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variables.py
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3363 lines (2766 loc) · 125 KB
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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Variable class."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import enum # pylint: disable=g-bad-import-order
import itertools
import functools
import os
import six
from tensorflow.core.framework import attr_value_pb2
from tensorflow.core.framework import variable_pb2
from tensorflow.python import pywrap_tensorflow # pylint: disable=unused-import
from tensorflow.python import _pywrap_utils
from tensorflow.python.eager import context
from tensorflow.python.framework import dtypes
from tensorflow.python.framework import ops
from tensorflow.python.framework import tensor_shape
from tensorflow.python.ops import array_ops
from tensorflow.python.ops import control_flow_ops
from tensorflow.python.ops import gen_array_ops
from tensorflow.python.ops import gen_state_ops
from tensorflow.python.ops import gen_math_ops
from tensorflow.python.ops import math_ops
from tensorflow.python.ops import state_ops
from tensorflow.python.platform import tf_logging as logging
from tensorflow.python.training.tracking import base as trackable
from tensorflow.python.util import compat
from tensorflow.python.util import object_identity
from tensorflow.python.util import tf_should_use
from tensorflow.python.util.deprecation import deprecated
from tensorflow.python.util.deprecation import deprecated_args
from tensorflow.python.util.tf_export import tf_export
def default_variable_creator(_, **kwds):
del kwds
raise NotImplementedError("variable_scope needs to be imported")
def default_variable_creator_v2(_, **kwds):
del kwds
raise NotImplementedError("variable_scope needs to be imported")
def _make_getter(captured_getter, captured_previous):
"""To avoid capturing loop variables."""
def getter(**kwargs):
return captured_getter(captured_previous, **kwargs)
return getter
@tf_export("VariableSynchronization")
class VariableSynchronization(enum.Enum):
"""Indicates when a distributed variable will be synced.
* `AUTO`: Indicates that the synchronization will be determined by the current
`DistributionStrategy` (eg. With `MirroredStrategy` this would be
`ON_WRITE`).
* `NONE`: Indicates that there will only be one copy of the variable, so
there is no need to sync.
* `ON_WRITE`: Indicates that the variable will be updated across devices
every time it is written.
* `ON_READ`: Indicates that the variable will be aggregated across devices
when it is read (eg. when checkpointing or when evaluating an op that uses
the variable).
"""
AUTO = 0
NONE = 1
ON_WRITE = 2
ON_READ = 3
# LINT.IfChange
@tf_export("VariableAggregation", v1=[])
class VariableAggregationV2(enum.Enum):
"""Indicates how a distributed variable will be aggregated.
`tf.distribute.Strategy` distributes a model by making multiple copies
(called "replicas") acting data-parallel on different elements of the input
batch. When performing some variable-update operation, say
`var.assign_add(x)`, in a model, we need to resolve how to combine the
different values for `x` computed in the different replicas.
* `NONE`: This is the default, giving an error if you use a
variable-update operation with multiple replicas.
* `SUM`: Add the updates across replicas.
* `MEAN`: Take the arithmetic mean ("average") of the updates across replicas.
* `ONLY_FIRST_REPLICA`: This is for when every replica is performing the same
update, but we only want to perform the update once. Used, e.g., for the
global step counter.
"""
NONE = 0
SUM = 1
MEAN = 2
ONLY_FIRST_REPLICA = 3
def __hash__(self):
return hash(self.value)
def __eq__(self, other):
if self is other:
return True
elif isinstance(other, VariableAggregation):
return int(self.value) == int(other.value)
else:
return False
@tf_export(v1=["VariableAggregation"])
class VariableAggregation(enum.Enum):
NONE = 0
SUM = 1
MEAN = 2
ONLY_FIRST_REPLICA = 3
ONLY_FIRST_TOWER = 3 # DEPRECATED
def __hash__(self):
return hash(self.value)
# LINT.ThenChange(//tensorflow/core/framework/variable.proto)
#
# Note that we are currently relying on the integer values of the Python enums
# matching the integer values of the proto enums.
VariableAggregation.__doc__ = (
VariableAggregationV2.__doc__ +
"* `ONLY_FIRST_TOWER`: Deprecated alias for `ONLY_FIRST_REPLICA`.\n ")
def validate_synchronization_aggregation_trainable(synchronization, aggregation,
trainable, name):
"""Given user-provided variable properties, sets defaults and validates."""
