1 /* Copyright 2021 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_TPU_KERNELS_TPU_RESHARD_VARIABLES_OP_H_ 17 #define TENSORFLOW_CORE_TPU_KERNELS_TPU_RESHARD_VARIABLES_OP_H_ 18 19 #include <memory> 20 21 #include "tensorflow/core/framework/op.h" 22 #include "tensorflow/core/framework/op_kernel.h" 23 #include "tensorflow/core/platform/mutex.h" 24 #include "tensorflow/core/tpu/kernels/tpu_compilation_cache_common.pb.h" 25 26 namespace tensorflow { 27 28 // Op that changes the sharding state for a set of on-device variables. The 29 // sharding state is represented as the key of the compilation that generated 30 // the sharding/unsharding programs along with the main program. The op checks 31 // if the current sharding state matches the desired one, and if not, uses the 32 // sharding/unsharding programs to transform the variables to the desired state. 33 class TPUReshardVariablesOpKernel : public AsyncOpKernel { 34 public: 35 explicit TPUReshardVariablesOpKernel(OpKernelConstruction* context); 36 ~TPUReshardVariablesOpKernel() override; 37 38 void ComputeAsync(OpKernelContext* context, DoneCallback done) override; 39 40 private: 41 Status DoWork(OpKernelContext* context); 42 Status DoTpuExecute(OpKernelContext* context, const Tensor& format_key, 43 tpu::CompilationCacheFetchTarget fetch_target); 44 45 int64_t num_vars_; 46 }; 47 48 } // namespace tensorflow 49 50 #endif // TENSORFLOW_CORE_TPU_KERNELS_TPU_RESHARD_VARIABLES_OP_H_ 51