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.ps.server.data.request;
  
  import io.netty.buffer.ByteBuf;
  
  import java.util.Random;
  
  public class RandomNormalInitFunc implements InitFunc {
    private double mean;
    private double stdDev;
    private Random rand = new Random(System.currentTimeMillis());
  
    public RandomNormalInitFunc(double mean, double stdDev) {
      this.mean = mean;
      this.stdDev = stdDev;
    }
  
    public RandomNormalInitFunc() {
      this(0.0, 0.0);
    }
  
    @Override
    public double action() {
      return stdDev * rand.nextGaussian() + mean;
    }
  
    @Override public void serialize(ByteBuf buf) {
      buf.writeDouble(mean);
      buf.writeDouble(stdDev);
    }
  
    @Override public void deserialize(ByteBuf buf) {
      this.mean = buf.readDouble();
      this.stdDev = buf.readDouble();
    }
  
    @Override public int bufferLen() {
      return 16;
    }
  }
  