org.nd4j.weightinit.impl.SigmoidUniformInitScheme Maven / Gradle / Ivy
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 = 4.0 * Math.sqrt(6.0 / (fanIn + fanOut))
* U(-range,range)
* @author Adam Gibson
*/
public class SigmoidUniformInitScheme extends BaseWeightInitScheme {
private double fanIn;
private double fanOut;
@Builder
public SigmoidUniformInitScheme(char order, double fanIn,double fanOut) {
super(order);
this.fanIn = fanIn;
this.fanOut = fanOut;
}
@Override
public INDArray doCreate(int[] shape, INDArray paramsView) {
double r = 4.0 * Math.sqrt(6.0 / (fanIn + fanOut));
return Nd4j.rand(shape, Nd4j.getDistributions().createUniform(-r, r));
}
@Override
public WeightInit type() {
return WeightInit.SIGMOID_UNIFORM;
}
}