def infer(model, checkpoint, output_file):
results_per_batch = restore_and_get_results(model,
checkpoint,
mode="infer")
if not model.on_horovod or model.hvd.rank() == 0:
model.finalize_inference(results_per_batch, output_file)
deco_print("Finished inference")
def maybe_print_logs(self, input_values, output_values, training_step):
x, len_x = input_values['source_tensors']
y, len_y = input_values['target_tensors']
# samples = output_values[0][0]
x_sample = x[0]
len_x_sample = len_x[0]
y_sample = y[0]
len_y_sample = len_y[0]
deco_print(
"Train Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"Train Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
return {}
def finalize_inference(self, results_per_batch, output_file):
out = open(output_file, 'w')
out.write('\t'.join(['Source', 'Pred', 'Label']) + '\n')
preds, labels = [], []
for results in results_per_batch:
for x, pred, y in results:
out.write('\t'.join([x, str(pred), str(y)]) + '\n')
preds.append(pred)
labels.append(y)
if len(labels) > 0 and labels[0] is not None:
preds = np.asarray(preds)
labels = np.asarray(labels)
deco_print(
"TEST Accuracy: {:.4f}".format(metrics.accuracy(labels,
preds)),
offset=4,
)
deco_print(
"TEST Precision: {:.4f} | Recall: {:.4f} | F1: {:.4f}".format(
metrics.precision(labels, preds),
metrics.recall(labels, preds), metrics.f1(labels, preds)),
offset=4,
)
return {}
def finalize_evaluation(self, results_per_batch, training_step=None):
accuracies = []
true_pos, pred_pos, actual_pos = 0.0, 0.0, 0.0
for results in results_per_batch:
if not 'accuracy' in results:
return {}
accuracies.append(results['accuracy'])
if 'true_pos' in results:
true_pos += results['true_pos']
pred_pos += results['pred_pos']
actual_pos += results['actual_pos']
deco_print(
"EVAL Accuracy: {:.4f}".format(np.mean(accuracies)),
offset=4,
)
if true_pos > 0:
prec = true_pos / pred_pos
rec = true_pos / actual_pos
f1 = 2.0 * prec * rec / (rec + prec)
deco_print(
"EVAL Precision: {:.4f} | Recall: {:.4f} | F1: {:.4f} | True pos: {}"
.format(prec, rec, f1, true_pos),
offset=4,
)
return {}
def maybe_evaluate(self, inputs_per_batch, outputs_per_batch):
total_word_lev = 0.0
total_word_count = 0.0
samples_count = 0
dataset_size = self.data_layer.get_size_in_samples()
for input_values, output_values in zip(inputs_per_batch, outputs_per_batch):
for gpu_id in range(self.num_gpus):
decoded_sequence = output_values[gpu_id]
decoded_texts = sparse_tensor_to_chars(
decoded_sequence,
self.data_layer.params['idx2char'],
)
for sample_id in range(self.params['batch_size_per_gpu']):
# this is necessary for correct processing of the last batch
if samples_count >= dataset_size:
break
samples_count += 1
# y is the third returned input value, thus input_values[2]
# len_y is the fourth returned input value
y = input_values[2][gpu_id][sample_id]
len_y = input_values[3][gpu_id][sample_id]
true_text = "".join(map(self.data_layer.params['idx2char'].get,
y[:len_y]))
pred_text = "".join(decoded_texts[sample_id])
total_word_lev += levenshtein(true_text.split(), pred_text.split())
total_word_count += len(true_text.split())
total_wer = 1.0 * total_word_lev / total_word_count
deco_print("Validation WER: {:.4f}".format(total_wer), offset=4)
return {
"Eval WER": total_wer,
}
def evaluate(model, checkpoint):
results_per_batch = restore_and_get_results(model, checkpoint, mode="eval")
if not model.on_horovod or model.hvd.rank() == 0:
eval_dict = model.finalize_evaluation(results_per_batch)
deco_print("Finished evaluation")
return eval_dict
return None
def evaluate(model, checkpoint):
results_per_batch = restore_and_get_results(model, checkpoint, mode="eval")
if not model.on_horovod or model.hvd.rank() == 0:
eval_dict = model.finalize_evaluation(results_per_batch)
deco_print("Finished evaluation")
return eval_dict
else:
return None
def build_layer(inputs,
layer,
layer_params,
data_format,
regularizer,
training,
verbose=True):
"""This function builds a layer from the layer function and it's parameters.
It will automatically add regularizer parameter to the layer_params if the
layer supports regularization. To check this, it will look for the
"regularizer", "kernel_regularizer" and "gamma_regularizer" names in this
order in the ``layer`` call signature. If one of this parameters is supported
it will pass regularizer object as a value for that parameter. Based on the
same "checking signature" technique "data_format" and "training" parameters
will try to be added.
Args:
inputs: input Tensor that will be passed to the layer. Note that layer has
to accept input as the first parameter.
layer: layer function or class with ``__call__`` method defined.
layer_params (dict): parameters passed to the ``layer``.
data_format (string): data format ("channels_first" or "channels_last")
that will be tried to be passed as an additional argument.
regularizer: regularizer instance that will be tried to be passed as an
additional argument.
training (bool): whether layer is built in training mode. Will be tried to
be passed as an additional argument.
verbose (bool): whether to print information about built layers.
Returns:
Tensor with layer output.
