def features_for_problem(problem_instance,
p_hparams,
hparams,
data_dir,
num_datashards,
mode,
batch_size=None,
dataset_split=None,
shard=None,
name="problem_inputs"):
"""Feature map for Problem."""
with tf.name_scope(name):
with tf.device("/cpu:0"): # Input reading on CPU
capacity = (p_hparams.max_expected_batch_size_per_shard * num_datashards)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=num_datashards,
drop_long_sequences=(mode == tf.estimator.ModeKeys.TRAIN or
hparams.eval_drop_long_sequences),
length_multiplier=(p_hparams.batch_size_multiplier))
if batch_size:
# If batch_size is fixed, use a single input bucket
batching_scheme["batch_sizes"] = [batch_size]
batching_scheme["boundaries"] = []
# Log new batching scheme if updated
tf.logging.info("Updated batching_scheme = %s", batching_scheme)
feature_map = data_reader.input_pipeline(
problem_instance,
data_dir,
capacity,
mode,
hparams,
batching_scheme,
dataset_split=dataset_split,
shard=shard)
# Ensure inputs and targets are proper rank.
if problem_instance.has_inputs: # always true for translation
while len(feature_map["inputs"].get_shape()) != 4:
feature_map["inputs"] = tf.expand_dims(feature_map["inputs"], axis=-1)
while len(feature_map["targets"].get_shape()) != 4:
feature_map["targets"] = tf.expand_dims(feature_map["targets"], axis=-1)
if problem_instance.has_inputs:
feature_map["input_space_id"] = tf.constant(p_hparams.input_space_id)
feature_map["target_space_id"] = tf.constant(p_hparams.target_space_id)
return feature_map
def features_for_problem(problem_instance,
p_hparams,
hparams,
data_dir,
num_datashards,
mode,
batch_size=None,
dataset_split=None,
shard=None,
name="problem_inputs"):
"""Feature map for Problem."""
with tf.name_scope(name):
with tf.device("/cpu:0"): # Input reading on CPU
capacity = (p_hparams.max_expected_batch_size_per_shard * num_datashards)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=num_datashards,
drop_long_sequences=(mode == tf.estimator.ModeKeys.TRAIN or
hparams.eval_drop_long_sequences),
length_multiplier=(p_hparams.batch_size_multiplier))
if batch_size:
# If batch_size is fixed, use a single input bucket
batching_scheme["batch_sizes"] = [batch_size]
batching_scheme["boundaries"] = []
# Log new batching scheme if updated
tf.logging.info("Updated batching_scheme = %s", batching_scheme)
feature_map = data_reader.input_pipeline(
problem_instance,
data_dir,
capacity,
mode,
hparams,
batching_scheme,
dataset_split=dataset_split,
shard=shard)
# Ensure inputs and targets are proper rank.
if problem_instance.has_inputs:
while len(feature_map["inputs"].get_shape()) != 4:
feature_map["inputs"] = tf.expand_dims(feature_map["inputs"], axis=-1)
while len(feature_map["targets"].get_shape()) != 4:
feature_map["targets"] = tf.expand_dims(feature_map["targets"], axis=-1)
if problem_instance.has_inputs:
feature_map["input_space_id"] = tf.constant(p_hparams.input_space_id)
feature_map["target_space_id"] = tf.constant(p_hparams.target_space_id)
return feature_map
def features_for_problem(problem_instance,
p_hparams,
hparams,
data_filepatterns,
num_datashards,
mode,
name="problem_inputs"):
"""Feature map for Problem."""
with tf.name_scope(name):
with tf.device("/cpu:0"): # Input reading on CPU
capacity = (p_hparams.max_expected_batch_size_per_shard *
num_datashards)
feature_map = data_reader.input_pipeline(
problem_instance, data_filepatterns, capacity, mode, hparams,
data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=num_datashards,
drop_long_sequences=(mode == tf.estimator.ModeKeys.TRAIN
or hparams.eval_drop_long_sequences),
length_multiplier=(p_hparams.batch_size_multiplier)))
# Reverse inputs and targets features if the problem was reversed.
if problem_instance is not None:
problem_instance.maybe_reverse_features(feature_map)
problem_instance.maybe_copy_features(feature_map)
else:
if p_hparams.was_reversed:
inputs = feature_map["inputs"]
targets = feature_map["targets"]
