org.nd4j.weightinit.impl.VarScalingUniformFanAvgInitScheme Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.weightinit.impl;
import lombok.Builder;
import org.apache.commons.math3.util.FastMath;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.weightinit.BaseWeightInitScheme;
import org.nd4j.weightinit.WeightInit;
/**
* Initialize the weight to:
* range = = 3.0 / Math.sqrt((fanIn + fanOut) / 2)
* U(-range,range)
* @author Adam Gibson
*/
public class VarScalingUniformFanAvgInitScheme extends BaseWeightInitScheme {
private double fanIn;
private double fanOut;
@Builder
public VarScalingUniformFanAvgInitScheme(char order, double fanIn, double fanOut) {
super(order);
this.fanIn = fanIn;
this.fanOut = fanOut;
}
@Override
public INDArray doCreate(long[] shape, INDArray paramsView) {
double scalingFanAvg = 3.0 / Math.sqrt((fanIn + fanOut) / 2);
return Nd4j.rand(shape, Nd4j.getDistributions().createUniform(-scalingFanAvg, scalingFanAvg));
}
@Override
public WeightInit type() {
return WeightInit.VAR_SCALING_UNIFORM_FAN_AVG;
}
}