step >= steps_per_stats:
if hparams.curriculum == 'predictive_gain':
utils.print_out("lesson: %s, step loss: %s, new_loss: %s" %
(lesson, step_loss, new_loss))
utils.print_out("exp3s dist: %s" % (exp3s.pi, ))
last_stats_step = global_step
# Print statistics for the previous epoch.
avg_step_time = step_time / steps_per_stats
train_ppl = utils.safe_exp(checkpoint_loss /
checkpoint_predict_count)
speed = checkpoint_total_count / (1000 * step_time)
utils.print_out(
" global step %d lr %g "
"step-time %.2fs wps %.2fK ppl %.2f %s" %
(global_step,
loaded_train_model.learning_rate.eval(session=train_sess),
avg_step_time, speed, train_ppl, _get_best_results(hparams)),
log_f)
if math.isnan(train_ppl):
break
# Reset timer and loss.
step_time, checkpoint_loss, checkpoint_predict_count = 0.0, 0.0, 0.0
checkpoint_total_count = 0.0
if global_step - last_eval_step >= steps_per_eval:
last_eval_step = global_step
utils.print_out("# Save eval, global step %d" % global_step)
utils.add_summary(summary_writer, global_step, "train_ppl",
train_ppl)
# Save checkpoint
loaded_train_model.saver.save(train_sess,
os.path.join(out_dir,
"translate.ckpt"),
global_step=global_step)
# Evaluate on dev/test
run_sample_decode(infer_model, infer_sess, model_dir, hparams,
summary_writer, sample_src_data, sample_tgt_data)
dev_ppl, test_ppl = run_internal_eval(eval_model, eval_sess,
model_dir, hparams,
summary_writer)
dev_scores, test_scores, _ = run_external_eval(
infer_model, infer_sess, model_dir, hparams, summary_writer)
# if global_step - last_external_eval_step >= steps_per_external_eval:
# last_external_eval_step = global_step
# # Save checkpoint
# loaded_train_model.saver.save(
# train_sess,
# os.path.join(out_dir, "translate.ckpt"),
# global_step=global_step)
# run_sample_decode(infer_model, infer_sess,
# model_dir, hparams, summary_writer, sample_src_data,
# sample_tgt_data)
# dev_scores, test_scores, _ = run_external_eval(
# infer_model, infer_sess, model_dir,
# hparams, summary_writer)
# Done training
loaded_train_model.saver.save(train_sess,
os.path.join(out_dir, "translate.ckpt"),
global_step=global_step)
result_summary, _, dev_scores, test_scores, dev_ppl, test_ppl = run_full_eval(
model_dir, infer_model, infer_sess, eval_model, eval_sess, hparams,
summary_writer, sample_src_data, sample_tgt_data)
utils.print_out(
"# Final, step %d lr %g "
"step-time %.2f wps %.2fK ppl %.2f, %s, %s" %
(global_step,
loaded_train_model.learning_rate.eval(session=train_sess),
avg_step_time, speed, train_ppl, result_summary, time.ctime()), log_f)
utils.print_time("# Done training!", start_train_time)
utils.print_out("# Start evaluating saved best models.")
for metric in hparams.metrics:
best_model_dir = getattr(hparams, "best_" + metric + "_dir")
result_summary, best_global_step, _, _, _, _ = run_full_eval(
best_model_dir, infer_model, infer_sess, eval_model, eval_sess,
hparams, summary_writer, sample_src_data, sample_tgt_data)
utils.print_out(
"# Best %s, step %d "
"step-time %.2f wps %.2fK, %s, %s" %
(metric, best_global_step, avg_step_time, speed, result_summary,
time.ctime()), log_f)
summary_writer.close()
return (dev_scores, test_scores, dev_ppl, test_ppl, global_step)
def train(hparams, scope=None, target_session=""):
"""Train a translation model."""
log_device_placement = hparams.log_device_placement
out_dir = hparams.out_dir
num_train_steps = hparams.num_train_steps
steps_per_stats = hparams.steps_per_stats
steps_per_external_eval = hparams.steps_per_external_eval
steps_per_eval = 10 * steps_per_stats
if not steps_per_external_eval:
steps_per_external_eval = 5 * steps_per_eval
print(hparams.attention)
if hparams.attention.strip() == "":
model_creator = nmt_model.Model
print("using nmt model " + hparams.attention + "done")
elif hparams.attention_architecture == "standard":
model_creator = attention_model.AttentionModel
print("using attention model " + hparams.attention + "done")
elif hparams.attention_architecture in ["gnmt", "gnmt_v2"]:
model_creator = gnmt_model.GNMTModel
print("using gnmt model")
else:
raise ValueError("Unknown model architecture")
train_model = model_helper.create_train_model(model_creator, hparams,
scope)
eval_model = model_helper.create_eval_model(model_creator, hparams, scope)
infer_model = model_helper.create_infer_model(model_creator, hparams,
scope)