feature_map["inputs"] = targets
feature_map["targets"] = inputs
# Use the inputs as the targets if the problem is a copy problem.
if p_hparams.was_copy:
feature_map["targets"] = feature_map["inputs"]
# Ensure inputs and targets are proper rank.
while len(feature_map["inputs"].get_shape()) != 4:
feature_map["inputs"] = tf.expand_dims(feature_map["inputs"], axis=-1)
while len(feature_map["targets"].get_shape()) != 4:
feature_map["targets"] = tf.expand_dims(feature_map["targets"],
axis=-1)
feature_map["input_space_id"] = tf.constant(p_hparams.input_space_id)
feature_map["target_space_id"] = tf.constant(p_hparams.target_space_id)
return feature_map
def input_fn(self, # noqa: C901
mode,
hparams,
data_dir=None,
params=None,
config=None,
dataset_kwargs=None):
"""Builds input pipeline for problem.
Args:
mode: tf.estimator.ModeKeys
hparams: HParams, model hparams
data_dir: str, data directory; if None, will use hparams.data_dir
params: dict, may include "batch_size"
config: RunConfig; should have the data_parallelism attribute if not using
TPU
dataset_kwargs: dict, if passed, will pass as kwargs to self.dataset
method when called
Returns:
(features_dict<str name, Tensor feature>, Tensor targets)
"""
partition_id, num_partitions = self._dataset_partition(mode, config)
is_training = mode == tf.estimator.ModeKeys.TRAIN
if config and config.use_tpu:
num_threads = 64
else:
num_threads = 4 if is_training else 1
max_length = self.max_length(hparams)
def tpu_valid_size(example):
return data_reader.example_valid_size(
example,
hparams.min_length,
max_length
)
def gpu_valid_size(example):
drop_long_sequences = is_training or hparams.eval_drop_long_sequences
return data_reader.example_valid_size(
example,
hparams.min_length,
max_length
if drop_long_sequences else 10**9
)
def define_shapes(example):
batch_size = config and config.use_tpu and params["batch_size"]
return standardize_shapes(example, batch_size=batch_size)
# Read and preprocess
data_dir = data_dir or hparams.data_dir
dataset_kwargs = dataset_kwargs or {}
dataset_kwargs.update({
"mode": mode,
"data_dir": data_dir,
"num_threads": num_threads,
"hparams": hparams,
"partition_id": partition_id,
"num_partitions": num_partitions,
})
dataset = self.dataset(**dataset_kwargs)
if is_training:
# Repeat and skip a random number of records
dataset = dataset.repeat()
data_files = tf.contrib.slim.parallel_reader.get_data_files(
self.filepattern(data_dir, mode))
# In continuous_train_and_eval when switching between train and
# eval, this input_fn method gets called multiple times and it
# would give you the exact same samples from the last call
# (because the Graph seed is set). So this skip gives you some
# shuffling.
dataset = skip_random_fraction(dataset, data_files[0])
dataset = dataset.map(
data_reader.cast_int64_to_int32, num_parallel_calls=num_threads)
if self.batch_size_means_tokens:
batch_size_means_tokens = True
else:
if _are_shapes_fully_defined(dataset.output_shapes):
batch_size_means_tokens = False
else:
tf.logging.warning(
"Shapes are not fully defined. Assuming batch_size means tokens. "
"Override batch_size_means_tokens() "
"in your problem subclass if this is undesired behavior.")
batch_size_means_tokens = True
# Batching
if not batch_size_means_tokens:
# Batch size means examples per datashard.
if config and config.use_tpu:
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
dataset = dataset.apply(
tf.contrib.data.batch_and_drop_remainder(batch_size))
else:
num_shards = (config and config.data_parallelism.n) or 1
batch_size = hparams.batch_size * num_shards
dataset = dataset.batch(batch_size)
else:
# batch_size means tokens per datashard
if config and config.use_tpu:
dataset = dataset.filter(tpu_valid_size)
padded_shapes = self._pad_for_tpu(dataset.output_shapes, hparams)
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
dataset = dataset.apply(
tf.contrib.data.padded_batch_and_drop_remainder(
batch_size, padded_shapes))
else:
# On GPU, bucket by length
dataset = dataset.filter(gpu_valid_size)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=(config and config.data_parallelism.n) or 1,
length_multiplier=self.get_hparams().batch_size_multiplier)
if hparams.use_fixed_batch_size:
# Here batch_size really means examples per datashard.
batching_scheme["batch_sizes"] = [hparams.batch_size]
batching_scheme["boundaries"] = []
dataset = data_reader.bucket_by_sequence_length(
dataset, data_reader.example_length, batching_scheme["boundaries"],
batching_scheme["batch_sizes"])
if not is_training:
def _pad_batch(features):
if not config or config.data_parallelism.n <= 1:
return features
tf.logging.warn(
"Padding the batch to ensure that remainder eval batches have "
"a batch size divisible by the number of data shards. This may "
"lead to incorrect metrics for non-zero-padded features, e.g. "
"images. Use a single datashard (i.e. 1 GPU) in that case.")
return pad_batch(features, config.data_parallelism.n)
dataset = dataset.map(_pad_batch, num_parallel_calls=num_threads)
dataset = dataset.map(define_shapes, num_parallel_calls=num_threads)
dataset = dataset.prefetch(2)
features = dataset.make_one_shot_iterator().get_next()
if not config or not config.use_tpu:
_summarize_features(features, (config and config.data_parallelism.n) or 1)
if mode == tf.estimator.ModeKeys.PREDICT:
features["infer_targets"] = features["targets"]
features["targets"] = None
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS, data_reader.DummyQueueRunner())
return features, features["targets"]
def input_fn(self,
mode,
hparams,
data_dir=None,
params=None,
config=None,
force_repeat=False,
prevent_repeat=False,
dataset_kwargs=None):
"""Builds input pipeline for problem.
Args:
mode: tf.estimator.ModeKeys
hparams: HParams, model hparams
data_dir: str, data directory; if None, will use hparams.data_dir
params: dict, may include "batch_size"
config: RunConfig; should have the data_parallelism attribute if not using
TPU
force_repeat: bool, whether to repeat the data even if not training
prevent_repeat: bool, whether to not repeat when in training mode.
Overrides force_repeat.
dataset_kwargs: dict, if passed, will pass as kwargs to self.dataset
method when called
Returns:
(features_dict<str name, Tensor feature>, Tensor targets)
"""
partition_id, num_partitions = self._dataset_partition(mode, config)
is_training = mode == tf.estimator.ModeKeys.TRAIN
if config and config.use_tpu:
num_threads = 64
else:
num_threads = cpu_count() if is_training else 1
if config and hasattr(config,
"data_parallelism") and config.data_parallelism:
num_shards = config.data_parallelism.n
else:
num_shards = 1
max_length = self.max_length(hparams)
mlperf_log.transformer_print(key=mlperf_log.INPUT_MAX_LENGTH,
value=max_length)
def tpu_valid_size(example):
return data_reader.example_valid_size(example, hparams.min_length,
max_length)
def gpu_valid_size(example):
drop_long_sequences = is_training or hparams.eval_drop_long_sequences
return data_reader.example_valid_size(
example, hparams.min_length,
max_length if drop_long_sequences else 10**9)
def define_shapes(example):
batch_size = config and config.use_tpu and params["batch_size"]
return standardize_shapes(example, batch_size=batch_size)
# Read and preprocess
data_dir = data_dir or (hasattr(hparams, "data_dir")
and hparams.data_dir)
dataset_kwargs = dataset_kwargs or {}
dataset_kwargs.update({
"mode": mode,
"data_dir": data_dir,
"num_threads": num_threads,
"hparams": hparams,
"partition_id": partition_id,
"num_partitions": num_partitions,
})
dataset = self.dataset(**dataset_kwargs)
if (force_repeat or is_training) and not prevent_repeat:
# Repeat and skip a random number of records
dataset = dataset.repeat()
if is_training and self.skip_random_fraction_when_training:
data_files = tf.contrib.slim.parallel_reader.get_data_files(
self.filepattern(data_dir, mode))
# In continuous_train_and_eval when switching between train and
# eval, this input_fn method gets called multiple times and it
# would give you the exact same samples from the last call
# (because the Graph seed is set). So this skip gives you some
# shuffling.
dataset = skip_random_fraction(dataset, data_files[0])
dataset = dataset.map(data_reader.cast_ints_to_int32,
num_parallel_calls=num_threads)
if self.batch_size_means_tokens:
batch_size_means_tokens = True
else:
if _are_shapes_fully_defined(dataset.output_shapes):
batch_size_means_tokens = False
else:
tf.logging.warning(
"Shapes are not fully defined. Assuming batch_size means tokens."
