def _compute_is_bus_day_table(self):
"""Computes and caches "is business day" table."""
if self._table_cache.is_bus_day is not None:
return self._table_cache.is_bus_day
with tf.init_scope():
ordinals = tf.range(self._ordinal_offset,
self._ordinal_offset + self._calendar_size)
# Apply weekend mask
week_days = (ordinals - 1) % 7
is_holiday = tf.gather(self._weekend_mask, week_days)
# Apply holidays
if self._holidays is not None:
indices = self._holidays.ordinal() - self._ordinal_offset
ones_at_indices = tf.scatter_nd(
tf.expand_dims(indices, axis=-1), tf.ones_like(indices),
is_holiday.shape)
is_holiday = tf.bitwise.bitwise_or(is_holiday, ones_at_indices)
# Add a business day at the beginning and at the end, i.e. at 31 Dec of
# start_year-1 and at 1 Jan of end_year+1. This trick is to avoid dealing
# with special cases on boundaries.
# For example, for Following and Preceding conventions we'd need a special
# value that means "unknown" in the tables. More complicated conventions
# then combine the Following and Preceding tables, and would need special
# treatment of the "unknown" values.
# With these "fake" business days, all computations are automatically
# correct, unless we land on those extra days - for this reason we add
# assertions in all API calls before returning.
is_bus_day_table = tf.concat([[1], 1 - is_holiday, [1]], axis=0)
self._table_cache.is_bus_day = is_bus_day_table
return is_bus_day_table
def apply_gradients(self, grads_and_vars):
"""Apply gradients to variables.
Args:
grads_and_vars: List of (gradient, variable) pairs.
Returns:
None
Raises:
TypeError: If `grads_and_vars` is malformed.
"""
if isinstance(self._learning_rate,
learning_rate_schedule.LearningRateSchedule):
# Compute the current learning rate at the beginning of variable update.
self._current_learning_rate.assign(self._learning_rate(self.iterations))
grads_and_vars = optimizer_utils.filter_empty_gradients(grads_and_vars)
grads, trainable_variables = zip(*grads_and_vars)
scope_name = self._name or "optimizer"
with tf.name_scope(scope_name):
with tf.init_scope():
# Lift variable creation to init scope to avoid environment issues.
self.build(trainable_variables)
grads = self._clip_gradients(grads)
grads_and_vars = list(zip(grads, trainable_variables))
self._internal_apply_gradients(grads_and_vars)
def __init__(self,
name,
clipnorm=None,
clipvalue=None,
global_clipnorm=None):
"""Create a new Optimizer.
Args:
name: String. The name to use for momentum accumulator weights created by
the optimizer.
clipnorm: float. If set, the gradient of each weight is individually
clipped so that its norm is no higher than this value.
clipvalue: float. If set, the gradient of each weight is clipped to be
no higher than this value.
global_clipnorm: float. If set, the gradient of all weights is clipped
so that their global norm is no higher than this value.
"""
self._name = name
self._clipnorm = clipnorm
self._global_clipnorm = global_clipnorm
if self._clipnorm is not None and self._global_clipnorm is not None:
raise ValueError(
f"At most one of `clipnorm` and `global_clipnorm` can "
f"be set. Received: clipnorm={self._clipnorm}, "
f"global_clipnorm={self._global_clipnorm}.")
self._clipvalue = clipvalue
with tf.init_scope():
# Lift the variable creation to init scope to avoid environment issue.
self._iterations = tf.Variable(0, name="iteration", dtype=tf.int64)
def _compute_rolled_dates_table(self, roll_convention):
"""Computes and caches rolled dates table."""
already_computed = self._table_cache.rolled_dates.get(
roll_convention, None)
if already_computed is not None:
return already_computed
roll_convention_np = _to_np_roll_convention(roll_convention)
holidays_arg = self._holidays_np
if holidays_arg is None:
holidays_arg = [] # np.busday_offset doesn't accept None
adjusted_np = np.busday_offset(dates=self._dates_np,
offsets=0,
roll=roll_convention_np,
weekmask=1 - self._weekend_mask,
holidays=holidays_arg)
rolled_date_table = adjusted_np.astype(np.int32) + _ORDINAL_OF_1_1_1970
# To make tensor caching safe, lift the ops out of the current scope using
# tf.init_scope(). This allows e.g. to cache these tensors in one
# tf.function and reuse them in another tf.function.
with tf.init_scope():
rolled_date_table = tf.convert_to_tensor(rolled_date_table,
name="rolled_date_table")
self._table_cache.rolled_dates[roll_convention] = rolled_date_table
return rolled_date_table
def load_dataset():
"""Function that actually loads the dataset."""