if aggregation is None:
aggregation = VariableAggregation.NONE
else:
if not isinstance(aggregation,
(VariableAggregation, VariableAggregationV2)):
try:
aggregation = VariableAggregationV2(aggregation)
except ValueError:
raise ValueError(
"Invalid variable aggregation mode: {} for variable: {}".format(
aggregation, name))
if synchronization is None:
synchronization = VariableSynchronization.AUTO
else:
try:
synchronization = VariableSynchronization(synchronization)
except ValueError:
raise ValueError(
"Invalid variable synchronization mode: {} for variable: {}".format(
synchronization, name))
if trainable is None:
trainable = synchronization != VariableSynchronization.ON_READ
return synchronization, aggregation, trainable
class VariableMetaclass(type):
"""Metaclass to allow construction of tf.Variable to be overridden."""
def _variable_v1_call(cls,
initial_value=None,
trainable=None,
collections=None,
validate_shape=True,
caching_device=None,
name=None,
variable_def=None,
dtype=None,
expected_shape=None,
import_scope=None,
constraint=None,
use_resource=None,
synchronization=VariableSynchronization.AUTO,
aggregation=VariableAggregation.NONE,
shape=None):
"""Call on Variable class. Useful to force the signature."""
previous_getter = lambda **kwargs: default_variable_creator(None, **kwargs)
for _, getter in ops.get_default_graph()._variable_creator_stack: # pylint: disable=protected-access
previous_getter = _make_getter(getter, previous_getter)
# Reset `aggregation` that is explicitly set as `None` to the enum NONE.
if aggregation is None:
aggregation = VariableAggregation.NONE
return previous_getter(
initial_value=initial_value,
trainable=trainable,
collections=collections,
validate_shape=validate_shape,
caching_device=caching_device,
name=name,
variable_def=variable_def,
dtype=dtype,
expected_shape=expected_shape,
import_scope=import_scope,
constraint=constraint,
use_resource=use_resource,
synchronization=synchronization,
aggregation=aggregation,
shape=shape)
def _variable_v2_call(cls,
initial_value=None,
trainable=None,
validate_shape=True,
caching_device=None,
name=None,
variable_def=None,
dtype=None,
import_scope=None,
constraint=None,
synchronization=VariableSynchronization.AUTO,
aggregation=VariableAggregation.NONE,
shape=None):
"""Call on Variable class. Useful to force the signature."""
previous_getter = lambda **kws: default_variable_creator_v2(None, **kws)
for _, getter in ops.get_default_graph()._variable_creator_stack: # pylint: disable=protected-access
previous_getter = _make_getter(getter, previous_getter)
# Reset `aggregation` that is explicitly set as `None` to the enum NONE.
if aggregation is None:
aggregation = VariableAggregation.NONE
return previous_getter(
initial_value=initial_value,
trainable=trainable,
validate_shape=validate_shape,
caching_device=caching_device,
name=name,
variable_def=variable_def,
dtype=dtype,
import_scope=import_scope,
constraint=constraint,
synchronization=synchronization,
aggregation=aggregation,
shape=shape)
def __call__(cls, *args, **kwargs):
if cls is VariableV1:
return cls._variable_v1_call(*args, **kwargs)
elif cls is Variable:
return cls._variable_v2_call(*args, **kwargs)
else:
return super(VariableMetaclass, cls).__call__(*args, **kwargs)
@tf_export("Variable", v1=[])
class Variable(six.with_metaclass(VariableMetaclass, trackable.Trackable)):
"""See the [variable guide](https://tensorflow.org/guide/variable).
A variable maintains shared, persistent state manipulated by a program.
The `Variable()` constructor requires an initial value for the variable, which
can be a `Tensor` of any type and shape. This initial value defines the type
and shape of the variable. After construction, the type and shape of the
variable are fixed. The value can be changed using one of the assign methods.
>>> v = tf.Variable(1.)
>>> v.assign(2.)