)
batch_size_means_tokens = True
# Batching
if not batch_size_means_tokens:
# Batch size means examples per datashard.
if config and config.use_tpu:
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
dataset = dataset.batch(batch_size, drop_remainder=True)
else:
batch_size = hparams.batch_size * num_shards
dataset = dataset.batch(batch_size)
else:
# batch_size means tokens per datashard
if config and config.use_tpu:
dataset = dataset.filter(tpu_valid_size)
padded_shapes = self._pad_for_tpu(dataset.output_shapes,
hparams)
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
if hparams.pad_batch:
tf.logging.warn(
"Padding the batch to ensure that remainder eval batches are "
"processed. This may lead to incorrect metrics for "
"non-zero-padded features, e.g. images. Use a smaller batch "
"size that has no remainder in that case.")
dataset = dataset.padded_batch(batch_size,
padded_shapes,
drop_remainder=False)
dataset = dataset.map(functools.partial(
pad_batch, batch_multiple=batch_size),
num_parallel_calls=num_threads)
else:
dataset = dataset.padded_batch(batch_size,
padded_shapes,
drop_remainder=True)
else:
# On GPU, bucket by length
dataset = dataset.filter(gpu_valid_size)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=num_shards,
length_multiplier=self.get_hparams().batch_size_multiplier)
if hparams.use_fixed_batch_size:
# Here batch_size really means examples per datashard.
batching_scheme["batch_sizes"] = [hparams.batch_size]
batching_scheme["boundaries"] = []
dataset = dataset.apply(
tf.contrib.data.bucket_by_sequence_length(
data_reader.example_length,
batching_scheme["boundaries"],
batching_scheme["batch_sizes"]))
if not is_training:
batch_multiple = num_shards
if hparams.use_fixed_batch_size:
# Make sure the last batch has the same fixed size as the rest.
batch_multiple *= hparams.batch_size
if batch_multiple > 1:
tf.logging.warn(
"Padding the batch to ensure that remainder eval batches have "
"a batch size divisible by the number of data shards. This may "
"lead to incorrect metrics for non-zero-padded features, e.g. "
"images. Use a single datashard (i.e. 1 GPU) in that case."
)
dataset = dataset.map(functools.partial(
pad_batch, batch_multiple=batch_multiple),
num_parallel_calls=num_threads)
dataset = dataset.map(define_shapes, num_parallel_calls=num_threads)
# Add shuffling for training batches. This is necessary along with record
# level shuffling in the dataset generation. Record shuffling will shuffle
# the examples. However, in some cases, it's possible that the shuffle
# buffer size for record shuffling is smaller than the batch size. In such
# cases, adding batch shuffling ensures that the data is in random order
# during training
if (is_training and hasattr(hparams, "batch_shuffle_size")
and hparams.batch_shuffle_size):
dataset = dataset.shuffle(hparams.batch_shuffle_size)
def prepare_for_output(example):
if not config or not config.use_tpu:
_summarize_features(example, num_shards)
if mode == tf.estimator.ModeKeys.PREDICT:
example["infer_targets"] = example.pop("targets")
return example
else:
return example, example["targets"]
dataset = dataset.map(prepare_for_output,
num_parallel_calls=num_threads)
dataset = dataset.prefetch(2)
if mode == tf.estimator.ModeKeys.PREDICT:
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS,
data_reader.DummyQueueRunner())
return dataset
def input_fn():
"""Supplies input to our model.
This function supplies input to our model, where this input is a
function of the mode. For example, we supply different data if
we're performing training versus evaluation.
Returns:
A tuple consisting of 1) a dictionary of tensors whose keys are
the feature names, and 2) a tensor of target labels if the mode
is not INFER (and None, otherwise).
Raises:
ValueError: if one of the parameters has an unsupported value.