if load_dataset.dataset is not None:
return load_dataset.dataset
with tf.name_scope('german_credit_numeric'), tf.init_scope():
dataset = _tfds().load('german_credit_numeric:1.*.*')
features = []
labels = []
for entry in _tfds().as_numpy(dataset)['train']:
features.append(entry['features'])
# We're reversing the labels to match what's in the original dataset,
# rather the TFDS encoding.
labels.append(1 - entry['label'])
features = np.stack(features, axis=0)
labels = np.stack(labels, axis=0)
train_features = features[:num_train]
test_features = features[num_train:]
if normalize_fn is not None:
train_features, test_features = normalize_fn(
train_features, test_features)
load_dataset.dataset = dict(
train_features=train_features,
train_labels=labels[:num_train].astype(np.int32),
test_features=test_features,
test_labels=labels[num_train:].astype(np.int32),
)
return load_dataset.dataset
def _create_iteration_variable(self):
"""Create the iterations counter variable."""
with tf.init_scope():
# Lift the variable creation to init scope to avoid environment issue.
self._iterations = tf.Variable(
0, name="iteration", dtype=tf.int64, trainable=False
)
def preprocessing_fn(inputs):
"""Preprocess input columns into transformed columns."""
# Since we are modifying some features and leaving others unchanged, we
# start by setting `outputs` to a copy of `inputs.
outputs = inputs.copy()
# Scale numeric columns to have range [0, 1].
for key in NUMERIC_FEATURE_KEYS:
outputs[key] = tft.scale_to_0_1(inputs[key])
for key in OPTIONAL_NUMERIC_FEATURE_KEYS:
# This is a SparseTensor because it is optional. Here we fill in a default
# value when it is missing.
sparse = tf.sparse.SparseTensor(inputs[key].indices,
inputs[key].values,
[inputs[key].dense_shape[0], 1])
dense = tf.sparse.to_dense(sp_input=sparse, default_value=0.)
# Reshaping from a batch of vectors of size 1 to a batch to scalars.
dense = tf.squeeze(dense, axis=1)
outputs[key] = tft.scale_to_0_1(dense)
# For all categorical columns except the label column, we generate a
# vocabulary, and convert the string feature to a one-hot encoding.
for key in CATEGORICAL_FEATURE_KEYS:
integerized = tft.compute_and_apply_vocabulary(
tf.strings.strip(inputs[key]),
num_oov_buckets=NUM_OOV_BUCKETS,
vocab_filename=key)
depth = (tft.experimental.get_vocabulary_size_by_name(key) +
NUM_OOV_BUCKETS)
one_hot_encoded = tf.one_hot(integerized,
depth=tf.cast(depth, tf.int32),
on_value=1.0,
off_value=0.0)
# This output is now one-hot encoded. If saving transformed data to disk,
# this can incur significant memory cost.
outputs[key] = tf.reshape(one_hot_encoded, [-1, depth])
# For the label column we provide the mapping from string to index.
table_keys = ['>50K', '<=50K']
with tf.init_scope():
initializer = tf.lookup.KeyValueTensorInitializer(
keys=table_keys,
values=tf.cast(tf.range(len(table_keys)), tf.int64),
key_dtype=tf.string,
value_dtype=tf.int64)
table = tf.lookup.StaticHashTable(initializer, default_value=-1)
# Remove trailing periods for test data when the data is read with tf.data.
label_str = tf.strings.regex_replace(inputs[LABEL_KEY], r'\.', '')
label_str = tf.strings.strip(label_str)
data_labels = table.lookup(label_str)
transformed_label = tf.one_hot(indices=data_labels,
depth=len(table_keys),
on_value=1.0,
off_value=0.0)
outputs[LABEL_KEY] = tf.reshape(transformed_label,
[-1, len(table_keys)])
return outputs
def _create_iteration_variable(self):
init_val = tf.constant(0, dtype=tf.int64)
if self._mesh:
init_val = dtensor.copy_to_mesh(
init_val, dtensor.Layout.replicated(self._mesh, rank=0))
with tf.init_scope():
# Lift the variable creation to init scope to avoid environment issue.
self._iterations = dtensor.DVariable(init_val, name='iteration')
def _lookup_table_from_tokens(self, tokens):
with tf.init_scope():
token_start = self._token_start_index()
token_end = token_start + tf.size(tokens)
indices = tf.range(token_start, token_end, dtype=tf.int64)
keys, values = (indices, tokens) if self.invert else (tokens,
indices)
initializer = tf.lookup.KeyValueTensorInitializer(
keys, values, self._key_dtype, self._value_dtype)
return tf.lookup.StaticHashTable(initializer, self._default_value)
def _compute_cumul_bus_days_table(self):
"""Computes and caches cumulative business days table."""
