1/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_ISOLATE_PLACER_INSPECTION_REQUIRED_OPS_PASS_H_
17#define TENSORFLOW_CORE_COMMON_RUNTIME_ISOLATE_PLACER_INSPECTION_REQUIRED_OPS_PASS_H_
18
19#include "tensorflow/core/common_runtime/optimization_registry.h"
20
21namespace tensorflow {
22// Adds Identities for each input/output of function-calling ops.
23//
24// For example, the following graph calling a function on inputs `a` and `b`
25// and producing output `y` will be rewritted to include identities on all
26// edges:
27//
28// a b
29// | |
30// v v
31// f (PartitionedCallOp)
32// |
33// v
34// y
35//
36// is transformed to
37//
38// a b
39// | |
40// a_f (Identity) a_f (Identity)
41// | |
42// v v
43// f (PartitionedCallOp)
44// |
45// f_y (Identity)
46// |
47// v
48// y
49//
50// This pass is currently needed to simplify correctly placing the nodes
51// producing inputs for as well as consuming output from function-calling ops.
52//
53// This pass should also help to implement replacing PartitionedCallOp with
54// component function calls (to avoid copying input/output tensors), if we get
55// to it.
56class IsolatePlacerInspectionRequiredOpsPass : public GraphOptimizationPass {
57 public:
58 Status Run(const GraphOptimizationPassOptions& options) override;
59};
60
61} // namespace tensorflow
62
63#endif // TENSORFLOW_CORE_COMMON_RUNTIME_ISOLATE_PLACER_INSPECTION_REQUIRED_OPS_PASS_H_
64