"""
problem_count, batches = len(hparams.problems), []
with tf.name_scope("input_reader"):
for n in xrange(problem_count):
if fixed_problem is not None and n != fixed_problem:
continue
problem_instance = hparams.problem_instances[n]
p_hparams = hparams.problems[n]
with tf.name_scope("problem_%d" % n):
with tf.device("/cpu:0"): # Input reading on CPU
capacity = (
p_hparams.max_expected_batch_size_per_shard *
num_datashards)
feature_map = data_reader.input_pipeline(
problem_instance, data_file_patterns
and data_file_patterns[n], capacity, mode, hparams,
data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=num_datashards,
drop_long_sequences=(
mode == tf.estimator.ModeKeys.TRAIN
or hparams.eval_drop_long_sequences),
length_multiplier=(
p_hparams.batch_size_multiplier)))
# Reverse inputs and targets features if the problem was reversed.
if problem_instance is not None:
problem_instance.maybe_reverse_features(feature_map)
problem_instance.maybe_copy_features(feature_map)
else:
if p_hparams.was_reversed:
inputs = feature_map["inputs"]
targets = feature_map["targets"]
feature_map["inputs"] = targets
feature_map["targets"] = inputs
# Use the inputs as the targets if the problem is a copy problem.
if p_hparams.was_copy:
feature_map["targets"] = feature_map["inputs"]
# Ensure inputs and targets are proper rank.
while len(feature_map["inputs"].get_shape()) != 4:
feature_map["inputs"] = tf.expand_dims(
feature_map["inputs"], axis=-1)
while len(feature_map["targets"].get_shape()) != 4:
feature_map["targets"] = tf.expand_dims(
feature_map["targets"], axis=-1)
batches.append(
(feature_map["inputs"], feature_map["targets"],
tf.constant(n), tf.constant(p_hparams.input_space_id),
tf.constant(p_hparams.target_space_id)))
# We choose which problem to process.
loss_moving_avgs = [] # Need loss moving averages for that.
for n in xrange(problem_count):
with tf.variable_scope("losses_avg"):
loss_moving_avgs.append(
tf.get_variable("problem_%d/total_loss" % n,
initializer=100.0,
trainable=False))
if fixed_problem is None:
if (hparams.problem_choice == "uniform"
or mode != tf.estimator.ModeKeys.TRAIN):
problem_choice = tf.random_uniform([],
maxval=problem_count,
dtype=tf.int32)
elif hparams.problem_choice == "adaptive":
loss_moving_avgs = tf.stack(loss_moving_avgs)
problem_choice = tf.multinomial(
tf.reshape(loss_moving_avgs, [1, -1]), 1)
problem_choice = tf.to_int32(tf.squeeze(problem_choice))
elif hparams.problem_choice == "distributed":
assert worker_replicas >= problem_count
assert worker_replicas % problem_count == 0
problem_choice = tf.to_int32(worker_id % problem_count)
else:
raise ValueError(
"Value of hparams.problem_choice is %s and must be "
"one of [uniform, adaptive, distributed]" %
hparams.problem_choice)
# Inputs and targets conditional on problem_choice.
rand_inputs, rand_target, choice, inp_id, tgt_id = cond_on_index(
lambda n: batches[n], problem_choice, 0, problem_count - 1)
else:
problem_choice = tf.constant(fixed_problem)
# Take the only constructed batch, which is the fixed_problem.
rand_inputs, rand_target, choice, inp_id, tgt_id = batches[0]
# Set shapes so the ranks are clear.
rand_inputs.set_shape([None, None, None, None])
rand_target.set_shape([None, None, None, None])
choice.set_shape([])
inp_id.set_shape([])
tgt_id.set_shape([])
# Forced shape obfuscation is necessary for inference.
if mode == tf.estimator.ModeKeys.PREDICT:
rand_inputs._shape = tf.TensorShape([None, None, None, None]) # pylint: disable=protected-access
rand_target._shape = tf.TensorShape([None, None, None, None]) # pylint: disable=protected-access
# Final feature map.
rand_feature_map = {
"inputs": rand_inputs,
"problem_choice": choice,
"input_space_id": inp_id,
"target_space_id": tgt_id
}
if mode == tf.estimator.ModeKeys.PREDICT:
rand_feature_map["infer_targets"] = rand_target
rand_target = None
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS,
DummyQueueRunner())
return rand_feature_map, rand_target
def input_fn(self,
mode,
hparams,
data_dir=None,
params=None,
config=None,
dataset_kwargs=None):
"""Builds input pipeline for problem.