if self._table_cache.cumul_bus_days is not None:
return self._table_cache.cumul_bus_days
is_bus_day_table = self._compute_is_bus_day_table()
with tf.init_scope():
cumul_bus_days_table = tf.math.cumsum(is_bus_day_table, exclusive=True,
name="cumul_bus_days_table")
self._table_cache.cumul_bus_days = cumul_bus_days_table
return cumul_bus_days_table
def _compute_bus_day_ordinals_table(self):
"""Computes and caches rolled business day ordinals table."""
if self._table_cache.bus_day_ordinals is not None:
return self._table_cache.bus_day_ordinals
is_bus_day_table = self._compute_is_bus_day_table()
with tf.init_scope():
bus_day_ordinals_table = (
tf.cast(tf.where(is_bus_day_table)[:, 0], tf.int32) +
self._ordinal_offset - 1)
self._table_cache.bus_day_ordinals = bus_day_ordinals_table
return bus_day_ordinals_table
def _build(self, shape):
self._shape = tf.TensorShape(shape)
self._build_input_shape = self._shape
# Create new state variables
self._total = self.add_weight(
name='total', shape=shape, initializer='zeros')
self._count = self.add_weight(
name='count', shape=shape, initializer='zeros')
with tf.init_scope():
if not tf.executing_eagerly():
backend._initialize_variables(backend._get_session()) # pylint: disable=protected-access
self._built = True
def patched_call(self, shape, dtype):
"""Monkey-patched verison of `Initializer.__call__`."""
cls = type(self)
orig_call = all_initializers[cls]
try:
with tf.init_scope():
return orig_call(self, shape, dtype)
except: # pylint: disable=bare-except
if not tf.executing_eagerly():
logging.exception(
"Failed to create initial value eagerly for %s shape=%s dtype=%s",
type(self).__name__, shape, dtype)
return orig_call(self, shape, dtype)
def _compute_rolled_dates_table(self, convention):
"""Computes and caches rolled dates table."""
already_computed = self._table_cache.rolled_dates.get(convention, None)
if already_computed is not None:
return already_computed
# To make tensor caching safe, lift the ops out of the current scope using
# tf.init_scope(). This allows e.g. to cache these tensors in one
# tf.function and reuse them in another tf.function.
with tf.init_scope():
rolled_date_table = (
self._compute_rolled_dates_table_without_cache(convention))
self._table_cache.rolled_dates[convention] = rolled_date_table
return rolled_date_table
def _build(self, shape):
self._shape = tf.TensorShape(shape)
self._build_input_shape = self._shape
# Create new state variables
self._total = self.add_weight(
name="total", shape=shape, initializer="zeros"
)
self._count = self.add_weight(
name="count", shape=shape, initializer="zeros"
)
with tf.init_scope():
if not tf.executing_eagerly():
backend._initialize_variables(backend._get_session())
self._built = True
def _eager_variable_creator(getter, initial_value, **kwargs):
"""Attempts to force variable creation to be eager."""
eager_initial_value = None
if isinstance(initial_value, tf.Tensor):
eager_initial_value = tf.get_static_value(initial_value)
if eager_initial_value is not None:
# If we have an eager initial value we can create variables in eager mode.
with tf.init_scope():
return getter(initial_value=eager_initial_value, **kwargs)
else:
# Fall back to creating in whatever context we're in with user input.
return getter(initial_value=initial_value, **kwargs)
def _lookup_table_from_file(self, filename):
if self.invert:
key_index = tf.lookup.TextFileIndex.LINE_NUMBER
value_index = tf.lookup.TextFileIndex.WHOLE_LINE
else:
key_index = tf.lookup.TextFileIndex.WHOLE_LINE
value_index = tf.lookup.TextFileIndex.LINE_NUMBER
with tf.init_scope():
initializer = tf.lookup.TextFileInitializer(
filename=filename,
key_dtype=self._key_dtype,
key_index=key_index,
value_dtype=self._value_dtype,
value_index=value_index,
value_index_offset=self._token_start_index())
return tf.lookup.StaticHashTable(initializer, self._default_value)
def maybe_init_scope(layer):
"""Open an `init_scope` if in V2 mode and using the keras graph.