<tf.Variable ... shape=() dtype=float32, numpy=2.0>
>>> v.assign_add(0.5)
<tf.Variable ... shape=() dtype=float32, numpy=2.5>
The `shape` argument to `Variable`'s constructor allows you to construct a
variable with a less defined shape than its `initial_value`:
>>> v = tf.Variable(1., shape=tf.TensorShape(None))
>>> v.assign([[1.]])
<tf.Variable ... shape=<unknown> dtype=float32, numpy=array([[1.]], ...)>
Just like any `Tensor`, variables created with `Variable()` can be used as
inputs to operations. Additionally, all the operators overloaded for the
`Tensor` class are carried over to variables.
>>> w = tf.Variable([[1.], [2.]])
>>> x = tf.constant([[3., 4.]])
>>> tf.matmul(w, x)
<tf.Tensor:... shape=(2, 2), ... numpy=
array([[3., 4.],
[6., 8.]], dtype=float32)>
>>> tf.sigmoid(w + x)
<tf.Tensor:... shape=(2, 2), ...>
When building a machine learning model it is often convenient to distinguish
between variables holding trainable model parameters and other variables such
as a `step` variable used to count training steps. To make this easier, the
variable constructor supports a `trainable=<bool>`
parameter. `tf.GradientTape` watches trainable variables by default:
>>> with tf.GradientTape(persistent=True) as tape:
... trainable = tf.Variable(1.)
... non_trainable = tf.Variable(2., trainable=False)
... x1 = trainable * 2.
... x2 = non_trainable * 3.
>>> tape.gradient(x1, trainable)
<tf.Tensor:... shape=(), dtype=float32, numpy=2.0>
>>> assert tape.gradient(x2, non_trainable) is None # Unwatched
Variables are automatically tracked when assigned to attributes of types
inheriting from `tf.Module`.
>>> m = tf.Module()
>>> m.v = tf.Variable([1.])
>>> m.trainable_variables
(<tf.Variable ... shape=(1,) ... numpy=array([1.], dtype=float32)>,)
This tracking then allows saving variable values to
[training checkpoints](https://www.tensorflow.org/guide/checkpoint), or to
[SavedModels](https://www.tensorflow.org/guide/saved_model) which include
serialized TensorFlow graphs.
Variables are often captured and manipulated by `tf.function`s. This works the
same way the un-decorated function would have:
>>> v = tf.Variable(0.)
>>> read_and_decrement = tf.function(lambda: v.assign_sub(0.1))
>>> read_and_decrement()
<tf.Tensor: shape=(), dtype=float32, numpy=-0.1>
>>> read_and_decrement()
<tf.Tensor: shape=(), dtype=float32, numpy=-0.2>
Variables created inside a `tf.function` must be owned outside the function
and be created only once:
>>> class M(tf.Module):
... @tf.function
... def __call__(self, x):
... if not hasattr(self, "v"): # Or set self.v to None in __init__
... self.v = tf.Variable(x)
... return self.v * x
>>> m = M()
>>> m(2.)
<tf.Tensor: shape=(), dtype=float32, numpy=4.0>
>>> m(3.)
<tf.Tensor: shape=(), dtype=float32, numpy=6.0>
>>> m.v
<tf.Variable ... shape=() dtype=float32, numpy=2.0>
See the `tf.function` documentation for details.
"""
@deprecated_args(
None,
"A variable's value can be manually cached by calling "
"tf.Variable.read_value() under a tf.device scope. The caching_device "
"argument does not work properly.",
"caching_device")
def __init__(self,
initial_value=None,
trainable=None,
validate_shape=True,
caching_device=None,
name=None,
variable_def=None,
dtype=None,
import_scope=None,
constraint=None,
synchronization=VariableSynchronization.AUTO,
aggregation=VariableAggregation.NONE,
shape=None):
"""Creates a new variable with value `initial_value`.