"""
layer_params_cp = copy.deepcopy(layer_params)
for reg_name in ['regularizer', 'kernel_regularizer', 'gamma_regularizer']:
if reg_name not in layer_params_cp and \
reg_name in signature(layer).parameters:
layer_params_cp.update({reg_name: regularizer})
if 'data_format' not in layer_params_cp and \
'data_format' in signature(layer).parameters:
layer_params_cp.update({'data_format': data_format})
if 'training' not in layer_params_cp and \
'training' in signature(layer).parameters:
layer_params_cp.update({'training': training})
outputs = layer(inputs, **layer_params_cp)
if verbose:
if hasattr(layer, '_tf_api_names'):
layer_name = layer._tf_api_names[0]
else:
layer_name = layer
deco_print("Building layer: {}(inputs, {})".format(
layer_name, ", ".join("{}={}".format(key, value)
for key, value in layer_params_cp.items())))
return outputs
def infer(model, checkpoint, output_file):
results_per_batch = restore_and_get_results(
model,
checkpoint,
mode="infer",
detailed_inference_outputs=model.params.get("verbose_inference",
False),
save_mels=model.params.get("save_mels", False))
if not model.on_horovod or model.hvd.rank() == 0:
deco_print("Finished inference")
def finalize_evaluation(self, results_per_batch):
total_word_lev = 0.0
total_word_count = 0.0
for word_lev, word_count in results_per_batch:
total_word_lev += word_lev
total_word_count += word_count
total_wer = 1.0 * total_word_lev / total_word_count
deco_print("Validation WER: {:.4f}".format(total_wer), offset=4)
return {
"Eval WER": total_wer,
}
def finalize_evaluation(self, results_per_batch, training_step=None):
total_word_lev = 0.0
total_word_count = 0.0
for word_lev, word_count in results_per_batch:
total_word_lev += word_lev
total_word_count += word_count
total_wer = 1.0 * total_word_lev / total_word_count
deco_print("Validation WER: {:.4f}".format(total_wer), offset=4)
return {
"Eval WER": total_wer,
}
def run():
"""This function executes a saved checkpoint for
50 LibriSpeech dev clean files whose alignments are stored in
calibration/target.json
This function saves a pickle file with logits after running
through the model as calibration/sample.pkl
:return: None
"""
args, base_config, base_model, config_module = get_calibration_config(
sys.argv[1:])
config_module["infer_params"]["data_layer_params"]["dataset_files"] = \
["calibration/sample.csv"]
config_module["base_params"]["decoder_params"][
"infer_logits_to_pickle"] = True
load_model = base_config.get('load_model', None)
restore_best_checkpoint = base_config.get('restore_best_checkpoint', False)
base_ckpt_dir = check_base_model_logdir(load_model, args,
restore_best_checkpoint)
base_config['load_model'] = base_ckpt_dir
# Check logdir and create it if necessary
checkpoint = check_logdir(args, base_config, restore_best_checkpoint)
# Initilize Horovod
if base_config['use_horovod']:
import horovod.tensorflow as hvd
hvd.init()
if hvd.rank() == 0:
deco_print("Using horovod")
from mpi4py import MPI
MPI.COMM_WORLD.Barrier()
else:
hvd = None
if args.enable_logs:
if hvd is None or hvd.rank() == 0:
old_stdout, old_stderr, stdout_log, stderr_log = create_logdir(
args, base_config)
base_config['logdir'] = os.path.join(base_config['logdir'], 'logs')
if args.mode == 'infer':
if hvd is None or hvd.rank() == 0:
deco_print("Loading model from {}".format(checkpoint))
else:
print("Run in infer mode only")
sys.exit()
with tf.Graph().as_default():
model = create_model(args, base_config, config_module, base_model, hvd,
checkpoint)
infer(model, checkpoint, args.infer_output_file)
return args.calibration_out
def _build_forward_pass_graph(self, input_tensors, gpu_id=0):
"""TensorFlow graph for sequence-to-sequence model is created here.
This function connects encoder, decoder and loss together. As an input for
encoder it will specify source sequence and source length (as returned from
the data layer). As an input for decoder it will specify target sequence
and target length as well as all output returned from encoder. For loss it
will also specify target sequence and length and all output returned from
decoder. Note that loss will only be built for mode == "train" or "eval".
See :meth:`models.model.Model._build_forward_pass_graph` for description of
arguments and return values.
"""
if self.mode == "infer":
src_sequence, src_length = input_tensors
tgt_sequence, tgt_length = None, None
else:
src_sequence, src_length, tgt_sequence, tgt_length = input_tensors
with tf.variable_scope("ForwardPass"):
encoder_input = {
"src_sequence": src_sequence,
"src_length": src_length,
}
encoder_output = self.encoder.encode(input_dict=encoder_input)
tgt_length_eval = tf.cast(1.2 * tf.cast(src_length, tf.float32),
tf.int32)
decoder_input = {
"encoder_output":
encoder_output,
"tgt_sequence":
tgt_sequence,
# when the mode is not "train", replacing correct tgt_length with
# somewhat increased src_length
"tgt_length":
tgt_length if self.mode == "train" else tgt_length_eval
}
decoder_output = self.decoder.decode(input_dict=decoder_input)
decoder_samples = decoder_output.get("samples", None)
if self.mode == "train" or self.mode == "eval":
with tf.variable_scope("Loss"):
loss_input_dict = {
"decoder_output": decoder_output,
"tgt_sequence": tgt_sequence,
"tgt_length": tgt_length,
}
loss = self.loss_computator.compute_loss(loss_input_dict)
else:
deco_print("Inference Mode. Loss part of graph isn't built.")