Args:
layer: The Layer/Model that is currently active.
Yields:
None
"""
# Don't open an init_scope in V1 mode or when using legacy tf.layers.
if (tf.compat.v1.executing_eagerly_outside_functions()
and getattr(layer, '_keras_style', True)):
with tf.init_scope():
yield
else:
yield
def _maybe_freeze_vocab_size(self):
if self.output_mode == INT or self.pad_to_max_tokens:
return
with tf.init_scope():
new_vocab_size = self.vocabulary_size()
if new_vocab_size == self._token_start_index():
raise RuntimeError(
"When using `output_mode={}` and `pad_to_max_tokens=False`, you "
"must set the layer's vocabulary before calling it. Either pass "
"a `vocabulary` argument to the layer, or call `adapt` with some "
"sample data.".format(self.output_mode))
elif (self._frozen_vocab_size is not None
and new_vocab_size != self._frozen_vocab_size):
raise RuntimeError(
"When using `output_mode={}` and `pad_to_max_tokens=False`, the "
"vocabulary size cannot be changed after the layer is called. "
"Vocab size is {}, new vocab size is {}".format(
self.output_mode, self._frozen_vocab_size, new_vocab_size))
self._frozen_vocab_size = new_vocab_size
def _set_state_variables(self, updates):
"""Directly update the internal state of this Layer.
This method expects a string-keyed dict of {state_variable_name: state}. The
precise nature of the state, and the names associated, are describe by
the subclasses of CombinerPreprocessingLayer.
Args:
updates: A string keyed dict of weights to update.
Raises:
RuntimeError: if 'build()' was not called before 'set_processing_state'.
"""
# TODO(momernick): Do we need to do any more input sanitization?
if not self.built:
raise RuntimeError('_set_state_variables() must be called after build().')
with tf.init_scope():
for var_name, value in updates.items():
self.state_variables[var_name].assign(value)
def add_weight(
self,
name,
shape=(),
aggregation=tf.VariableAggregation.SUM,
synchronization=tf.VariableSynchronization.ON_READ,
initializer=None,
dtype=None,
):
"""Adds state variable. Only for use by subclasses."""
if tf.distribute.has_strategy():
strategy = tf.distribute.get_strategy()
else:
strategy = None
# TODO(b/120571621): Make `ON_READ` work with Keras metrics on TPU.
if backend.is_tpu_strategy(strategy):
synchronization = tf.VariableSynchronization.ON_WRITE
if getattr(self, "_mesh", None) is not None:
# When self._mesh is set, it means this metric is used for DTensor.
additional_kwargs = {
"layout":
dtensor.Layout.replicated(self._mesh,
tf.TensorShape(shape).rank)
}
else:
additional_kwargs = {}
with tf.init_scope():
return super().add_weight(
name=name,
shape=shape,
dtype=self._dtype if dtype is None else dtype,
trainable=False,
initializer=initializer,
collections=[],
synchronization=synchronization,
aggregation=aggregation,
**additional_kwargs,
)
def apply_gradients(self, grads_and_vars):
"""Apply gradients to variables.
Args:
grads_and_vars: List of (gradient, variable) pairs.
Returns:
None
Raises:
TypeError: If `grads_and_vars` is malformed.
"""
grads_and_vars = optimizer_utils.filter_empty_gradients(grads_and_vars)
grads, trainable_variables = zip(*grads_and_vars)
scope_name = self._name or "optimizer"
with tf.name_scope(scope_name):
with tf.init_scope():
# Lift variable creation to init scope to avoid enviroment issues.
self.build(trainable_variables)
grads = self._clip_gradients(grads)
grads_and_vars = list(zip(grads, trainable_variables))
self._internal_apply_gradients(grads_and_vars)
def _maybe_freeze_vocab_size(self):
if self.output_mode == INT or self.pad_to_max_tokens:
return
with tf.init_scope():
if not tf.executing_eagerly():
raise RuntimeError(
"When using `output_mode={}` eager execution must "
"be enabled.".format(self.output_mode))
new_vocab_size = self.vocabulary_size()
if new_vocab_size == self._token_start_index():
raise RuntimeError(
"When using `output_mode={}` and `pad_to_max_tokens=False`, "
"you must set the layer's vocabulary before calling it. Either "
"pass a `vocabulary` argument to the layer, or call `adapt` "
"with some sample data.".format(self.output_mode))
elif (self._frozen_vocab_size is not None
and new_vocab_size != self._frozen_vocab_size):
raise RuntimeError(
"When using `output_mode={}` and `pad_to_max_tokens=False`, "
"the vocabulary size cannot be changed after the layer is "
"called. Vocab size is {}, new vocab size is {}".format(
self.output_mode, self._frozen_vocab_size, new_vocab_size))
self._frozen_vocab_size = new_vocab_size
def _compute_is_bus_day_table(self):
"""Computes and caches "is business day" table."""
