/**
* Copyright 2010 Neuroph Project http://neuroph.sourceforge.net
*
* 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.neuroph.core.transfer;
import java.io.Serializable;
import java.util.Properties;
import org.neuroph.util.TransferFunctionType;
/**
* Sgn neuron transfer function.
*
* @author Zoran Sevarac <sevarac@gmail.com>
*/
public class Sgn extends TransferFunction implements Serializable {
/**
* The class fingerprint that is set to indicate serialization
* compatibility with a previous version of the class.
*/
private static final long serialVersionUID = 1L;
/**
* y = 1, x > 0
* y = -1, x <= 0
*/
public double getOutput(double net) {
if (net > 0d)
return 1d;
else
return -1d;
}
/**
* Returns the properties of this function
* @return properties of this function
*/
public Properties getProperties() {
Properties properties = new java.util.Properties();
properties.setProperty("transferFunction", TransferFunctionType.SGN.toString());
return properties;
}
}