loss = None
return loss, decoder_samples
def finalize_evaluation(self, results_per_batch, training_step=None):
preds, targets = [], []
for preds_cur, targets_cur in results_per_batch:
if self.params.get('eval_using_bleu', True):
preds.extend(preds_cur)
targets.extend(targets_cur)
if self.params.get('eval_using_bleu', True):
eval_bleu = calculate_bleu(preds, targets)
deco_print("Eval BLUE score: {}".format(eval_bleu), offset=4)
return {'Eval_BLEU_Score': eval_bleu}
return {}
def finalize_evaluation(self, results_per_batch):
preds, targets = [], []
for preds_cur, targets_cur in results_per_batch:
if self.params.get('eval_using_bleu', True):
preds.extend(preds_cur)
targets.extend(targets_cur)
if self.params.get('eval_using_bleu', True):
eval_bleu = calculate_bleu(preds, targets)
deco_print("Eval BLUE score: {}".format(eval_bleu), offset=4)
return {'Eval_BLEU_Score': eval_bleu}
return {}
def after_run(self, run_context, run_values):
results, step = run_values.results
self._iter_count = step
if not results:
return
self._timer.update_last_triggered_step(self._iter_count - 1)
if self._model.steps_in_epoch is None:
deco_print("Global step {}:".format(step), end=" ")
else:
deco_print(
"Epoch {}, global step {}:".format(
step // self._model.steps_in_epoch, step),
end=" ",
)
loss = results[0]
deco_print("loss = {:.4f}".format(loss), start="", end=", ")
tm = (time.time() - self._last_time) / self._every_steps
m, s = divmod(tm, 60)
h, m = divmod(m, 60)
deco_print(
"time per step = {}:{:02}:{:.3f}".format(int(h), int(m), s),
start="",
)
self._last_time = time.time()
def infer(self, input_values, output_values):
vocab = self.get_data_layer().corp.dictionary.idx2word
seed_tokens = self.params['encoder_params']['seed_tokens']
for i in range(len(seed_tokens)):
print(output_values[0][i].shape)
print('Seed:', vocab[seed_tokens[i]] + '\n')
deco_print(
"Output: " + array_to_string(
output_values[0][i],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
def after_run(self, run_context, run_values):
results, step = run_values.results
self._iter_count = step
if not self._triggered and step != self._last_step - 1:
return
self._timer.update_last_triggered_step(self._iter_count - 1)
deco_print("Running evaluation on a validation set:")
inputs_per_batch, outputs_per_batch = [], []
total_loss = 0.0
for cnt, feed_dict in enumerate(
self._model.data_layer.iterate_one_epoch(cross_over=True)):
loss, inputs, outputs = run_context.session.run(
self._fetches,
feed_dict,
)
inputs_per_batch.append(inputs)
outputs_per_batch.append(outputs)
total_loss += loss
total_loss /= (cnt + 1)
deco_print("Validation loss: {:.4f}".format(total_loss), offset=4)
dict_to_log = self._model.maybe_evaluate(
inputs_per_batch,
outputs_per_batch,
)
dict_to_log['eval_loss'] = total_loss
# saving the best validation model
if total_loss < self._best_eval_loss:
self._best_eval_loss = total_loss
self._eval_saver.save(
run_context.session,
os.path.join(self._model.params['logdir'], 'best_models',
'val_loss={:.4f}-step'.format(total_loss)),
global_step=step + 1,
)
# optionally logging to tensorboard any values
# returned from maybe_print_logs
if dict_to_log:
log_summaries_from_dict(
dict_to_log,
self._model.params['logdir'],
step,
)
def main():
# Parse args and create config
args, base_config, base_model, config_module = get_base_config(
sys.argv[1:])
if args.mode == "interactive_infer":
raise ValueError(
"Interactive infer is meant to be run from an IPython",
"notebook not from run.py.")
# Initilize Horovod
if base_config['use_horovod']:
import horovod.tensorflow as hvd
hvd.init()
if hvd.rank() == 0:
deco_print("Using horovod")
else:
hvd = None
restore_best_checkpoint = base_config.get('restore_best_checkpoint', False)
# Check logdir and create it if necessary
checkpoint = check_logdir(args, base_config, restore_best_checkpoint)
if args.enable_logs:
if hvd is None or hvd.rank() == 0:
old_stdout, old_stderr, stdout_log, stderr_log = create_logdir(
args, base_config)
base_config['logdir'] = os.path.join(base_config['logdir'], 'logs')
if args.mode == 'train' or args.mode == 'train_eval' or args.benchmark:
if hvd is None or hvd.rank() == 0:
if checkpoint is None or args.benchmark:
deco_print("Starting training from scratch")
else:
deco_print(
"Restored checkpoint from {}. Resuming training".format(
checkpoint), )
elif args.mode == 'eval' or args.mode == 'infer':
if hvd is None or hvd.rank() == 0:
deco_print("Loading model from {}".format(checkpoint))
# Create model and train/eval/infer
with tf.Graph().as_default():
model = create_model(args, base_config, config_module, base_model, hvd)
if args.mode == "train_eval":
train(model[0], model[1], debug_port=args.debug_port)
elif args.mode == "train":
train(model, None, debug_port=args.debug_port)
elif args.mode == "eval":
evaluate(model, checkpoint)
elif args.mode == "infer":
infer(model, checkpoint, args.infer_output_file, args.use_trt)
if args.enable_logs and (hvd is None or hvd.rank() == 0):
sys.stdout = old_stdout
sys.stderr = old_stderr
stdout_log.close()
stderr_log.close()
def __init__(self, params, model, name="ctc_loss"):
"""CTC loss constructor.
See parent class for arguments description.
Config parameters:
* **mask_nan** (bool) --- whether to mask nans in the loss output. Defaults
to True.