if self._table_cache.is_bus_day is not None:
return self._table_cache.is_bus_day
is_bus_day_table = np.ones_like(self._dates_np, dtype=np.int32)
ordinals = np.arange(self._ordinal_offset,
self._ordinal_offset + len(is_bus_day_table))
# Apply week mask
week_days = (ordinals - 1) % 7
is_bus_day_table[self._weekend_mask[week_days] == 1] = 0
# Apply holidays
if self._holidays_np is not None:
holiday_ordinals = (np.array(self._holidays_np, dtype=np.int32) +
_ORDINAL_OF_1_1_1970)
is_bus_day_table[holiday_ordinals - self._ordinal_offset] = 0
with tf.init_scope():
is_bus_day_table = tf.convert_to_tensor(is_bus_day_table,
name="is_bus_day_table")
self._table_cache.is_bus_day = is_bus_day_table
return is_bus_day_table
def __init__(self,
name,
gradients_clip_option=None,
ema_option=None,
jit_compile=False,
**kwargs):
"""Create a new Optimizer.
Args:
name: String. The name to use for momentum accumulator weights created by
the optimizer.
gradients_clip_option: an instance of
`optimizer_experimental.GradientsClipOption`, for attributes related to
gradients clipping, such as clipnorm and clipvalue. Default to None
(not applying gradients clipping).
ema_option: an instance of `optimizer_experimental.EMAOption`, for
attributes related to exponenatial moving average, such as use_ema (a
boolean field indicates if EMA is used) and EMA momentum. Default to
None (not applying EMA).
jit_compile: Bool, default to False. If True, the optimizer will use XLA
acceleration. `jit_compile` can only be False when using Parameter
Server Strategy.
**kwargs: keyword arguments only used for backward compatibility with
`optimizer_v2.OptimizerV2`. Any new code using
`optimizer_experimental.Optimizer` should leave this parameter empty.
"""
self._name = name
self._gradients_clip_option = gradients_clip_option
self._ema_option = ema_option
self._jit_compile = jit_compile
with tf.init_scope():
# Lift the variable creation to init scope to avoid environment issue.
self._iterations = tf.Variable(0, name="iteration", dtype=tf.int64)
self._process_kwargs(kwargs)
def _uninitialized_lookup_table(self):
with tf.init_scope():
initializer = NullInitializer(self._key_dtype, self._value_dtype)
return tf.lookup.StaticHashTable(initializer, self._default_value)
def add_weight(self,
name,
shape,
dtype=None,
initializer=None,
regularizer=None,
trainable=None,
constraint=None,
use_resource=None,
synchronization=tf.VariableSynchronization.AUTO,
aggregation=tf.compat.v1.VariableAggregation.NONE,
partitioner=None,
**kwargs):
"""Adds a new variable to the layer, or gets an existing one; returns it.
Args:
name: variable name.
shape: variable shape.
dtype: The type of the variable. Defaults to `self.dtype` or `float32`.
initializer: initializer instance (callable).
regularizer: regularizer instance (callable).
trainable: whether the variable should be part of the layer's
"trainable_variables" (e.g. variables, biases)
or "non_trainable_variables" (e.g. BatchNorm mean, stddev).
Note, if the current variable scope is marked as non-trainable
then this parameter is ignored and any added variables are also
marked as non-trainable. `trainable` defaults to `True` unless
`synchronization` is set to `ON_READ`.
constraint: constraint instance (callable).
use_resource: Whether to use `ResourceVariable`.
synchronization: Indicates when a distributed a variable will be
aggregated. Accepted values are constants defined in the class
`tf.VariableSynchronization`. By default the synchronization is set to
`AUTO` and the current `DistributionStrategy` chooses
when to synchronize. If `synchronization` is set to `ON_READ`,
`trainable` must not be set to `True`.
aggregation: Indicates how a distributed variable will be aggregated.
Accepted values are constants defined in the class
`tf.VariableAggregation`.
partitioner: (optional) partitioner instance (callable). If
provided, when the requested variable is created it will be split
into multiple partitions according to `partitioner`. In this case,
an instance of `PartitionedVariable` is returned. Available
partitioners include `tf.compat.v1.fixed_size_partitioner` and
`tf.compat.v1.variable_axis_size_partitioner`. For more details, see
the documentation of `tf.compat.v1.get_variable` and the "Variable
Partitioners and Sharding" section of the API guide.