Args:
initial_value: A `Tensor`, or Python object convertible to a `Tensor`,
which is the initial value for the Variable. The initial value must have
a shape specified unless `validate_shape` is set to False. Can also be a
callable with no argument that returns the initial value when called. In
that case, `dtype` must be specified. (Note that initializer functions
from init_ops.py must first be bound to a shape before being used here.)
trainable: If `True`, GradientTapes automatically watch uses of this
variable. Defaults to `True`, unless `synchronization` is set to
`ON_READ`, in which case it defaults to `False`.
validate_shape: If `False`, allows the variable to be initialized with a
value of unknown shape. If `True`, the default, the shape of
`initial_value` must be known.
caching_device: Optional device string describing where the Variable
should be cached for reading. Defaults to the Variable's device. If not
`None`, caches on another device. Typical use is to cache on the device
where the Ops using the Variable reside, to deduplicate copying through
`Switch` and other conditional statements.
name: Optional name for the variable. Defaults to `'Variable'` and gets
uniquified automatically.
variable_def: `VariableDef` protocol buffer. If not `None`, recreates the
Variable object with its contents, referencing the variable's nodes in
the graph, which must already exist. The graph is not changed.
`variable_def` and the other arguments are mutually exclusive.
dtype: If set, initial_value will be converted to the given type. If
`None`, either the datatype will be kept (if `initial_value` is a
Tensor), or `convert_to_tensor` will decide.
import_scope: Optional `string`. Name scope to add to the `Variable.` Only
used when initializing from protocol buffer.
constraint: An optional projection function to be applied to the variable
after being updated by an `Optimizer` (e.g. used to implement norm
constraints or value constraints for layer weights). The function must
take as input the unprojected Tensor representing the value of the
variable and return the Tensor for the projected value (which must have
the same shape). Constraints are not safe to use when doing asynchronous
distributed training.
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.
aggregation: Indicates how a distributed variable will be aggregated.
Accepted values are constants defined in the class
`tf.VariableAggregation`.
shape: (optional) The shape of this variable. If None, the shape of
`initial_value` will be used. When setting this argument to
`tf.TensorShape(None)` (representing an unspecified shape), the variable
can be assigned with values of different shapes.
Raises:
ValueError: If both `variable_def` and initial_value are specified.
ValueError: If the initial value is not specified, or does not have a
shape and `validate_shape` is `True`.
"""
raise NotImplementedError
def __repr__(self):
raise NotImplementedError
def value(self):
"""Returns the last snapshot of this variable.
You usually do not need to call this method as all ops that need the value
of the variable call it automatically through a `convert_to_tensor()` call.
Returns a `Tensor` which holds the value of the variable. You can not
assign a new value to this tensor as it is not a reference to the variable.
To avoid copies, if the consumer of the returned value is on the same device
as the variable, this actually returns the live value of the variable, not
a copy. Updates to the variable are seen by the consumer. If the consumer
is on a different device it will get a copy of the variable.
Returns:
A `Tensor` containing the value of the variable.
"""
raise NotImplementedError
def read_value(self):
"""Returns the value of this variable, read in the current context.
Can be different from value() if it's on another device, with control
dependencies, etc.
Returns:
A `Tensor` containing the value of the variable.
"""
raise NotImplementedError
def set_shape(self, shape):
"""Overrides the shape for this variable.
Args:
shape: the `TensorShape` representing the overridden shape.
"""
raise NotImplementedError
@property
def trainable(self):
raise NotImplementedError
@property
def synchronization(self):
raise NotImplementedError
@property
def aggregation(self):
raise NotImplementedError
def eval(self, session=None):
"""In a session, computes and returns the value of this variable.
This is not a graph construction method, it does not add ops to the graph.
This convenience method requires a session where the graph
containing this variable has been launched. If no session is
passed, the default session is used. See `tf.compat.v1.Session` for more
information on launching a graph and on sessions.
```python
v = tf.Variable([1, 2])
init = tf.compat.v1.global_variables_initializer()
with tf.compat.v1.Session() as sess:
sess.run(init)
# Usage passing the session explicitly.
print(v.eval(sess))
# Usage with the default session. The 'with' block
# above makes 'sess' the default session.
print(v.eval())
```
Args:
session: The session to use to evaluate this variable. If none, the
default session is used.
Returns:
A numpy `ndarray` with a copy of the value of this variable.