# Preload data for sample decoding.
dev_src_file = hparams.dev_src
dev_tgt_file = hparams.dev_tgt
sample_src_data = inference.load_data(dev_src_file)
sample_tgt_data = inference.load_data(dev_tgt_file)
summary_name = "train_log"
#
# Log and output files
log_file = os.path.join(out_dir, "log_%d" % time.time())
log_f = tf.gfile.GFile(log_file, mode="a")
utils.print_out("# log_file=%s" % log_file, log_f)
avg_step_time = 0.0
model_dir = hparams.out_dir
# TensorFlow model
config_proto = utils.get_config_proto(
log_device_placement=log_device_placement)
train_sess = tf.Session(target=target_session,
config=config_proto,
graph=train_model.graph)
eval_sess = tf.Session(target=target_session,
config=config_proto,
graph=eval_model.graph)
infer_sess = tf.Session(target=target_session,
config=config_proto,
graph=infer_model.graph)
with train_model.graph.as_default():
loaded_train_model, global_step = model_helper.create_model_Alveo(
train_model.model, train_sess, "train")
# Summary writer
summary_writer = tf.summary.FileWriter(os.path.join(out_dir, summary_name),
train_model.graph)
# First evaluation
run_full_eval(model_dir, infer_model, infer_sess, eval_model, eval_sess,
hparams, summary_writer, sample_src_data, sample_tgt_data)
last_stats_step = global_step
last_eval_step = global_step
last_external_eval_step = global_step
# This is the training loop.
stats = init_stats()
speed, train_ppl = 0.0, 0.0
start_train_time = time.time()
utils.print_out(
"# Start step %d, lr %g, %s" %
(global_step, loaded_train_model.learning_rate.eval(
session=train_sess), time.ctime()), log_f)
# Initialize all of the iterators
skip_count = hparams.batch_size * hparams.epoch_step
utils.print_out("# Init train iterator, skipping %d elements" % skip_count)
train_sess.run(train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: skip_count})
while global_step < num_train_steps:
### Run a step ###
start_time = time.time()
try:
step_result = loaded_train_model.train(train_sess)
hparams.epoch_step += 1
except tf.errors.OutOfRangeError:
# Finished going through the training dataset. Go to next epoch.
hparams.epoch_step = 0
utils.print_out(
"# Finished an epoch, step %d. Perform external evaluation" %
global_step)
run_sample_decode(infer_model, infer_sess, model_dir, hparams,
summary_writer, sample_src_data, sample_tgt_data)
dev_scores, test_scores, _ = run_external_eval(
infer_model, infer_sess, model_dir, hparams, summary_writer)
train_sess.run(train_model.iterator.initializer,
feed_dict={train_model.skip_count_placeholder: 0})
continue
# Write step summary and accumulate statistics
global_step = update_stats(stats, summary_writer, start_time,
step_result)
# Once in a while, we print statistics.
if global_step - last_stats_step >= steps_per_stats:
last_stats_step = global_step
is_overflow = check_stats(stats, global_step, steps_per_stats,
hparams, log_f)
if is_overflow:
break
# Reset statistics
stats = init_stats()
if global_step - last_eval_step >= steps_per_eval:
last_eval_step = global_step
utils.print_out("# Save eval, global step %d" % global_step)
utils.add_summary(summary_writer, global_step, "train_ppl",
train_ppl)
# Save checkpoint
loaded_train_model.saver.save(train_sess,
os.path.join(out_dir,
"translate.ckpt"),
global_step=global_step)
# Evaluate on dev/test
run_sample_decode(infer_model, infer_sess, model_dir, hparams,
summary_writer, sample_src_data, sample_tgt_data)
dev_ppl, test_ppl = run_internal_eval(eval_model, eval_sess,
model_dir, hparams,
summary_writer)
if global_step - last_external_eval_step >= steps_per_external_eval:
last_external_eval_step = global_step
# Save checkpoint
loaded_train_model.saver.save(train_sess,
os.path.join(out_dir,
"translate.ckpt"),
global_step=global_step)
run_sample_decode(infer_model, infer_sess, model_dir, hparams,
summary_writer, sample_src_data, sample_tgt_data)
dev_scores, test_scores, _ = run_external_eval(
infer_model, infer_sess, model_dir, hparams, summary_writer)
# Done training
loaded_train_model.saver.save(train_sess,
os.path.join(out_dir, "translate.ckpt"),
global_step=global_step)
result_summary, _, dev_scores, test_scores, dev_ppl, test_ppl = run_full_eval(
model_dir, infer_model, infer_sess, eval_model, eval_sess, hparams,
summary_writer, sample_src_data, sample_tgt_data)
utils.print_out(
"# Final, step %d lr %g "
"step-time %.2f wps %.2fK ppl %.2f, %s, %s" %
(global_step,
loaded_train_model.learning_rate.eval(session=train_sess),
avg_step_time, speed, train_ppl, result_summary, time.ctime()), log_f)
utils.print_time("# Done training!", start_train_time)
summary_writer.close()
utils.print_out("# Start evaluating saved best models.")
for metric in hparams.metrics:
best_model_dir = getattr(hparams, "best_" + metric + "_dir")
summary_writer = tf.summary.FileWriter(
os.path.join(best_model_dir, summary_name), infer_model.graph)
result_summary, best_global_step, _, _, _, _ = run_full_eval(
best_model_dir, infer_model, infer_sess, eval_model, eval_sess,
hparams, summary_writer, sample_src_data, sample_tgt_data)
utils.print_out(
"# Best %s, step %d "
"step-time %.2f wps %.2fK, %s, %s" %
(metric, best_global_step, avg_step_time, speed, result_summary,
time.ctime()), log_f)
summary_writer.close()
return (dev_scores, test_scores, dev_ppl, test_ppl, global_step)