**kwargs: Additional keyword arguments.
Returns:
The created variable. Usually either a `Variable` or `ResourceVariable`
instance. If `partitioner` is not `None`, a `PartitionedVariable`
instance is returned.
Raises:
RuntimeError: If called with partitioned variable regularization and
eager execution is enabled.
ValueError: When trainable has been set to True with synchronization
set as `ON_READ`.
"""
for kwarg in kwargs:
if kwarg != 'experimental_autocast':
raise TypeError('Unknown keyword argument:', kwarg)
if self._keras_style:
return super(Layer, self).add_weight(
name=name,
shape=shape,
dtype=dtype,
initializer=initializer,
regularizer=regularizer,
trainable=trainable and self.trainable,
constraint=constraint,
use_resource=use_resource,
synchronization=tf.VariableSynchronization.AUTO,
aggregation=tf.compat.v1.VariableAggregation.NONE,
partitioner=partitioner,
**kwargs)
if synchronization == tf.VariableSynchronization.ON_READ:
if trainable:
raise ValueError(
'Synchronization value can be set to '
'VariableSynchronization.ON_READ only for non-trainable variables. '
'You have specified trainable=True and '
'synchronization=VariableSynchronization.ON_READ.')
else:
# Set trainable to be false when variable is to be synced on read.
trainable = False
elif trainable is None:
trainable = True
def _should_add_regularizer(variable, existing_variable_set):
if base_layer_utils.is_split_variable(variable):
for var in variable:
if var in existing_variable_set:
return False
return True
else:
return variable not in existing_variable_set
init_graph = None
if not tf.executing_eagerly():
default_graph = tf.compat.v1.get_default_graph()
if default_graph.building_function:
with tf.init_scope():
# Retrieve the variables from the graph into which variables
# will be lifted; if initialization ops will be lifted into
# the eager context, then there is nothing to retrieve, since variable
# collections are not supported when eager execution is enabled.
if not tf.executing_eagerly():
init_graph = tf.compat.v1.get_default_graph()
existing_variables = set(
tf.compat.v1.global_variables())
else:
# Initialization ops will not be lifted out of the default graph.
init_graph = default_graph
existing_variables = set(tf.compat.v1.global_variables())
if dtype is None:
dtype = self.dtype or tf.float32
self._set_scope(None)
reuse = self.built or self._reuse
prev_len_trainable = len(self._trainable_weights)
with tf.compat.v1.variable_scope(self._scope,
reuse=reuse,
auxiliary_name_scope=False) as scope:
self._current_scope = scope
with backend.name_scope(self._name_scope()):
use_resource = (use_resource or self._use_resource_variables
or scope.use_resource)
if initializer is None:
initializer = scope.initializer
variable = super(Layer, self).add_weight(
name,
shape,
dtype=tf.as_dtype(dtype),
initializer=initializer,
trainable=trainable and self.trainable,
constraint=constraint,
partitioner=partitioner,
use_resource=use_resource,
synchronization=synchronization,
aggregation=aggregation,
getter=tf.compat.v1.get_variable,
**kwargs)
if regularizer:
if (tf.compat.v1.executing_eagerly_outside_functions()
or _should_add_regularizer(variable,
existing_variables)):
self._handle_weight_regularization(
name, variable, regularizer)
if init_graph is not None:
# Handle edge case where a custom getter has overridden `trainable`.
# There is one known occurrence of this, in unit test
# testBasicRNNCellNotTrainable in
# contrib.rnn.python.kernel_tests.core_rnn_cell_test
with init_graph.as_default():
trainable_variables = tf.compat.v1.trainable_variables(
)
if (trainable and self.trainable
and variable not in trainable_variables):
# A custom getter / variable scope overrode the trainable flag.
extra_trainable_vars = self._trainable_weights[
prev_len_trainable:]
self._trainable_weights = self._trainable_weights[:
prev_len_trainable]
self._non_trainable_weights += extra_trainable_vars
return variable
def _create_keras_history_helper(tensors, processed_ops, created_layers):
"""Helper method for `create_keras_history`.
Args:
tensors: A structure of Tensors for which to create Keras metadata.
processed_ops: Set. TensorFlow operations that have already been wrapped in
`TensorFlowOpLayer` instances.
created_layers: List. The `TensorFlowOpLayer` instances created.
