content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. 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
   *
   * https://opensource.org/licenses/Apache-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.
   *
   */
  package com.tencent.angel.sona.tree.gbdt.tree;
  
  import com.tencent.angel.sona.tree.gbdt.histogram.GradPair;
  import com.tencent.angel.sona.tree.regression.RegTNode;
  
  public class GBTNode extends RegTNode {
      private GradPair sumGradPair;
  
      public GBTNode(int nid, GBTNode parent, GBTNode leftChild, GBTNode rightChild) {
          super(nid, parent, leftChild, rightChild);
      }
  
      public GBTNode(int nid, GBTNode parent) {
          this(nid, parent, null, null);
      }
  
      public void setSumGradPair(GradPair sumGradPair) {
          this.sumGradPair = sumGradPair;
      }
  
      public float calcGain(GBDTParam param) {
          gain = sumGradPair.calcGain(param);
          return gain;
      }
  
      public float calcWeight(GBDTParam param) {
          if (weights == null)
              weights = new float[1];
          weights[0] = sumGradPair.calcWeight(param);
          return weights[0];
      }
  
      public float[] calcWeights(GBDTParam param) {
          weights = sumGradPair.calcWeights(param);
          return weights;
      }
  
      public GradPair getSumGradPair() {
          return sumGradPair;
      }
  }
  
  