org.nd4j.linalg.activations.impl.ActivationHardSigmoid Maven / Gradle / Ivy
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* *
* * 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.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
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* * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* * SPDX-License-Identifier: Apache-2.0
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*/
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.gradient.HardSigmoidBp;
import org.nd4j.linalg.api.ops.impl.transforms.strict.HardSigmoid;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.common.primitives.Pair;
/**
* f(x) = min(1, max(0, 0.2*x + 0.5))
*/
@EqualsAndHashCode(callSuper = false)
@Getter
public class ActivationHardSigmoid extends BaseActivationFunction {
@Override
public INDArray getActivation(INDArray in, boolean training) {
Nd4j.getExecutioner().execAndReturn(new HardSigmoid(in));
return in;
}
@Override
public Pair backprop(INDArray in, INDArray epsilon) {
assertShape(in, epsilon);
Nd4j.getExecutioner().execAndReturn(new HardSigmoidBp(in, epsilon, in));
return new Pair<>(in, null);
}
@Override
public String toString() {
return "hardsigmoid";
}
}