Returns:
Tuple. First element is the updated set of TensorFlow Operations that
have been wrapped in `TensorFlowOpLayer` instances. Second element is
a list of the `TensorFlowOpLayer` instances created.
"""
if tf.compat.v1.executing_eagerly_outside_functions():
raise ValueError(
'`create_keras_history` should only be called if eager is disabled!'
)
# Import of `base_layer` needed in order to create `TensorFlowOpLayer`.
# Cannot be imported at top because of circular dependencies.
# TODO(omalleyt): Resolve circular dependency.
from keras.engine import base_layer # pylint: disable=g-import-not-at-top
tensor_list = tf.nest.flatten(tensors)
sparse_ops = []
ragged_tensors = []
for tensor in tensor_list:
if getattr(tensor, '_keras_history', None) is not None:
continue
if isinstance(tensor,
(tf.SparseTensor, tf.compat.v1.SparseTensorValue)):
sparse_ops.append(tensor.op)
continue
if tf_utils.is_ragged(tensor):
# Ragged tensors don't have an op property
ragged_tensors.append(tensor)
continue
op = tensor.op # The Op that created this Tensor.
if op not in processed_ops:
# Recursively set `_keras_history`.
op_inputs = list(op.inputs)
constants = {}
layer_inputs = []
for i, op_input in enumerate(op_inputs):
if uses_keras_history(op_input):
layer_inputs.append(op_input)
else:
# Treat any value not originating from a `keras.Input` as
# a constant. Variables cannot be supported.
ds_with_session = (
tf.distribute.in_cross_replica_context() and
not tf.compat.v1.executing_eagerly_outside_functions())
using_xla = control_flow_util.GraphOrParentsInXlaContext(
tf.compat.v1.get_default_graph())
if ds_with_session or using_xla or _UNSAFE_GRAPH_OP_LAYER_CREATION:
# In Legacy Graph mode, evaluating here makes Session be
# configured improperly. The downside of this is that saving
# via `get_config` breaks, but SavedModel still works.
constants[i] = op_input
else:
with tf.init_scope():
constants[i] = backend.function([], op_input)([])
layer_inputs = unnest_if_single_tensor(layer_inputs)
processed_ops, created_layers = _create_keras_history_helper(
layer_inputs, processed_ops, created_layers)
name = op.name
node_def = op.node_def.SerializeToString()
op_layer = base_layer.TensorFlowOpLayer(node_def,
constants=constants,
name=name)
created_layers.append(op_layer)
op_layer._set_connectivity_metadata( # pylint: disable=protected-access
args=(layer_inputs, ),
kwargs={},
outputs=op.outputs)
processed_ops.update([op])
if sparse_ops or ragged_tensors:
lambda_example = """
weights_mult = lambda x: tf.sparse.sparse_dense_matmul(x, weights)
output = tf.keras.layers.Lambda(weights_mult)(input)
"""
raise ValueError(
'Tensorflow ops that generate ragged or sparse tensor '
'outputs are currently not supported by Keras automatic '
'op wrapping. Please wrap these ops in a Lambda layer: '
'\n\n```\n{example}\n```\n'
'Sparse ops encountered: {sparse_ops}\n'
'Ragged tensors encountered: {ragged_tensors}\n'.format(
example=lambda_example,
sparse_ops=str(sparse_ops),
ragged_tensors=str(ragged_tensors)))
return processed_ops, created_layers
def _build_graph_network_for_inferred_shape(self,
input_shape,
input_dtype=None):
if input_shape is None or not self.layers:
return
if (not tf.__internal__.tf2.enabled()
or not tf.compat.v1.executing_eagerly_outside_functions()):
# This behavior is disabled in V1 or when eager execution is
# disabled.
return
if (not self._has_explicit_input_shape
and not self._use_legacy_deferred_behavior):
# Determine whether the input shape is novel, i.e. whether the model
# should be rebuilt.
input_shape = tuple(input_shape)
if self._inferred_input_shape is None:
new_shape = input_shape
else:
new_shape = relax_input_shape(self._inferred_input_shape,
input_shape)
if (new_shape is not None
and new_shape != self._inferred_input_shape):
# A novel shape has been received: we need to rebuild the model.
# In case we are inside a graph function, we step out of it.
with tf.init_scope():
inputs = input_layer.Input(
batch_shape=new_shape,
dtype=input_dtype,
name=self.layers[0].name + "_input",
)
layer_input = inputs
created_nodes = set()
for layer in self.layers:
# Clear nodes previously created via this method. This
# prevents node accumulation and ensures that e.g.
# `layer.output` is always connected to `model.inputs`
# (this is important e.g. for the feature extraction use
# case). We don't just do `layer._inbound_nodes = []`
# in order not to break shared layers added to
# Sequential models (which is technically illegal as per
# the `add()` docstring, but wasn't previously
# disabled).
clear_previously_created_nodes(layer,
self._created_nodes)
try:
# Create Functional API connection by calling the
# current layer
layer_output = layer(layer_input)
except: # noqa: E722
# Functional API calls may fail for a number of
# reasons: 1) The layer may be buggy. In this case
# it will be easier for the user to debug if we fail
# on the first call on concrete data, instead of our
# own call on a symbolic input. 2) The layer is
# dynamic (graph-incompatible) and hasn't overridden
# `compute_output_shape`. In this case, it is
# impossible to build a graph network. 3) The layer
# is otherwise incompatible with the Functional API
# (e.g. this is the case for some probabilistic
# layers that rely on hacks and that do not return
# tensors). In all these cases, we should avoid
# creating a graph network (or we simply can't).
self._use_legacy_deferred_behavior = True
return
if len(tf.nest.flatten(layer_output)) != 1:
raise ValueError(SINGLE_LAYER_OUTPUT_ERROR_MSG)
# Keep track of nodes just created above
track_nodes_created_by_last_call(layer, created_nodes)
layer_input = layer_output
outputs = layer_output
self._created_nodes = created_nodes
try:
# Initialize a graph Network. This call will never fail
# for a stack of valid Keras layers. However some users
# have layers that are fundamentally incompatible with
# the Functional API, which do not return tensors. In
# this case, we fall back to the legacy deferred
# behavior.
# TODO(fchollet): consider raising here, as we should
# not be supporting such layers.
self._init_graph_network(inputs, outputs)
self._graph_initialized = True
except: # noqa: E722
self._use_legacy_deferred_behavior = True
self._inferred_input_shape = new_shape
def load_dataset():
"""Function that actually loads the dataset."""
if load_dataset.dataset is not None:
return load_dataset.dataset
with tf.name_scope('radon'), tf.init_scope():
dataset = _tfds().load(name='radon:1.*.*',
split='train',
batch_size=-1)
dataset = _tfds().as_numpy(dataset)
states = dataset['features']['state'].astype('U13')
floor = dataset['features']['floor'].astype(np.int32)
radon_val = dataset['activity'].astype(np.float64)
county_strings = dataset['features']['county'].astype('U13')
uranium = dataset['features']['Uppm'].astype(np.float64)
if state is not None:
floor = floor[states == state]
radon_val = radon_val[states == state]
county_strings = county_strings[states == state]
uranium = uranium[states == state]
radon_val[radon_val <= 0.] = 0.1
log_radon = np.log(radon_val)
log_uranium = np.log(uranium)
unique_counties, county = np.unique(county_strings,
return_inverse=True)
county = county.astype(np.int32)
if log_radon.size != num_examples:
raise ValueError(
'The size of the filtered dataset must equal the input '
'`num_examples`. Saw dataset size = {}, `num_examples` = {}'
''.format(log_radon.size, num_examples))
if unique_counties.size != num_counties:
raise ValueError(
'The number of counties present in the filtered dataset must equal '
'the input `num_counties`. Saw {} counties but `num_counties` = {}'
''.format(unique_counties.size, num_counties))
if shuffle:
shuffle_idxs = np.arange(num_examples)
np.random.RandomState(shuffle_seed).shuffle(shuffle_idxs)
log_uranium = log_uranium[shuffle_idxs]
floor = floor[shuffle_idxs]
county = county[shuffle_idxs]
log_radon = log_radon[shuffle_idxs]
train_floor = floor[:num_train]
train_county = county[:num_train]
test_floor = floor[num_train:]
test_county = county[num_train:]
# Create a new features for mean of floor across counties.
xbar = []
for i in range(num_counties):
xbar.append(train_floor[county == i].mean())
floor_by_county = np.array(xbar, dtype=log_radon.dtype)
load_dataset.dataset = dict(
train_log_uranium=log_uranium[:num_train],
train_floor=train_floor,
train_county=train_county,
train_floor_by_county=floor_by_county[train_county],
train_log_radon=log_radon[:num_train],
test_log_uranium=log_uranium[num_train:],
test_floor=test_floor,
test_county=test_county,
test_floor_by_county=floor_by_county[test_county],
test_log_radon=log_radon[num_train:],
)
return load_dataset.dataset
