1 // Copyright 2017 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_CONTRIB_BOOSTED_TREES_LIB_TREES_DECISION_TREE_H_ 16 #define TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_TREES_DECISION_TREE_H_ 17 18 #include "tensorflow/contrib/boosted_trees/lib/utils/example.h" 19 #include "tensorflow/contrib/boosted_trees/proto/tree_config.pb.h" // NOLINT 20 21 namespace tensorflow { 22 namespace boosted_trees { 23 namespace trees { 24 25 // Decision tree class to encapsulate tree traversal and mutation logic. 26 // This class does not hold state and is thread safe. 27 class DecisionTree { 28 public: 29 // Traverse given an instance, a sub-root and its set of features 30 // and return the leaf index or -1 if the tree is empty or 31 // the sub-root is invalid. 32 static int Traverse(const DecisionTreeConfig& config, int32 sub_root_id, 33 const utils::Example& example); 34 35 // Links the specified children to the parent, the children must 36 // already be added to the decision tree config so this method 37 // just ensures nodes are re-linked. 38 static void LinkChildren(const std::vector<int32>& children, 39 TreeNode* parent_node); 40 41 // Retrieves node children indices if any. 42 static std::vector<int32> GetChildren(const TreeNode& node); 43 }; 44 45 } // namespace trees 46 } // namespace boosted_trees 47 } // namespace tensorflow 48 49 #endif // TENSORFLOW_CONTRIB_BOOSTED_TREES_LIB_TREES_DECISION_TREE_H_ 50