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 #ifndef TENSORFLOW_CORE_TPU_KERNELS_TPU_EXECUTE_OP_H_ 16 #define TENSORFLOW_CORE_TPU_KERNELS_TPU_EXECUTE_OP_H_ 17 18 #include <memory> 19 #include <vector> 20 21 #include "tensorflow/core/framework/op.h" 22 #include "tensorflow/core/framework/op_kernel.h" 23 #include "tensorflow/core/platform/macros.h" 24 #include "tensorflow/core/platform/mutex.h" 25 26 namespace tensorflow { 27 28 // Op that executes a precompiled TPU computation. 29 class TPUExecuteOp : public AsyncOpKernel { 30 public: 31 explicit TPUExecuteOp(OpKernelConstruction* context); 32 ~TPUExecuteOp() override; 33 34 AsyncOpKernel* AsAsync() override; 35 36 void Compute(OpKernelContext* context) override; 37 void ComputeAsync(OpKernelContext* context, DoneCallback done) override; 38 39 protected: 40 // Used by TPUExecuteAndUpdateVariablesOp to set the fused variable reads and 41 // updates indices in the XLA computation. The two vectors must have the same 42 // size, and a pair of read index and write index represents a variable's 43 // input to the program and its updated value from the program. If the 44 // variable is not updated, use -1 as the output index. 45 std::vector<int> fused_device_var_reads_in_computation_inputs_; 46 std::vector<int> fused_device_var_updates_in_computation_outputs_; 47 48 private: 49 Status DoWork(OpKernelContext* context); 50 51 TF_DISALLOW_COPY_AND_ASSIGN(TPUExecuteOp); 52 }; 53 54 // A variant of TPUExecuteOp that contains fused device variable reads and 55 // updates. 56 class TPUExecuteAndUpdateVariablesOp : public TPUExecuteOp { 57 public: 58 explicit TPUExecuteAndUpdateVariablesOp(OpKernelConstruction* context); 59 ~TPUExecuteAndUpdateVariablesOp() override = default; 60 61 private: 62 TF_DISALLOW_COPY_AND_ASSIGN(TPUExecuteAndUpdateVariablesOp); 63 }; 64 65 } // namespace tensorflow 66 67 #endif // TENSORFLOW_CORE_TPU_KERNELS_TPU_EXECUTE_OP_H_ 68