"""
super(CTCLoss, self).__init__(params, model, name)
self._mask_nan = self.params.get("mask_nan", True)
# this loss can only operate in full precision
if self.params['dtype'] != tf.float32:
deco_print("Warning: defaulting CTC loss to work in float32")
self.params['dtype'] = tf.float32
def __init__(self, params, model, name="ctc_loss"):
"""CTC loss constructor.
See parent class for arguments description.
Config parameters:
* **mask_nan** (bool) --- whether to mask nans in the loss output. Defaults
to True.
"""
super(CTCLoss, self).__init__(params, model, name)
self._mask_nan = self.params.get("mask_nan", True)
# this loss can only operate in full precision
if self.params['dtype'] != tf.float32:
deco_print("Warning: defaulting CTC loss to work in float32")
self.params['dtype'] = tf.float32
def finalize_evaluation(self, results_per_batch, training_step=None):
top1 = 0.0
top5 = 0.0
total = 0.0
for cur_total, cur_top1, cur_top5 in results_per_batch:
top1 += cur_top1
top5 += cur_top5
total += cur_total
top1 = 1.0 * top1 / total
top5 = 1.0 * top5 / total
deco_print("Validation top-1: {:.4f}".format(top1), offset=4)
deco_print("Validation top-5: {:.4f}".format(top5), offset=4)
return {
"Eval top-1": top1,
"Eval top-5": top5,
}
def maybe_print_logs(self, input_values, output_values, training_step):
labels = input_values['target_tensors'][0]
logits = output_values[0]
labels = np.where(labels == 1)[1]
total = logits.shape[0]
top1 = np.sum(np.argmax(logits, axis=1) == labels)
top5 = np.sum(labels[:, np.newaxis] == np.argpartition(logits, -5)[:, -5:])
top1 = 1.0 * top1 / total
top5 = 1.0 * top5 / total
deco_print("Train batch top-1: {:.4f}".format(top1), offset=4)
deco_print("Train batch top-5: {:.4f}".format(top5), offset=4)
return {
"Train batch top-1": top1,
"Train batch top-5": top5,
}
def after_run(self, run_context, run_values):
results, step = run_values.results
self._iter_count = step
if not self._triggered and step != self._last_step - 1:
return
self._timer.update_last_triggered_step(self._iter_count - 1)
if not self._model.on_horovod or self._model.hvd.rank() == 0:
deco_print("Running evaluation on a validation set:")
results_per_batch, total_loss = get_results_for_epoch(
self._model,
run_context.session,
mode="eval",
compute_loss=True,
)
if not self._model.on_horovod or self._model.hvd.rank() == 0:
deco_print("Validation loss: {:.4f}".format(total_loss), offset=4)
dict_to_log = self._model.finalize_evaluation(
results_per_batch, step)
dict_to_log['eval_loss'] = total_loss
# saving the best validation model
if self._model.params['save_checkpoint_steps'] and \
total_loss < self._best_eval_loss:
self._best_eval_loss = total_loss
self._eval_saver.save(
run_context.session,
os.path.join(self._model.params['logdir'], 'best_models',
'val_loss={:.4f}-step'.format(total_loss)),
global_step=step + 1,
)
# optionally logging to tensorboard any values
# returned from maybe_print_logs
if self._model.params['save_summaries_steps']:
log_summaries_from_dict(
dict_to_log,
self._model.params['logdir'],
step,
)
def infer(self, inputs_per_batch, outputs_per_batch, output_file):
# this function assumes it is run on 1 gpu with batch size of 1
with codecs.open(output_file, 'w', 'utf-8') as fout:
for step in range(len(inputs_per_batch)):
input_values = inputs_per_batch[step][0][0]
output_values = outputs_per_batch[step][0]
output_string = text_ids_to_string(
output_values[0],
self.data_layer.params['target_idx2seq'],
S_ID=self.decoder.params['GO_SYMBOL'],
EOS_ID=self.decoder.params['END_SYMBOL'],
PAD_ID=self.decoder.params['PAD_SYMBOL'],
ignore_special=True,
delim=' ',
)
input_string = text_ids_to_string(
input_values[0],
self.data_layer.params['source_idx2seq'],
S_ID=self.decoder.params['GO_SYMBOL'],
EOS_ID=self.decoder.params['END_SYMBOL'],
PAD_ID=self.decoder.params['PAD_SYMBOL'],
ignore_special=True,
delim=' ',
)
fout.write(output_string + "\n")
if step % 200 == 0:
if six.PY2:
input_string = input_string.encode('utf-8')
output_string = output_string.encode('utf-8')
deco_print("Input sequence: {}".format(input_string))
deco_print("Output sequence: {}".format(output_string))
deco_print("")
def get_batches_for_epoch(model, checkpoint):
total_time = 0.0
bench_start = model.params.get('bench_start', 10)
saver = tf.train.Saver()
sess_config = tf.ConfigProto(allow_soft_placement=True)
sess_config.gpu_options.allow_growth = True
with tf.Session(config=sess_config) as sess:
saver.restore(sess, checkpoint)
inputs_per_batch, outputs_per_batch = [], []
fetches = [
model.data_layer.get_input_tensors(),
model.get_output_tensors()
]
total_batches = model.data_layer.get_size_in_batches()
for step, feed_dict in enumerate(
model.data_layer.iterate_one_epoch(cross_over=True)):
tm = time.time()
inputs, outputs = sess.run(fetches, feed_dict)
if step >= bench_start:
total_time += time.time() - tm
inputs_per_batch.append(inputs)
outputs_per_batch.append(outputs)
ending = '\r' if step < total_batches - 1 else '\n'
deco_print("Processed {}/{} batches".format(
step + 1, total_batches),
end=ending)
if step > bench_start:
deco_print("Avg time per step: {:.3}s".format(1.0 * total_time /
(step - bench_start)))
else:
deco_print("Not enough steps for benchmarking")