Args:
mode: tf.estimator.ModeKeys
hparams: HParams, model hparams
data_dir: str, data directory; if None, will use hparams.data_dir
params: dict, may include "batch_size"
config: RunConfig; should have the data_parallelism attribute if not using
TPU
dataset_kwargs: dict, if passed, will pass as kwargs to self.dataset
method when called
Returns:
(features_dict<str name, Tensor feature>, Tensor targets)
"""
is_training = mode == tf.estimator.ModeKeys.TRAIN
num_threads = 4 if is_training else 1
def tpu_valid_size(example):
return data_reader.example_valid_size(example, hparams.min_length,
hparams.max_length)
def gpu_valid_size(example):
drop_long_sequences = is_training or hparams.eval_drop_long_sequences
return data_reader.example_valid_size(
example, hparams.min_length,
hparams.max_length if drop_long_sequences else 10**9)
def define_shapes(example):
batch_size = config and config.use_tpu and params["batch_size"]
return standardize_shapes(example, batch_size=batch_size)
# Read and preprocess
data_dir = data_dir or hparams.data_dir
dataset_kwargs = dataset_kwargs or {}
dataset_kwargs.update({
"mode": mode,
"data_dir": data_dir,
"num_threads": num_threads,
"hparams": hparams
})
dataset = self.dataset(**dataset_kwargs)
dataset = dataset.map(data_reader.cast_int64_to_int32,
num_parallel_calls=num_threads)
if is_training:
dataset = dataset.repeat(None)
# Batching
if _are_shapes_fully_defined(dataset.output_shapes):
# Static shape features (e.g. images)
if config and config.use_tpu:
tpu_batch_size = params["batch_size"]
dataset = dataset.apply(
tf.contrib.data.batch_and_drop_remainder(tpu_batch_size))
else:
num_shards = (config and config.data_parallelism.n) or 1
dataset = dataset.batch(hparams.batch_size * num_shards)
else:
# Variable length features
if config and config.use_tpu:
# On TPU, pad to hparams.max_length
dataset = dataset.filter(tpu_valid_size)
padded_shapes = _fill_shape_nones(
dataset.output_shapes, none_filler=hparams.max_length)
dataset = dataset.apply(
tf.contrib.data.padded_batch_and_drop_remainder(
params["batch_size"], padded_shapes))
else:
# On GPU, bucket by length
dataset = dataset.filter(gpu_valid_size)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=(config and config.data_parallelism.n)
or 1,
length_multiplier=self.get_hparams().batch_size_multiplier)
if hparams.use_fixed_batch_size:
batching_scheme["batch_sizes"] = [hparams.batch_size]
batching_scheme["boundaries"] = []
dataset = data_reader.bucket_by_sequence_length(
dataset, data_reader.example_length,
batching_scheme["boundaries"],
batching_scheme["batch_sizes"])
dataset = dataset.map(define_shapes, num_parallel_calls=num_threads)
dataset = dataset.prefetch(1)
features = dataset.make_one_shot_iterator().get_next()
if not config or not config.use_tpu:
_summarize_features(features,
(config and config.data_parallelism.n) or 1)
if mode == tf.estimator.ModeKeys.PREDICT:
features["infer_targets"] = features["targets"]
features["targets"] = None
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS,
data_reader.DummyQueueRunner())
return features, features["targets"]
def input_fn(self,
mode,
hparams,
data_dir=None,
params=None,
config=None,
dataset_kwargs=None):
"""Builds input pipeline for problem.
