/**
* 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;
import java.io.Serializable;
/**
* Weighted connection to another neuron.
*
* @see Weight
* @see Neuron
* @author Zoran Sevarac <sevarac@gmail.com>
*/
public class Connection 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;
/**
* From neuron for this connection (source neuron).
* This connection is output connection for from neuron.
*/
protected Neuron fromNeuron;
/**
* To neuron for this connection (target, destination neuron)
* This connection is input connection for to neuron.
*/
protected Neuron toNeuron;
/**
* Weight for this connection
*/
protected Weight weight;
/**
* Creates a new connection between specified neurons with random weight
*
* @param fromNeuron neuron to connect from
* @param toNeuron neuron to connect to
*/
public Connection(Neuron fromNeuron, Neuron toNeuron) {
this.fromNeuron = fromNeuron;
this.toNeuron = toNeuron;
this.weight = new Weight();
}
/**
* Creates a new connection to specified neuron with specified weight object
*
* @param fromNeuron neuron to connect from
* @param toNeuron neuron to connect to
* @param weight
* weight for this connection
*/
public Connection(Neuron fromNeuron, Neuron toNeuron, Weight weight) {
this.fromNeuron = fromNeuron;
this.toNeuron = toNeuron;
this.weight = weight;
}
/**
* Creates a new connection to specified neuron with specified weight value
*
* @param fromNeuron neuron to connect from
* @param toNeuron neuron to connect to
* @param weightVal
* weight value for this connection
*/
public Connection(Neuron fromNeuron, Neuron toNeuron, double weightVal) {
this.fromNeuron = fromNeuron;
this.toNeuron = toNeuron;
this.weight = new Weight(weightVal);
}
/**
* Returns weight for this connection
*
* @return weight for this connection
*/
public Weight getWeight() {
return this.weight;
}
/**
* Set the weight of the connection.
* @param weight The new weight of the connection.
*/
public void setWeight(Weight weight) {
this.weight = weight;
}
/**
* Returns input received through this connection - the activation that
* comes from the output of the cell on the other end of connection
*
* @return input received through this connection
*/
public double getInput() {
return this.fromNeuron.getOutput();
}
/**
* Returns the weighted input received through this connection
*
* @return weighted input received through this connection
*/
public double getWeightedInput() {
return this.fromNeuron.getOutput() * weight.getValue();
}
/**
* Gets from neuron for this connection
* @return from neuron for this connection
*/
public Neuron getFromNeuron() {
return fromNeuron;
}
/**
* Sets from neuron for this connection
* @param fromNeuron neuron to set as from neuron
*/
public void setFromNeuron(Neuron fromNeuron) {
this.fromNeuron = fromNeuron;
}
/**
* Gets to neuron for this connection
* @return neuron to set as to neuron
*/
public Neuron getToNeuron() {
return toNeuron;
}
/**
* Sets to neuron for this connection
* @param toNeuron
*/
public void setToNeuron(Neuron toNeuron) {
this.toNeuron = toNeuron;
}
}