1 /* Copyright 2018 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_GRAPPLER_OPTIMIZERS_FUNCTION_OPTIMIZER_H_ 17 #define TENSORFLOW_CORE_GRAPPLER_OPTIMIZERS_FUNCTION_OPTIMIZER_H_ 18 19 #include "tensorflow/core/grappler/optimizers/graph_optimizer.h" 20 #include "tensorflow/core/protobuf/rewriter_config.pb.h" 21 22 namespace tensorflow { 23 namespace grappler { 24 25 // Remap TensorFlow subgraphs onto alternative operations or collection of 26 // operations to make the overall graph more efficient. 27 class FunctionOptimizer : public GraphOptimizer { 28 public: FunctionOptimizer(RewriterConfig::Toggle opt_level)29 explicit FunctionOptimizer(RewriterConfig::Toggle opt_level) 30 : opt_level_(opt_level) {} 31 ~FunctionOptimizer() override = default; 32 name()33 string name() const override { return "function_optimizer"; }; 34 35 Status Optimize(Cluster* cluster, const GrapplerItem& item, 36 GraphDef* optimized_graph) override; 37 38 void Feedback(Cluster* cluster, const GrapplerItem& item, 39 const GraphDef& optimized_graph, double result) override; 40 41 private: 42 friend class FunctionOptimizerTest; 43 44 struct FunctionOptimizerOptions { 45 bool enable_function_inlining = true; 46 bool enable_function_specialization = true; 47 bool enable_symbolic_gradient_inlining = true; 48 bool enable_trim_function_library = true; 49 }; 50 51 // Runs a single function optimizer pass over the `graph`. All nodes that are 52 // not function calls will be copied from the `graph` to the 53 // `optimized_graph`. Function call nodes inlined or specialized, and 54 // instantiated function body or specialized function call nodes will be added 55 // to the `optimized_graph`. 56 Status RunFunctionOptimizerPass( 57 const GrapplerItem& item, const GraphDef& graph, const int iteration, 58 std::unordered_set<string>* skip_nodes, GraphDef* optimized_graph, 59 bool* graph_has_unoptimized_function_calls) const; 60 61 RewriterConfig::Toggle opt_level_; 62 FunctionOptimizerOptions options_; 63 }; 64 65 } // end namespace grappler 66 } // end namespace tensorflow 67 68 #endif // TENSORFLOW_CORE_GRAPPLER_OPTIMIZERS_FUNCTION_OPTIMIZER_H_ 69