org.nd4j.linalg.activations.impl.ActivationSwish Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of nd4j-api Show documentation

There is a newer version: 1.0.0-M2.1

package org.nd4j.linalg.activations.impl;

import lombok.EqualsAndHashCode;
import lombok.Getter;
import org.nd4j.linalg.activations.BaseActivationFunction;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.impl.transforms.Sigmoid;
import org.nd4j.linalg.api.ops.impl.transforms.SigmoidDerivative;
import org.nd4j.linalg.api.ops.impl.transforms.Swish;
import org.nd4j.linalg.api.ops.impl.transforms.SwishDerivative;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.primitives.Pair;

/**
 * f(x) = x * sigmoid(x)
 */
@EqualsAndHashCode
@Getter
public class ActivationSwish extends BaseActivationFunction {

    @Override
    public INDArray getActivation(INDArray in, boolean training) {
        Nd4j.getExecutioner().execAndReturn(new Swish(in));
        return in;
    }

    @Override
    public Pair backprop(INDArray in, INDArray epsilon) {
        INDArray dLdz = Nd4j.getExecutioner().execAndReturn(new SwishDerivative(in));
        dLdz.muli(epsilon);
        return new Pair<>(dLdz, null);
    }

    @Override
    public String toString() {
        return "swish";
    }

}