1 /* Copyright 2020 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations 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 23 namespace 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. 37 Status 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