"""
raise NotImplementedError
@deprecated(
None, "Use Variable.read_value. Variables in 2.X are initialized "
"automatically both in eager and graph (inside tf.defun) contexts.")
def initialized_value(self):
"""Returns the value of the initialized variable.
You should use this instead of the variable itself to initialize another
variable with a value that depends on the value of this variable.
```python
# Initialize 'v' with a random tensor.
v = tf.Variable(tf.random.truncated_normal([10, 40]))
# Use `initialized_value` to guarantee that `v` has been
# initialized before its value is used to initialize `w`.
# The random values are picked only once.
w = tf.Variable(v.initialized_value() * 2.0)
```
Returns:
A `Tensor` holding the value of this variable after its initializer
has run.
"""
with ops.init_scope():
return control_flow_ops.cond(
is_variable_initialized(self), self.read_value,
lambda: self.initial_value)
@property
def initial_value(self):
"""Returns the Tensor used as the initial value for the variable.
Note that this is different from `initialized_value()` which runs
the op that initializes the variable before returning its value.
This method returns the tensor that is used by the op that initializes
the variable.
Returns:
A `Tensor`.
"""
raise NotImplementedError
@property
def constraint(self):
"""Returns the constraint function associated with this variable.
Returns:
The constraint function that was passed to the variable constructor.
Can be `None` if no constraint was passed.
"""
raise NotImplementedError
def assign(self, value, use_locking=False, name=None, read_value=True):
"""Assigns a new value to the variable.
This is essentially a shortcut for `assign(self, value)`.
Args:
value: A `Tensor`. The new value for this variable.
use_locking: If `True`, use locking during the assignment.
name: The name of the operation to be created
read_value: if True, will return something which evaluates to the new
value of the variable; if False will return the assign op.
Returns:
The updated variable. If `read_value` is false, instead returns None in
Eager mode and the assign op in graph mode.
"""
raise NotImplementedError
def assign_add(self, delta, use_locking=False, name=None, read_value=True):
"""Adds a value to this variable.
This is essentially a shortcut for `assign_add(self, delta)`.
Args:
delta: A `Tensor`. The value to add to this variable.
use_locking: If `True`, use locking during the operation.
name: The name of the operation to be created
read_value: if True, will return something which evaluates to the new
value of the variable; if False will return the assign op.
Returns:
The updated variable. If `read_value` is false, instead returns None in
Eager mode and the assign op in graph mode.
"""
raise NotImplementedError
def assign_sub(self, delta, use_locking=False, name=None, read_value=True):
"""Subtracts a value from this variable.
This is essentially a shortcut for `assign_sub(self, delta)`.
Args:
delta: A `Tensor`. The value to subtract from this variable.
use_locking: If `True`, use locking during the operation.
name: The name of the operation to be created
read_value: if True, will return something which evaluates to the new
value of the variable; if False will return the assign op.
Returns:
The updated variable. If `read_value` is false, instead returns None in
Eager mode and the assign op in graph mode.
"""
raise NotImplementedError
def scatter_sub(self, sparse_delta, use_locking=False, name=None):
"""Subtracts `tf.IndexedSlices` from this variable.
Args:
sparse_delta: `tf.IndexedSlices` to be subtracted from this variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_add(self, sparse_delta, use_locking=False, name=None):
"""Adds `tf.IndexedSlices` to this variable.
Args:
sparse_delta: `tf.IndexedSlices` to be added to this variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_max(self, sparse_delta, use_locking=False, name=None):
"""Updates this variable with the max of `tf.IndexedSlices` and itself.
Args:
sparse_delta: `tf.IndexedSlices` to use as an argument of max with this
variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_min(self, sparse_delta, use_locking=False, name=None):
"""Updates this variable with the min of `tf.IndexedSlices` and itself.
Args:
sparse_delta: `tf.IndexedSlices` to use as an argument of min with this
variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_mul(self, sparse_delta, use_locking=False, name=None):
"""Multiply this variable by `tf.IndexedSlices`.
Args:
sparse_delta: `tf.IndexedSlices` to multiply this variable by.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_div(self, sparse_delta, use_locking=False, name=None):
"""Divide this variable by `tf.IndexedSlices`.