Args:
mode: tf.estimator.ModeKeys
hparams: HParams, model hparams
data_dir: str, data directory; if None, will use hparams.data_dir
params: dict, may include "batch_size"
config: RunConfig; should have the data_parallelism attribute if not using
TPU
dataset_kwargs: dict, if passed, will pass as kwargs to self.dataset
method when called
Returns:
(features_dict<str name, Tensor feature>, Tensor targets)
"""
partition_id, num_partitions = self._dataset_partition(mode, config)
is_training = mode == tf.estimator.ModeKeys.TRAIN
if config and config.use_tpu:
num_threads = 64
else:
num_threads = 4 if is_training else 1
max_length = self.max_length(hparams)
def tpu_valid_size(example):
return data_reader.example_valid_size(example, hparams.min_length,
max_length)
def gpu_valid_size(example):
drop_long_sequences = is_training or hparams.eval_drop_long_sequences
return data_reader.example_valid_size(example, hparams.min_length,
max_length
if drop_long_sequences else 10**9)
def define_shapes(example):
batch_size = config and config.use_tpu and params["batch_size"]
return standardize_shapes(example, batch_size=batch_size)
# Read and preprocess
data_dir = data_dir or (hasattr(hparams, "data_dir") and hparams.data_dir)
dataset_kwargs = dataset_kwargs or {}
dataset_kwargs.update({
"mode": mode,
"data_dir": data_dir,
"num_threads": num_threads,
"hparams": hparams,
"partition_id": partition_id,
"num_partitions": num_partitions,
})
dataset = self.dataset(**dataset_kwargs)
if is_training:
# Repeat and skip a random number of records
dataset = dataset.repeat()
data_files = tf.contrib.slim.parallel_reader.get_data_files(
self.filepattern(data_dir, mode))
# In continuous_train_and_eval when switching between train and
# eval, this input_fn method gets called multiple times and it
# would give you the exact same samples from the last call
# (because the Graph seed is set). So this skip gives you some
# shuffling.
dataset = skip_random_fraction(dataset, data_files[0])
dataset = dataset.map(
data_reader.cast_ints_to_int32, num_parallel_calls=num_threads)
if self.batch_size_means_tokens:
batch_size_means_tokens = True
else:
if _are_shapes_fully_defined(dataset.output_shapes):
batch_size_means_tokens = False
else:
tf.logging.warning(
"Shapes are not fully defined. Assuming batch_size means tokens.")
batch_size_means_tokens = True
# Batching
if not batch_size_means_tokens:
# Batch size means examples per datashard.
if config and config.use_tpu:
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
dataset = dataset.batch(batch_size, drop_remainder=True)
else:
num_shards = config.data_parallelism.n if config else 1
batch_size = hparams.batch_size * num_shards
dataset = dataset.batch(batch_size)
else:
# batch_size means tokens per datashard
if config and config.use_tpu:
dataset = dataset.filter(tpu_valid_size)
padded_shapes = self._pad_for_tpu(dataset.output_shapes, hparams)
# on TPU, we use params["batch_size"], which specifies the number of
# examples across all datashards
batch_size = params["batch_size"]
dataset = dataset.apply(
tf.contrib.data.padded_batch_and_drop_remainder(
batch_size, padded_shapes))
else:
# On GPU, bucket by length
dataset = dataset.filter(gpu_valid_size)
shard_multiplier = config.data_parallelism.n if config else 1
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=shard_multiplier,
length_multiplier=self.get_hparams().batch_size_multiplier)
if hparams.use_fixed_batch_size:
# Here batch_size really means examples per datashard.
batching_scheme["batch_sizes"] = [hparams.batch_size]
batching_scheme["boundaries"] = []
dataset = data_reader.bucket_by_sequence_length(
dataset, data_reader.example_length, batching_scheme["boundaries"],
batching_scheme["batch_sizes"])
if not is_training:
batch_multiple = shard_multiplier
if hparams.use_fixed_batch_size:
# Make sure the last batch has the same fixed size as the rest.
batch_multiple *= hparams.batch_size
if batch_multiple > 1:
tf.logging.warn(
"Padding the batch to ensure that remainder eval batches have "
"a batch size divisible by the number of data shards. This may "
"lead to incorrect metrics for non-zero-padded features, e.g. "
"images. Use a single datashard (i.e. 1 GPU) in that case.")
dataset = dataset.map(
functools.partial(pad_batch, batch_multiple=batch_multiple),
num_parallel_calls=num_threads)
dataset = dataset.map(define_shapes, num_parallel_calls=num_threads)
def prepare_for_output(example):
if not config or not config.use_tpu:
_summarize_features(example,
(config and config.data_parallelism.n) or 1)
if mode == tf.estimator.ModeKeys.PREDICT:
example["infer_targets"] = example.pop("targets")
return example
else:
return example, example["targets"]
dataset = dataset.map(prepare_for_output, num_parallel_calls=num_threads)
dataset = dataset.prefetch(2)
if mode == tf.estimator.ModeKeys.PREDICT:
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS,
data_reader.DummyQueueRunner())
return dataset
def input_fn(self, mode, hparams, data_dir=None, params=None, config=None,
dataset_kwargs=None):
"""Builds input pipeline for problem.
