Please wait. This can take some minutes ...
Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $
You can buy this project and download/modify it how often you want.
org.nd4j.linalg.api.ops.impl.transforms.Stabilize 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.apache.commons.math3.util.FastMath;
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;
/**
* Stabilization function, forces values to be within a range
*
* @author Adam Gibson
*/
public class Stabilize extends BaseTransformOp {
double realMin = 1.1755e-38f;
double cutOff = FastMath.log(realMin);
double k;
public Stabilize() {}
public Stabilize(INDArray x, INDArray z, double k) {
super(x, z);
this.k = k;
}
public Stabilize(INDArray x, INDArray z, long n, double k) {
super(x, z, n);
this.k = k;
}
public Stabilize(INDArray x, INDArray y, INDArray z, long n, double k) {
super(x, y, z, n);
this.k = k;
}
public Stabilize(INDArray x, double k) {
super(x);
this.k = k;
}
@Override
public int opNum() {
return 28;
}
@Override
public String name() {
return "stabilize";
}
@Override
public IComplexNumber op(IComplexNumber origin, double other) {
return stabilize(origin);
}
@Override
public IComplexNumber op(IComplexNumber origin, float other) {
return stabilize(origin);
}
@Override
public IComplexNumber op(IComplexNumber origin, IComplexNumber other) {
return stabilize(origin);
}
@Override
public float op(float origin, float other) {
return stabilize(origin);
}
private float stabilize(float curr) {
if (curr * k > -cutOff)
return (float) (-cutOff / k);
else if (curr * k < cutOff)
return (float) (cutOff / k);
return curr;
}
private double stabilize(double curr) {
if (curr * k > -cutOff)
return (float) (-cutOff / k);
else if (curr * k < cutOff)
return (float) (cutOff / k);
return curr;
}
@Override
public double op(double origin, double other) {
return stabilize(origin);
}
@Override
public double op(double origin) {
return stabilize(origin);
}
@Override
public float op(float origin) {
return stabilize(origin);
}
@Override
public IComplexNumber op(IComplexNumber origin) {
return stabilize(origin);
}
private IComplexNumber stabilize(IComplexNumber c) {
double realMin = 1.1755e-38f;
double cutOff = FastMath.log(realMin);
double curr = c.realComponent().doubleValue();
if (curr * k > -cutOff)
return Nd4j.createDouble(-cutOff / k, c.imaginaryComponent().doubleValue());
else if (curr * k < cutOff)
return Nd4j.createDouble(cutOff / k, c.imaginaryComponent().doubleValue());
return c;
}
@Override
public void init(INDArray x, INDArray y, INDArray z, long n) {
super.init(x, y, z, n);
this.extraArgs = new Object[] {k};
}
@Override
public Op opForDimension(int index, int dimension) {
INDArray xAlongDimension = x.vectorAlongDimension(index, dimension);
if (y() != null)
return new Stabilize(xAlongDimension, y.vectorAlongDimension(index, dimension),
z.vectorAlongDimension(index, dimension), xAlongDimension.length(), k);
else
return new Stabilize(xAlongDimension, z.vectorAlongDimension(index, dimension), xAlongDimension.length(),
k);
}
@Override
public Op opForDimension(int index, int... dimension) {
INDArray xAlongDimension = x.tensorAlongDimension(index, dimension);
if (y() != null)
return new Stabilize(xAlongDimension, y.tensorAlongDimension(index, dimension),
z.tensorAlongDimension(index, dimension), xAlongDimension.length(), k);
else
return new Stabilize(xAlongDimension, z.tensorAlongDimension(index, dimension), xAlongDimension.length(),
k);
}
}