Args:
sparse_delta: `tf.IndexedSlices` to divide this variable by.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_update(self, sparse_delta, use_locking=False, name=None):
"""Assigns `tf.IndexedSlices` to this variable.
Args:
sparse_delta: `tf.IndexedSlices` to be assigned to this variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def batch_scatter_update(self, sparse_delta, use_locking=False, name=None):
"""Assigns `tf.IndexedSlices` to this variable batch-wise.
Analogous to `batch_gather`. This assumes that this variable and the
sparse_delta IndexedSlices have a series of leading dimensions that are the
same for all of them, and the updates are performed on the last dimension of
indices. In other words, the dimensions should be the following:
`num_prefix_dims = sparse_delta.indices.ndims - 1`
`batch_dim = num_prefix_dims + 1`
`sparse_delta.updates.shape = sparse_delta.indices.shape + var.shape[
batch_dim:]`
where
`sparse_delta.updates.shape[:num_prefix_dims]`
`== sparse_delta.indices.shape[:num_prefix_dims]`
`== var.shape[:num_prefix_dims]`
And the operation performed can be expressed as:
`var[i_1, ..., i_n,
sparse_delta.indices[i_1, ..., i_n, j]] = sparse_delta.updates[
i_1, ..., i_n, j]`
When sparse_delta.indices is a 1D tensor, this operation is equivalent to
`scatter_update`.
To avoid this operation one can looping over the first `ndims` of the
variable and using `scatter_update` on the subtensors that result of slicing
the first dimension. This is a valid option for `ndims = 1`, but less
efficient than this implementation.
Args:
sparse_delta: `tf.IndexedSlices` to be assigned to this variable.
use_locking: If `True`, use locking during the operation.
name: the name of the operation.
Returns:
The updated variable.
Raises:
TypeError: if `sparse_delta` is not an `IndexedSlices`.
"""
raise NotImplementedError
def scatter_nd_sub(self, indices, updates, name=None):
"""Applies sparse subtraction to individual values or slices in a Variable.
Assuming the variable has rank `P` and `indices` is a `Tensor` of rank `Q`.
`indices` must be integer tensor, containing indices into self.
It must be shape `[d_0, ..., d_{Q-2}, K]` where `0 < K <= P`.
The innermost dimension of `indices` (with length `K`) corresponds to
indices into elements (if `K = P`) or slices (if `K < P`) along the `K`th
dimension of self.
`updates` is `Tensor` of rank `Q-1+P-K` with shape:
```
[d_0, ..., d_{Q-2}, self.shape[K], ..., self.shape[P-1]].
```
For example, say we want to add 4 scattered elements to a rank-1 tensor to
8 elements. In Python, that update would look like this:
```python
v = tf.Variable([1, 2, 3, 4, 5, 6, 7, 8])
indices = tf.constant([[4], [3], [1] ,[7]])
updates = tf.constant([9, 10, 11, 12])
op = v.scatter_nd_sub(indices, updates)
with tf.compat.v1.Session() as sess:
print sess.run(op)
```
The resulting update to v would look like this:
[1, -9, 3, -6, -6, 6, 7, -4]
See `tf.scatter_nd` for more details about how to make updates to
slices.
Args:
indices: The indices to be used in the operation.
updates: The values to be used in the operation.
name: the name of the operation.
Returns:
The updated variable.
"""
raise NotImplementedError
def scatter_nd_add(self, indices, updates, name=None):
"""Applies sparse addition to individual values or slices in a Variable.
The Variable has rank `P` and `indices` is a `Tensor` of rank `Q`.
`indices` must be integer tensor, containing indices into self.
It must be shape `[d_0, ..., d_{Q-2}, K]` where `0 < K <= P`.
The innermost dimension of `indices` (with length `K`) corresponds to
indices into elements (if `K = P`) or slices (if `K < P`) along the `K`th
dimension of self.
`updates` is `Tensor` of rank `Q-1+P-K` with shape:
```
[d_0, ..., d_{Q-2}, self.shape[K], ..., self.shape[P-1]].
