1/* Copyright 2020 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_REPLICATE_PER_REPLICA_NODES_H_
17#define TENSORFLOW_CORE_COMMON_RUNTIME_REPLICATE_PER_REPLICA_NODES_H_
18
19#include "absl/container/flat_hash_map.h"
20#include "tensorflow/core/graph/graph.h"
21#include "tensorflow/core/lib/core/status.h"
22
23namespace tensorflow {
24
25// `composite_device` maps from a virtual device to a set of devices.
26// In a function graph, for each node assigned to a composite device
27// (representing N devices), replace it with N replicated nodes (one per
28// device).
29// REQUIREMENTS:
30// 1) Each node has been assigned to a device (including composite device).
31// 2) Each cluster of nodes assigned to a composite device should include at
32// least one "_Arg" node.
33// composite device.
34// 3) Clusters assigned to different composite devices should have no data
35// dependency.
36// TODO(b/145922293): Register it as a POST_REWRITE_FOR_EXEC pass.
37Status ReplicatePerReplicaNodesInFunctionGraph(
38 const absl::flat_hash_map<string, const std::vector<string>*>&
39 composite_devices,
40 Graph* graph);
41
42} // namespace tensorflow
43
44#endif // TENSORFLOW_CORE_COMMON_RUNTIME_REPLICATE_PER_REPLICA_NODES_H_
45