1 /* Copyright 2022 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_LAYOUT_NORMALIZATION_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_LAYOUT_NORMALIZATION_H_ 18 19 #include <utility> 20 21 #include "absl/strings/string_view.h" 22 #include "tensorflow/compiler/xla/service/hlo_module.h" 23 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 24 #include "tensorflow/compiler/xla/statusor.h" 25 26 namespace xla { 27 28 // Normalize shapes for some subsets of HLOs. 29 // 30 // A shape is called "normalized" when it's layout is descending, and no 31 // degenerate dimensions are present. 32 // 33 // The normalization pass converts shapes to physically-equivalent but 34 // normalized ones, e.g. f32[5,1,4]{0,1,2} is converted to f32[4,5]{1,0}. 35 class LayoutNormalization : public HloModulePass { 36 public: name()37 absl::string_view name() const override { return "layout_normalization"; } 38 using HloPassInterface::Run; 39 StatusOr<bool> Run( 40 HloModule* module, 41 const absl::flat_hash_set<absl::string_view>& execution_threads) override; 42 }; 43 44 } // end namespace xla 45 46 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_LAYOUT_NORMALIZATION_H_ 47