```
For example, say we want to add 4 scattered elements to a rank-1 tensor to
8 elements. In Python, that update would look like this:
```python
v = tf.Variable([1, 2, 3, 4, 5, 6, 7, 8])
indices = tf.constant([[4], [3], [1] ,[7]])
updates = tf.constant([9, 10, 11, 12])
add = v.scatter_nd_add(indices, updates)
with tf.compat.v1.Session() as sess:
print sess.run(add)
```
The resulting update to v would look like this:
[1, 13, 3, 14, 14, 6, 7, 20]
See `tf.scatter_nd` for more details about how to make updates to
slices.
Args:
indices: The indices to be used in the operation.
updates: The values to be used in the operation.
name: the name of the operation.
Returns:
The updated variable.
"""
raise NotImplementedError
def scatter_nd_update(self, indices, updates, name=None):
"""Applies sparse assignment to individual values or slices in a Variable.
The Variable has rank `P` and `indices` is a `Tensor` of rank `Q`.
`indices` must be integer tensor, containing indices into self.
It must be shape `[d_0, ..., d_{Q-2}, K]` where `0 < K <= P`.
The innermost dimension of `indices` (with length `K`) corresponds to
indices into elements (if `K = P`) or slices (if `K < P`) along the `K`th
dimension of self.
`updates` is `Tensor` of rank `Q-1+P-K` with shape:
```
[d_0, ..., d_{Q-2}, self.shape[K], ..., self.shape[P-1]].
```
For example, say we want to add 4 scattered elements to a rank-1 tensor to
8 elements. In Python, that update would look like this:
```python
v = tf.Variable([1, 2, 3, 4, 5, 6, 7, 8])
indices = tf.constant([[4], [3], [1] ,[7]])
updates = tf.constant([9, 10, 11, 12])
op = v.scatter_nd_assign(indices, updates)
with tf.compat.v1.Session() as sess:
print sess.run(op)
```
The resulting update to v would look like this:
[1, 11, 3, 10, 9, 6, 7, 12]
See `tf.scatter_nd` for more details about how to make updates to
slices.
Args:
indices: The indices to be used in the operation.
updates: The values to be used in the operation.
name: the name of the operation.
Returns:
The updated variable.
"""
raise NotImplementedError
def sparse_read(self, indices, name=None):
r"""Gather slices from params axis axis according to indices.
This function supports a subset of tf.gather, see tf.gather for details on
usage.
Args:
indices: The index `Tensor`. Must be one of the following types: `int32`,
`int64`. Must be in range `[0, params.shape[axis])`.
name: A name for the operation (optional).
Returns:
A `Tensor`. Has the same type as `params`.
"""
raise AttributeError
def gather_nd(self, indices, name=None):
r"""Gather slices from `params` into a Tensor with shape specified by `indices`.
See tf.gather_nd for details.
Args:
indices: A `Tensor`. Must be one of the following types: `int32`, `int64`.
Index tensor.
name: A name for the operation (optional).
Returns:
A `Tensor`. Has the same type as `params`.
"""
raise AttributeError
@deprecated(None, "Prefer Dataset.range instead.")
def count_up_to(self, limit):
"""Increments this variable until it reaches `limit`.
When that Op is run it tries to increment the variable by `1`. If
incrementing the variable would bring it above `limit` then the Op raises
the exception `OutOfRangeError`.
If no error is raised, the Op outputs the value of the variable before
the increment.
This is essentially a shortcut for `count_up_to(self, limit)`.
Args:
limit: value at which incrementing the variable raises an error.
Returns:
A `Tensor` that will hold the variable value before the increment. If no
other Op modifies this variable, the values produced will all be
distinct.
"""
raise NotImplementedError
@deprecated(None,
"Prefer Variable.assign which has equivalent behavior in 2.X.")
def load(self, value, session=None):
"""Load new value into this variable.
Writes new value to variable's memory. Doesn't add ops to the graph.
This convenience method requires a session where the graph
containing this variable has been launched. If no session is
passed, the default session is used. See `tf.compat.v1.Session` for more
information on launching a graph and on sessions.
```python
v = tf.Variable([1, 2])
init = tf.compat.v1.global_variables_initializer()
with tf.compat.v1.Session() as sess:
sess.run(init)