return inputs_per_batch, outputs_per_batch
def maybe_print_logs(self, input_values, output_values):
x, len_x = input_values['source_tensors']
y, len_y = input_values['target_tensors']
samples = output_values[0]
x_sample = x[0]
len_x_sample = len_x[0]
y_sample = y[0]
len_y_sample = len_y[0]
deco_print(
"Train Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().params['source_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"Train Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"Train Prediction[0]: " + array_to_string(
samples[0, :],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
return {}
def maybe_print_logs(self, input_values, output_values):
x, len_x, y, len_y = input_values
decoded_sequence = output_values
# using only the first sample from the batch on the first gpu, thus y[0][0]
if self.on_horovod:
y_one_sample = y[0]
len_y_one_sample = len_y[0]
decoded_sequence_one_batch = decoded_sequence[0]
else:
y_one_sample = y[0][0]
len_y_one_sample = len_y[0][0]
decoded_sequence_one_batch = decoded_sequence[0]
# we also clip the sample by the correct length
true_text = "".join(map(
self.data_layer.params['idx2char'].get,
y_one_sample[:len_y_one_sample],
))
pred_text = "".join(sparse_tensor_to_chars(
decoded_sequence_one_batch, self.data_layer.params['idx2char'])[0]
)
sample_wer = levenshtein(true_text.split(), pred_text.split()) / \
len(true_text.split())
deco_print("Sample WER: {:.4f}".format(sample_wer), offset=4)
deco_print("Sample target: " + true_text, offset=4)
deco_print("Sample prediction: " + pred_text, offset=4)
return {
'Sample WER': sample_wer,
}
def maybe_print_logs(self, input_values, output_values):
x, len_x = input_values['source_tensors']
y, len_y = input_values['target_tensors']
samples = output_values[0]
x_sample = x[0]
len_x_sample = len_x[0]
y_sample = y[0]
len_y_sample = len_y[0]
deco_print(
"Train Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().params['source_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"Train Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"Train Prediction[0]: " + array_to_string(
samples[0, :],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
return {}
def maybe_print_logs(self, input_values, output_values):
y, len_y = input_values['target_tensors']
decoded_sequence = output_values
y_one_sample = y[0]
len_y_one_sample = len_y[0]
decoded_sequence_one_batch = decoded_sequence[0]
# we also clip the sample by the correct length
true_text = "".join(
map(
self.get_data_layer().params['idx2char'].get,
y_one_sample[:len_y_one_sample],
))
pred_text = "".join(
sparse_tensor_to_chars(
decoded_sequence_one_batch,
self.get_data_layer().params['idx2char'])[0])
sample_wer = levenshtein(true_text.split(), pred_text.split()) / \
len(true_text.split())
deco_print("Sample WER: {:.4f}".format(sample_wer), offset=4)
deco_print("Sample target: " + true_text, offset=4)
deco_print("Sample prediction: " + pred_text, offset=4)
return {
'Sample WER': sample_wer,
}
def evaluate(self, input_values, output_values):
ex, elen_x = input_values['source_tensors']
ey, elen_y = input_values['target_tensors']
x_sample = ex[0]
len_x_sample = elen_x[0]
y_sample = ey[0]
len_y_sample = elen_y[0]
deco_print(
"*****EVAL Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"*****EVAL Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
samples = output_values[0][0]
deco_print(
"*****EVAL Prediction[0]: " + array_to_string(
samples,
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
def after_run(self, run_context, run_values):
results, step = run_values.results
self._iter_count = step
if not self._triggered and step != self._last_step - 1:
return
self._timer.update_last_triggered_step(self._iter_count - 1)
if not self._model.on_horovod or self._model.hvd.rank() == 0:
deco_print("Running evaluation on a validation set:")
results_per_batch, total_loss = get_results_for_epoch(
self._model, run_context.session, mode="eval", compute_loss=True,
)
if not self._model.on_horovod or self._model.hvd.rank() == 0:
deco_print("Validation loss: {:.4f}".format(total_loss), offset=4)
dict_to_log = self._model.finalize_evaluation(results_per_batch)
dict_to_log['eval_loss'] = total_loss
# saving the best validation model
if total_loss < self._best_eval_loss:
self._best_eval_loss = total_loss
self._eval_saver.save(
run_context.session,
os.path.join(self._model.params['logdir'], 'best_models',
'val_loss={:.4f}-step'.format(total_loss)),
global_step=step + 1,
)
# optionally logging to tensorboard any values
# returned from maybe_print_logs
if dict_to_log:
log_summaries_from_dict(
dict_to_log,
self._model.params['logdir'],
step,
)
def after_run(self, run_context, run_values):
results, step = run_values.results
self._iter_count = step
if not results:
return
self._timer.update_last_triggered_step(self._iter_count - 1)
if self._model.steps_in_epoch is None:
deco_print("Global step {}:".format(step), end=" ")
else:
deco_print(
"Epoch {}, global step {}:".format(
step // self._model.steps_in_epoch, step),
end=" ",
)
loss = results[0]
if not self._model.on_horovod or self._model.hvd.rank() == 0:
if self._print_ppl:
deco_print("Train loss: {:.4f} | ppl = {:.4f} | bpc = {:.4f}"
.format(loss, math.exp(loss),
loss/math.log(2)),
