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org.nd4j.linalg.api.ops.impl.transforms.Step Maven / Gradle / Ivy
/*-
*
* * Copyright 2015 Skymind,Inc.
* *
* * 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
* *
* * http://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.
*
*
*/
package org.nd4j.linalg.api.ops.impl.transforms;
import org.nd4j.linalg.api.complex.IComplexNumber;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.BaseTransformOp;
import org.nd4j.linalg.api.ops.Op;
import org.nd4j.linalg.factory.Nd4j;
/**
* Unit step function.
* f(x) = 1 if x > cutoff; 0 otherwise
* cutoff = 0.0 usually.
*/
public class Step extends BaseTransformOp {
private final double cutoff;
public Step() {
cutoff = 0.0;
}
public Step(INDArray x, INDArray z) {
super(x, z);
cutoff = 0.0;
}
public Step(INDArray x, INDArray z, long n) {
super(x, z, n);
cutoff = 0.0;
}
public Step(INDArray x, INDArray y, INDArray z, long n) {
super(x, y, z, n);
cutoff = 0.0;
}
public Step(INDArray x) {
super(x);
cutoff = 0.0;
}
public Step(INDArray x, INDArray z, double cutoff) {
super(x, z);
this.cutoff = cutoff;
}
public Step(INDArray x, INDArray z, long n, double cutoff) {
super(x, z, n);
this.cutoff = cutoff;
}
public Step(INDArray x, INDArray y, INDArray z, long n, double cutoff) {
super(x, y, z, n);
this.cutoff = cutoff;
}
public Step(INDArray x, double cutoff) {
super(x);
this.cutoff = cutoff;
}
@Override
public int opNum() {
return 34;
}
@Override
public String name() {
return "step";
}
@Override
public IComplexNumber op(IComplexNumber origin, double other) {
return (origin.realComponent().doubleValue() > cutoff ? Nd4j.createDouble(1, 0) : Nd4j.createDouble(0, 0));
}
@Override
public IComplexNumber op(IComplexNumber origin, float other) {
return (origin.realComponent().doubleValue() > cutoff ? Nd4j.createDouble(1, 0) : Nd4j.createDouble(0, 0));
}
@Override
public IComplexNumber op(IComplexNumber origin, IComplexNumber other) {
return (origin.realComponent().doubleValue() > cutoff ? Nd4j.createDouble(1, 0) : Nd4j.createDouble(0, 0));
}
@Override
public float op(float origin, float other) {
return (origin > cutoff ? 1.0f : 0.0f);
}
@Override
public double op(double origin, double other) {
return (origin > cutoff ? 1.0 : 0.0);
}
@Override
public double op(double origin) {
return (origin > cutoff ? 1.0 : 0.0);
}
@Override
public float op(float origin) {
return (origin > cutoff ? 1.0f : 0.0f);
}
@Override
public IComplexNumber op(IComplexNumber origin) {
return (origin.realComponent().doubleValue() > cutoff ? Nd4j.createDouble(1, 0) : Nd4j.createDouble(0, 0));
}
@Override
public Op opForDimension(int index, int dimension) {
INDArray xAlongDimension = x.vectorAlongDimension(index, dimension);
if (y() != null)
return new Step(x.vectorAlongDimension(index, dimension), y.vectorAlongDimension(index, dimension),
z.vectorAlongDimension(index, dimension), xAlongDimension.length(), cutoff);
else
return new Step(x.vectorAlongDimension(index, dimension), z.vectorAlongDimension(index, dimension),
xAlongDimension.length(), cutoff);
}
@Override
public Op opForDimension(int index, int... dimension) {
INDArray xAlongDimension = x.tensorAlongDimension(index, dimension);
if (y() != null)
return new Step(x.tensorAlongDimension(index, dimension), y.tensorAlongDimension(index, dimension),
z.tensorAlongDimension(index, dimension), xAlongDimension.length(), cutoff);
else
return new Step(x.tensorAlongDimension(index, dimension), z.tensorAlongDimension(index, dimension),
xAlongDimension.length(), cutoff);
}
@Override
public void init(INDArray x, INDArray y, INDArray z, long n) {
super.init(x, y, z, n);
this.extraArgs = new Object[] {cutoff};
}
}