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_DTENSOR_MLIR_EXPANSIONS_SAVE_RESTORE_SPMD_EXPANDER_H_ 17 #define TENSORFLOW_DTENSOR_MLIR_EXPANSIONS_SAVE_RESTORE_SPMD_EXPANDER_H_ 18 19 #include "tensorflow/dtensor/mlir/layout_parsing.h" 20 #include "tensorflow/dtensor/mlir/spmd_expander.h" 21 22 namespace tensorflow { 23 namespace dtensor { 24 25 class SaveRestoreSPMDExpander : public SPMDExpanderBase { 26 public: 27 StatusOr<mlir::Operation*> ExpandOp(mlir::Operation* op) override; 28 29 StatusOr<llvm::DenseMap<int, Layout>> ComputeLayoutForward( 30 mlir::Operation* op, const llvm::DenseMap<int, Layout>& input_layouts, 31 const llvm::DenseMap<int, Layout>& output_layouts) override; 32 33 StatusOr<llvm::DenseMap<int, Layout>> ComputeLayoutBackward( 34 mlir::Operation* op, 35 const llvm::DenseMap<int, Layout>& output_layouts) override; 36 }; 37 38 // SPMD expansion for DTensorShardPrefix op. 39 // The expansion merely sets the output layout as a rank 1 replicated tensor. 40 class DTensorShardPrefixSPMDExpander : public SPMDExpanderBase { 41 public: ExpandOp(mlir::Operation * op)42 StatusOr<mlir::Operation*> ExpandOp(mlir::Operation* op) override { 43 return op; 44 }; 45 ComputeLayoutForward(mlir::Operation * op,const llvm::DenseMap<int,Layout> & input_layouts)46 StatusOr<llvm::DenseMap<int, Layout>> ComputeLayoutForward( 47 mlir::Operation* op, 48 const llvm::DenseMap<int, Layout>& input_layouts) override { 49 TF_ASSIGN_OR_RETURN(auto mesh, ExtractDeviceMeshEnclosingCluster(op)); 50 return llvm::DenseMap<int, Layout>( 51 {{0, Layout::ReplicatedOnMesh(mesh, /*rank=*/1)}}); 52 } 53 ComputeLayoutBackward(mlir::Operation * op,const llvm::DenseMap<int,Layout> & output_layouts)54 StatusOr<llvm::DenseMap<int, Layout>> ComputeLayoutBackward( 55 mlir::Operation* op, 56 const llvm::DenseMap<int, Layout>& output_layouts) override { 57 return llvm::DenseMap<int, Layout>(); 58 } 59 }; 60 61 } // namespace dtensor 62 } // namespace tensorflow 63 64 #endif // TENSORFLOW_DTENSOR_MLIR_EXPANSIONS_SAVE_RESTORE_SPMD_EXPANDER_H_ 65