| /* Copyright 2018 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| |
| #ifndef TENSORFLOW_COMPILER_JIT_INCREASE_DYNAMISM_FOR_AUTO_JIT_PASS_H_ |
| #define TENSORFLOW_COMPILER_JIT_INCREASE_DYNAMISM_FOR_AUTO_JIT_PASS_H_ |
| |
| #include "tensorflow/core/common_runtime/optimization_registry.h" |
| |
| namespace tensorflow { |
| |
| // Increases the amount of "dynamism" representable by XLA clusters by rewriting |
| // the TensorFlow graph. This pass does the following rewrites: |
| // |
| // Slice |
| // ----- |
| // |
| // Slice(op, begin, size <must be constant>) => |
| // Slice(op, begin, actual_size(op.shape(), size, begin)); |
| // _XlaCompileTimeConstantInputs={2} |
| // |
| // where |
| // |
| // actual_size(op_shape, size, begin)[i] = |
| // size[i] == -1 ? (op_shape[i] - size[i]) |
| // : size[i] |
| // |
| // This pass, combined with jit/partially_decluster_pass, reduces the number of |
| // unnecessary cluster recompilations in some common cases. After the rewrite |
| // shown above jit/partially_decluster_pass extracts the actual_size(...) |
| // computation to outside the XLA cluster, causing the cluster to be versioned |
| // only on the actual size of the XlaDynamicSlice. This avoids recompilation |
| // due to superficial changes that don't affect tensor shapes. |
| // |
| // Future Work TODO(b/111210515) |
| // ----------------------------- |
| // |
| // In the future we will also translate StridedSlice and Pad a similar way. |
| class IncreaseDynamismForAutoJitPass : public GraphOptimizationPass { |
| public: |
| Status Run(const GraphOptimizationPassOptions& options) override; |
| }; |
| |
| } // namespace tensorflow |
| |
| #endif // TENSORFLOW_COMPILER_JIT_INCREASE_DYNAMISM_FOR_AUTO_JIT_PASS_H_ |