start="", end=", ")
else:
deco_print(
"Train loss: {:.4f} ".format(loss),
offset=4)
tm = (time.time() - self._last_time) / self._every_steps
m, s = divmod(tm, 60)
h, m = divmod(m, 60)
deco_print(
"time per step = {}:{:02}:{:.3f}".format(int(h), int(m), s),
start="",
)
self._last_time = time.time()
def evaluate(self, input_values, output_values):
ex, elen_x = input_values['source_tensors']
ey, elen_y = input_values['target_tensors']
x_sample = ex[0]
len_x_sample = elen_x[0]
y_sample = ey[0]
len_y_sample = elen_y[0]
deco_print(
"*****EVAL Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().params['source_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"*****EVAL Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
samples = output_values[0]
deco_print(
"*****EVAL Prediction[0]: " + array_to_string(
samples[0, :],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
preds, targets = [], []
if self.params.get('eval_using_bleu', True):
preds.extend([
transform_for_bleu(
sample,
vocab=self.get_data_layer().params['target_idx2seq'],
ignore_special=True,
delim=self.get_data_layer().params["delimiter"],
bpe_used=self.params.get('bpe_used', False),
) for sample in samples
])
targets.extend([[
transform_for_bleu(
yi,
vocab=self.get_data_layer().params['target_idx2seq'],
ignore_special=True,
delim=self.get_data_layer().params["delimiter"],
bpe_used=self.params.get('bpe_used', False),
)
] for yi in ey])
return preds, targets
def infer(self, input_values, output_values):
if self._lm_phase:
vocab = self.get_data_layer().corp.dictionary.idx2word
seed_tokens = self.params['encoder_params']['seed_tokens']
for i in range(len(seed_tokens)):
print('Seed:', vocab[seed_tokens[i]] + '\n')
deco_print(
"Output: " + array_to_string(
output_values[0][i],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.delimiter,
),
offset=4,
)
return []
else:
ex, elen_x = input_values['source_tensors']
ey, elen_y = None, None
if 'target_tensors' in input_values:
ey, elen_y = input_values['target_tensors']
n_samples = len(ex)
results = []
for i in range(n_samples):
current_x = array_to_string(
ex[i][:elen_x[i]],
vocab=self.get_data_layer().corp.dictionary.idx2word,
delim=self.delimiter,
),
current_pred = np.argmax(output_values[0][i])
curret_y = None
if ey is not None:
current_y = np.argmax(ey[i])
results.append((current_x[0], current_pred, current_y))
return results
def finalize_inference(self, results_per_batch, output_file):
with codecs.open(output_file, 'w', 'utf-8') as fout:
step = 0
for input_strings, output_strings in results_per_batch:
for input_string, output_string in zip(input_strings, output_strings):
fout.write(output_string + "\n")
if step % 200 == 0:
deco_print("Input sequence: {}".format(input_string))
deco_print("Output sequence: {}".format(output_string))
deco_print("")
step += 1
def finalize_inference(self, results_per_batch, output_file):
with codecs.open(output_file, 'w', 'utf-8') as fout:
step = 0
for input_strings, output_strings in results_per_batch:
for input_string, output_string in zip(input_strings, output_strings):
fout.write(output_string + "\n")
if step % 200 == 0:
deco_print("Input sequence: {}".format(input_string))
deco_print("Output sequence: {}".format(output_string))
deco_print("")
step += 1
def evaluate(self, input_values, output_values):
ex, elen_x = input_values['source_tensors']
ey, elen_y = input_values['target_tensors']
x_sample = ex[0]
len_x_sample = elen_x[0]
y_sample = ey[0]
len_y_sample = elen_y[0]
deco_print(
"*****EVAL Source[0]: " + array_to_string(
x_sample[:len_x_sample],
vocab=self.get_data_layer().params['source_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
deco_print(
"*****EVAL Target[0]: " + array_to_string(
y_sample[:len_y_sample],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
samples = output_values[0]
deco_print(
"*****EVAL Prediction[0]: " + array_to_string(
samples[0, :],
vocab=self.get_data_layer().params['target_idx2seq'],
delim=self.get_data_layer().params["delimiter"],
),
offset=4,
)
preds, targets = [], []
if self.params.get('eval_using_bleu', True):
preds.extend([transform_for_bleu(
sample,
vocab=self.get_data_layer().params['target_idx2seq'],
ignore_special=True,
delim=self.get_data_layer().params["delimiter"],
bpe_used=self.params.get('bpe_used', False),
) for sample in samples])
targets.extend([[transform_for_bleu(
yi,
vocab=self.get_data_layer().params['target_idx2seq'],
ignore_special=True,
delim=self.get_data_layer().params["delimiter"],
bpe_used=self.params.get('bpe_used', False),
)] for yi in ey])
return preds, targets
def maybe_print_logs(self, input_values, output_values):
y, len_y = input_values['target_tensors']
decoded_sequence = output_values
y_one_sample = y[0]
len_y_one_sample = len_y[0]
decoded_sequence_one_batch = decoded_sequence[0]
# we also clip the sample by the correct length
true_text = "".join(map(
self.get_data_layer().params['idx2char'].get,
y_one_sample[:len_y_one_sample],
))
pred_text = "".join(sparse_tensor_to_chars(
decoded_sequence_one_batch, self.get_data_layer().params['idx2char'])[0]
)
sample_wer = levenshtein(true_text.split(), pred_text.split()) / \
len(true_text.split())
deco_print("Sample WER: {:.4f}".format(sample_wer), offset=4)
