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.histogram;
  
  import com.tencent.angel.sona.tree.gbdt.tree.GBDTParam;
  
  public interface GradPair {
      void plusBy(GradPair gradPair);
  
      void subtractBy(GradPair gradPair);
  
      GradPair plus(GradPair gradPair);
  
      GradPair subtract(GradPair gradPair);
  
      void timesBy(double x);
  
      boolean satisfyWeight(GBDTParam param);
  
      float calcGain(GBDTParam param);
  
      public float calcWeight(GBDTParam param);
  
      public float[] calcWeights(GBDTParam param);
  
      GradPair copy();
  
      void clear();
  }
  