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TensorFlow.NET/src/TensorFlowNET.Core/Graphs/Graph.Control.cs at master · AlfRjw/TensorFlow.NET · GitHub
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TensorFlow.NET
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src
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TensorFlowNET.Core
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Graphs
/
Graph.Control.cs
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TensorFlow.NET
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TensorFlowNET.Core
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Graphs
/
Graph.Control.cs
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/*****************************************************************************
Copyright 2018 The TensorFlow.NET 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.
******************************************************************************/
using
System
.
Collections
.
Generic
;
using
System
.
Diagnostics
.
CodeAnalysis
;
using
System
.
Linq
;
using
Tensorflow
.
Operations
;
namespace
Tensorflow
{
public
partial
class
Graph
{
// Current control flow context. It could be either CondContext or WhileContext
public
ControlFlowContext
_control_flow_context
;
// represents the nested with(...) statements
public
List
<
_ControlDependenciesController
>
_control_dependencies_stack
{
get
;
set
;
}
=
new
List
<
_ControlDependenciesController
>
(
)
;
/// <summary>
/// For an op that takes `input_ops` as inputs, compute control inputs.
/// </summary>
/// <param name="input_ops">The data input ops for an op to be created.</param>
/// <returns>A list of control inputs for the op to be created.</returns>
public
ITensorOrOperation
[
]
_control_dependencies_for_inputs
(
ITensorOrOperation
[
]
input_ops
)
{
var
ret
=
new
List
<
ITensorOrOperation
>
(
)
;
foreach
(
var
controller
in
_control_dependencies_stack
)
{
bool
dominated
=
false
;
// If any of the input_ops already depends on the inputs from controller,
// we say that the new op is dominated (by that input), and we therefore
// do not need to add control dependencies for this controller's inputs.
foreach
(
var
op
in
input_ops
)
{
if
(
controller
.
op_in_group
(
op
)
)
{
dominated
=
true
;
break
;
}
}
if
(
!
dominated
)
ret
.
AddRange
(
controller
.
control_inputs
.
Where
(
x
=>
!
input_ops
.
Contains
(
x
)
)
)
;
}
return
ret
.
ToArray
(
)
;
}
/// <summary>
/// Returns a context manager that specifies control dependencies.
///
/// Use with the `with` keyword to specify that all operations constructed
/// within the context should have control dependencies on
/// `control_inputs`.
/// </summary>
[
SuppressMessage
(
"ReSharper"
,
"CoVariantArrayConversion"
)
]
public
_ControlDependenciesController
control_dependencies
(
ITensorOrOperation
[
]
control_inputs
)
=>
control_dependencies
(
(
object
[
]
)
control_inputs
)
;
/// <summary>
/// Returns a context manager that specifies control dependencies.
///
/// Use with the `with` keyword to specify that all operations constructed
/// within the context should have control dependencies on
/// `control_inputs`.
/// </summary>
public
_ControlDependenciesController
control_dependencies
(
object
[
]
control_inputs
)
{
if
(
control_inputs
==
null
)
return
new
_ControlDependenciesController
(
this
,
null
)
;
var
control_ops
=
new
List
<
ITensorOrOperation
>
(
)
;
foreach
(
var
c
in
control_inputs
)
{
switch
(
c
)
{
// TODO: implement IndexedSlices
//case IndexedSlices islice:
// control_ops.Add(islice.op);
// break;
case
Tensor
t
:
control_ops
.
Add
(
t
.
op
)
;
break
;
case
Operation
op
:
control_ops
.
Add
(
op
)
;
break
;
default
:
var
t1
=
_as_graph_element
(
c
)
;
if
(
t1
==
null
)
throw
new
TypeError
(
$
"Control input must be Operation or Tensor:
{
c
}
"
)
;
control_ops
.
Add
(
t1
.
op
)
;
break
;
}
}
return
new
_ControlDependenciesController
(
this
,
control_ops
)
;
}
/// <summary>
/// Returns the current control flow context.
/// </summary>
/// <returns>A context object.</returns>
public
ControlFlowContext
_get_control_flow_context
(
)
{
return
_control_flow_context
;
}
/// <summary>
/// Sets the current control flow context.
/// </summary>
/// <param name="ctx">a context object.</param>
public
void
_set_control_flow_context
(
ControlFlowContext
ctx
)
{
_control_flow_context
=
ctx
;
}
public
void
_push_control_dependencies_controller
(
_ControlDependenciesController
controller
)
{
_control_dependencies_stack
.
Add
(
controller
)
;
}
public
void
_pop_control_dependencies_controller
(
_ControlDependenciesController
controller
)
{
_control_dependencies_stack
.
RemoveAt
(
_control_dependencies_stack
.
Count
-
1
)
;
}
/// <summary>
/// Record that the given op depends on all registered control dependencies.
/// </summary>
public
void
_record_op_seen_by_control_dependencies
(
Operation
op
)
{
foreach
(
var
controller
in
_control_dependencies_stack
)
controller
.
add_op
(
op
)
;
}
}
}
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