deco_print("Sample target: " + true_text, offset=4)
deco_print("Sample prediction: " + pred_text, offset=4)
return {
'Sample WER': sample_wer,
}
def infer(model, checkpoint, output_file):
results_per_batch = restore_and_get_results(model, checkpoint, mode="infer")
if not model.on_horovod or model.hvd.rank() == 0:
model.finalize_inference(results_per_batch, output_file)
deco_print("Finished inference")
def train(train_model, eval_model=None, debug_port=None):
if eval_model is not None and 'eval_steps' not in eval_model.params:
raise ValueError("eval_steps parameter has to be specified "
"if eval_model is provided")
hvd = train_model.hvd
if hvd:
master_worker = hvd.rank() == 0
else:
master_worker = True
# initializing session parameters
sess_config = tf.ConfigProto(allow_soft_placement=True)
sess_config.gpu_options.allow_growth = True
if hvd is not None:
sess_config.gpu_options.visible_device_list = str(hvd.local_rank())
# defining necessary hooks
hooks = [tf.train.StopAtStepHook(last_step=train_model.last_step)]
if hvd is not None:
hooks.append(BroadcastGlobalVariablesHook(0))
if master_worker:
checkpoint_dir = train_model.params['logdir']
else:
checkpoint_dir = None
if eval_model is not None:
# noinspection PyTypeChecker
hooks.append(
RunEvaluationHook(
every_steps=eval_model.params['eval_steps'],
model=eval_model,
last_step=train_model.last_step,
),
)
if master_worker:
if train_model.params['save_checkpoint_steps'] is not None:
# noinspection PyTypeChecker
saver = tf.train.Saver(save_relative_paths=True)
hooks.append(tf.train.CheckpointSaverHook(
checkpoint_dir,
saver=saver,
save_steps=train_model.params['save_checkpoint_steps']),
)
if train_model.params['print_loss_steps'] is not None:
# noinspection PyTypeChecker
hooks.append(PrintLossAndTimeHook(
every_steps=train_model.params['print_loss_steps'],
model=train_model,
))
if train_model.params['print_samples_steps'] is not None:
# noinspection PyTypeChecker
hooks.append(PrintSamplesHook(
every_steps=train_model.params['print_samples_steps'],
model=train_model,
))
total_time = 0.0
bench_start = train_model.params.get('bench_start', 10)
if debug_port:
hooks.append(
tf_debug.TensorBoardDebugHook("localhost:{}".format(debug_port))
)
if train_model.on_horovod:
init_data_layer = train_model.get_data_layer().iterator.initializer
else:
init_data_layer = tf.group(
[train_model.get_data_layer(i).iterator.initializer
for i in range(train_model.num_gpus)]
)
scaffold = tf.train.Scaffold(
local_init_op=tf.group(tf.local_variables_initializer(), init_data_layer)
)
fetches = [train_model.train_op]
try:
total_objects = 0.0
# on horovod num_gpus is 1
for worker_id in range(train_model.num_gpus):
fetches.append(train_model.get_num_objects_per_step(worker_id))
except NotImplementedError:
deco_print("WARNING: Can't compute number of objects per step, since "
"train model does not define get_num_objects_per_step method.")
# starting training
with tf.train.MonitoredTrainingSession(
scaffold=scaffold,
checkpoint_dir=checkpoint_dir,
save_summaries_steps=train_model.params['save_summaries_steps'],
config=sess_config,
save_checkpoint_secs=None,
log_step_count_steps=train_model.params['save_summaries_steps'],
stop_grace_period_secs=300,
hooks=hooks,
) as sess:
step = 0
while True:
if sess.should_stop():
break
tm = time.time()
try:
fetches_vals = sess.run(fetches)
except tf.errors.OutOfRangeError:
break
if step >= bench_start:
total_time += time.time() - tm
if len(fetches) > 1:
for i in range(train_model.num_gpus):
total_objects += np.sum(fetches_vals[i + 1])
step += 1
if hvd is not None:
deco_print("Finished training on rank {}".format(hvd.rank()))
else:
deco_print("Finished training")
if train_model.on_horovod:
ending = " on worker {}".format(hvd.rank())
else:
ending = ""
if step > bench_start:
deco_print(
"Avg time per step{}: {:.3f}s".format(
ending, 1.0 * total_time / (step - bench_start))
)
if len(fetches) > 1:
deco_print(
"Avg objects per second{}: {:.3f}".format(
ending, 1.0 * total_objects / total_time)
)
else:
deco_print("Not enough steps for benchmarking{}".format(ending))
def _build_forward_pass_graph(self, input_tensors, gpu_id=0):
"""TensorFlow graph for encoder-decoder-loss model is created here.
This function connects encoder, decoder and loss together. As an input for
encoder it will specify source tensors (as returned from
the data layer). As an input for decoder it will specify target tensors
as well as all output returned from encoder. For loss it
will also specify target tensors and all output returned from
decoder. Note that loss will only be built for mode == "train" or "eval".
Args:
input_tensors (dict): ``input_tensors`` dictionary that has to contain
``source_tensors`` key with the list of all source tensors, and
``target_tensors`` with the list of all target tensors. Note that
``target_tensors`` only need to be provided if mode is
"train" or "eval".
gpu_id (int, optional): id of the GPU where the current copy of the model
is constructed. For Horovod this is always zero.
Returns:
tuple: tuple containing loss tensor as returned from
``loss.compute_loss()`` and samples tensor, which is taken from
``decoder.decode()['samples']``. When ``mode == 'infer'``, loss will
be None.
