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.regression;
  
  import com.tencent.angel.sona.tree.basic.TParam;
  
  public class RegTParam extends TParam {
      public boolean leafwise = DEFAULT_LEAFWISE;
      public float minSplitGain = DEFAULT_MIN_SPLIT_GAIN;
      public int minNodeInstance = DEFAULT_MIN_NODE_INSTANCE;
  
      public RegTParam setLeafwise(boolean leafwise) {
          this.leafwise = leafwise;
          return this;
      }
  
      public RegTParam setMinSplitGain(float minSplitGain) {
          this.minSplitGain = minSplitGain;
          return this;
      }
  
      public RegTParam setMinNodeInstance(int minNodeInstance) {
          this.minNodeInstance = minNodeInstance;
          return this;
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder(super.toString());
          sb.append(String.format("|leafwise = %s\n", leafwise));
          sb.append(String.format("|minSplitGain = %f\n", minSplitGain));
          sb.append(String.format("|minNodeInstance = %d\n", minNodeInstance));
          return sb.toString();
      }
  
      /** -------------------- Default hyper-parameters -------------------- */
      public static final boolean DEFAULT_LEAFWISE = false;
      public static final float DEFAULT_MIN_SPLIT_GAIN = 0.0f;
      public static final int DEFAULT_MIN_NODE_INSTANCE = 1024;
  }
  