Args:
mode: tf.estimator.ModeKeys
hparams: HParams, model hparams
data_dir: str, data directory; if None, will use hparams.data_dir
params: dict, may include "batch_size"
config: RunConfig; should have the data_parallelism attribute if not using
TPU
dataset_kwargs: dict, if passed, will pass as kwargs to self.dataset
method when called
Returns:
(features_dict<str name, Tensor feature>, Tensor targets)
"""
is_training = mode == tf.estimator.ModeKeys.TRAIN
num_threads = 4 if is_training else 1
def tpu_valid_size(example):
return data_reader.example_valid_size(example, hparams.min_length,
hparams.max_length)
def gpu_valid_size(example):
drop_long_sequences = is_training or hparams.eval_drop_long_sequences
return data_reader.example_valid_size(
example,
hparams.min_length,
hparams.max_length if drop_long_sequences else 10**9)
def define_shapes(example):
batch_size = config and config.use_tpu and params["batch_size"]
return standardize_shapes(example, batch_size=batch_size)
# Read and preprocess
data_dir = data_dir or hparams.data_dir
dataset_kwargs = dataset_kwargs or {}
dataset_kwargs.update({
"mode": mode,
"data_dir": data_dir,
"num_threads": num_threads,
"hparams": hparams})
dataset = self.dataset(**dataset_kwargs)
dataset = dataset.map(
data_reader.cast_int64_to_int32, num_parallel_calls=num_threads)
if is_training:
dataset = dataset.repeat(None)
# Batching
if _are_shapes_fully_defined(dataset.output_shapes):
# Static shape features (e.g. images)
if config and config.use_tpu:
tpu_batch_size = params["batch_size"]
dataset = dataset.apply(
tf.contrib.data.batch_and_drop_remainder(tpu_batch_size))
else:
num_shards = (config and config.data_parallelism.n) or 1
dataset = dataset.batch(hparams.batch_size * num_shards)
else:
# Variable length features
if config and config.use_tpu:
# On TPU, pad to hparams.max_length
dataset = dataset.filter(tpu_valid_size)
padded_shapes = _fill_shape_nones(
dataset.output_shapes, none_filler=hparams.max_length)
dataset = dataset.apply(
tf.contrib.data.padded_batch_and_drop_remainder(
params["batch_size"], padded_shapes))
else:
# On GPU, bucket by length
dataset = dataset.filter(gpu_valid_size)
batching_scheme = data_reader.hparams_to_batching_scheme(
hparams,
shard_multiplier=(config and config.data_parallelism.n) or 1,
length_multiplier=self.get_hparams().batch_size_multiplier)
if hparams.use_fixed_batch_size:
batching_scheme["batch_sizes"] = [hparams.batch_size]
batching_scheme["boundaries"] = []
dataset = data_reader.bucket_by_sequence_length(
dataset,
data_reader.example_length,
batching_scheme["boundaries"],
batching_scheme["batch_sizes"])
if not is_training:
def _pad_batch(features):
if not config or config.data_parallelism.n <= 1:
return features
tf.logging.warn(
"Padding the batch to ensure that remainder eval batches have "
"a batch size divisible by the number of data shards. This may "
"lead to incorrect metrics for non-zero-padded features, e.g. "
"images. Use a single datashard (i.e. 1 GPU) in that case.")
return pad_batch(features, config.data_parallelism.n)
dataset = dataset.map(_pad_batch, num_parallel_calls=num_threads)
dataset = dataset.map(define_shapes, num_parallel_calls=num_threads)
dataset = dataset.prefetch(1)
features = dataset.make_one_shot_iterator().get_next()
if not config or not config.use_tpu:
_summarize_features(features, (config and config.data_parallelism.n) or 1)
if mode == tf.estimator.ModeKeys.PREDICT:
features["infer_targets"] = features["targets"]
features["targets"] = None
# This is because of a bug in the Estimator that short-circuits prediction
# if it doesn't see a QueueRunner. DummyQueueRunner implements the
# minimal expected interface but does nothing.
tf.add_to_collection(tf.GraphKeys.QUEUE_RUNNERS,
data_reader.DummyQueueRunner())
return features, features["targets"]