"""
if not isinstance(input_tensors, dict) or \
'source_tensors' not in input_tensors:
raise ValueError('Input tensors should be a dict containing '
'"source_tensors" key')
if not isinstance(input_tensors['source_tensors'], list):
raise ValueError('source_tensors should be a list')
source_tensors = input_tensors['source_tensors']
if self.mode == "train" or self.mode == "eval":
if 'target_tensors' not in input_tensors:
raise ValueError('Input tensors should contain "target_tensors" key'
'when mode != "infer"')
if not isinstance(input_tensors['target_tensors'], list):
raise ValueError('target_tensors should be a list')
target_tensors = input_tensors['target_tensors']
with tf.variable_scope("ForwardPass"):
encoder_input = {"source_tensors": source_tensors}
encoder_output = self.encoder.encode(input_dict=encoder_input)
decoder_input = {"encoder_output": encoder_output}
if self.mode == "train":
decoder_input['target_tensors'] = target_tensors
decoder_output = self.decoder.decode(input_dict=decoder_input)
decoder_samples = decoder_output.get("samples", None)
if self.mode == "train" or self.mode == "eval":
with tf.variable_scope("Loss"):
loss_input_dict = {
"decoder_output": decoder_output,
"target_tensors": target_tensors,
}
loss = self.loss_computator.compute_loss(loss_input_dict)
else:
deco_print("Inference Mode. Loss part of graph isn't built.")
loss = None
return loss, decoder_samples
def compile(self, force_var_reuse=False):
"""TensorFlow graph is built here."""
if 'initializer' not in self.params:
initializer = None
else:
init_dict = self.params.get('initializer_params', {})
initializer = self.params['initializer'](**init_dict)
if not self.on_horovod: # not using Horovod
# below we follow data parallelism for multi-GPU training
losses = []
for gpu_cnt, gpu_id in enumerate(self._gpu_ids):
with tf.device("/gpu:{}".format(gpu_id)), tf.variable_scope(
name_or_scope=tf.get_variable_scope(),
# re-using variables across GPUs.
reuse=force_var_reuse or (gpu_cnt > 0),
initializer=initializer,
dtype=self.get_tf_dtype(),
):
deco_print("Building graph on GPU:{}".format(gpu_id))
self.get_data_layer(gpu_cnt).build_graph()
input_tensors = self.get_data_layer(gpu_cnt).input_tensors
loss, self._outputs[gpu_cnt] = self._build_forward_pass_graph(
input_tensors,
gpu_id=gpu_cnt,
)
if self._outputs[gpu_cnt] is not None and \
not isinstance(self._outputs[gpu_cnt], list):
raise ValueError('Decoder samples have to be either None or list')
if self._mode == "train" or self._mode == "eval":
losses.append(loss)
# end of for gpu_ind loop
if self._mode == "train":
self.loss = tf.reduce_mean(losses)
if self._mode == "eval":
self.eval_losses = losses
else: # is using Horovod
# gpu_id should always be zero, since Horovod takes care of isolating
# different processes to 1 GPU only
with tf.device("/gpu:0"), tf.variable_scope(
name_or_scope=tf.get_variable_scope(),
reuse=force_var_reuse,
initializer=initializer,
dtype=self.get_tf_dtype(),
):
deco_print(
"Building graph in Horovod rank: {}".format(self._hvd.rank())
)
self.get_data_layer().build_graph()
input_tensors = self.get_data_layer().input_tensors
loss, self._output = self._build_forward_pass_graph(input_tensors,
gpu_id=0)
if self._output is not None and not isinstance(self._output, list):
raise ValueError('Decoder samples have to be either None or list')
if self._mode == "train":
self.loss = loss
if self._mode == "eval":
self.eval_losses = [loss]
if self._mode == "train":
if 'lr_policy' not in self.params:
lr_policy = None
else:
lr_params = self.params.get('lr_policy_params', {})
# adding default decay_steps = max_steps if lr_policy supports it and
# different value is not provided
if 'decay_steps' in self.params['lr_policy'].__code__.co_varnames and \
'decay_steps' not in lr_params:
lr_params['decay_steps'] = self._last_step
if 'steps_per_epoch' in self.params['lr_policy'].__code__.co_varnames and \
'steps_per_epoch' not in lr_params and 'num_epochs' in self.params:
lr_params['steps_per_epoch'] = self.steps_in_epoch
lr_policy = lambda gs: self.params['lr_policy'](global_step=gs,
**lr_params)
self.train_op = optimize_loss(
loss=tf.cast(self.loss, tf.float32) + get_regularization_loss(),
dtype=self.params['dtype'],
optimizer=self.params['optimizer'],
optimizer_params=self.params.get('optimizer_params', {}),
gradient_noise_scale=None,
gradient_multipliers=None,
clip_gradients=self.params.get('max_grad_norm', None),
learning_rate_decay_fn=lr_policy,
update_ops=None,
variables=None,
name="Loss_Optimization",
summaries=self.params.get('summaries', None),
colocate_gradients_with_ops=True,
increment_global_step=True,
larc_params=self.params.get('larc_params', None),
loss_scale=self.params.get('loss_scale', 1.0),
automatic_loss_scaling=self.params.get('automatic_loss_scaling', None),
on_horovod=self.on_horovod,
)
tf.summary.scalar(name="train_loss", tensor=self.loss)
if self.steps_in_epoch:
tf.summary.scalar(
name="epoch",
tensor=tf.floor(tf.train.get_global_step() /
tf.constant(self.steps_in_epoch, dtype=tf.int64)),
)
if not self.on_horovod or self._hvd.rank() == 0:
deco_print("Trainable variables:")
total_params = 0
unknown_shape = False
for var in tf.trainable_variables():
var_params = 1
deco_print('{}'.format(var.name), offset=2)
deco_print('shape: {}, {}'.format(var.get_shape(), var.dtype),
offset=4)
if var.get_shape():
for dim in var.get_shape():
var_params *= dim.value
total_params += var_params
else:
unknown_shape = True
if unknown_shape:
deco_print("Encountered unknown variable shape, can't compute total "
"number of parameters.")
else:
deco_print('Total trainable parameters: {}'.format(total_params))
