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_COMPILER_XLA_SERVICE_ALL_GATHER_DECOMPOSER_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_ALL_GATHER_DECOMPOSER_H_ 18 19 #include "tensorflow/compiler/xla/service/hlo_instructions.h" 20 #include "tensorflow/compiler/xla/service/hlo_module.h" 21 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 22 23 namespace xla { 24 25 // AllGatherDecomposer is a pass which converts unsupported all-gathers into 26 // dynamic-update-slices and all-reduces. 27 class AllGatherDecomposer : public HloModulePass { 28 public: AllGatherDecomposer(std::function<bool (const HloAllGatherInstruction &)> should_decompose)29 explicit AllGatherDecomposer( 30 std::function<bool(const HloAllGatherInstruction&)> should_decompose) 31 : should_decompose_(std::move(should_decompose)) {} AllGatherDecomposer()32 AllGatherDecomposer() 33 : should_decompose_( 34 [](const HloAllGatherInstruction& ag) { return true; }) {} name()35 absl::string_view name() const override { return "all_gather_decomposer"; } 36 37 // Run AllGatherDecomposer pass on computations in 'module'. 38 // Returns whether the 'module' was changed. 39 StatusOr<bool> Run(HloModule* module) override; 40 41 private: 42 std::function<bool(const HloAllGatherInstruction&)> should_decompose_; 43 int64 partition_count_; 44 }; 45 46 } // namespace xla 47 48 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_ALL_GATHER_DECOMPOSER_H_ 49