| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.horn.core; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hama.commons.math.DoubleFunction; |
| |
| public abstract class Neuron<M extends Writable> implements Writable, NeuronInterface<M> { |
| double output; |
| double weight; |
| double delta; |
| |
| double momentumWeight; |
| double learningRate; |
| |
| protected DoubleFunction squashingFunction; |
| |
| public void feedforward(double sum) { |
| this.output = sum; |
| } |
| |
| public void backpropagate(double gradient) { |
| this.delta = gradient; |
| } |
| |
| public double getDelta() { |
| return delta; |
| } |
| |
| public void setWeight(double weight) { |
| this.weight = weight; |
| } |
| |
| public void setOutput(double output) { |
| this.output = output; |
| } |
| |
| public double getOutput() { |
| return output; |
| } |
| |
| public void setMomentumWeight(double momentumWeight) { |
| this.momentumWeight = momentumWeight; |
| } |
| |
| public double getMomentumWeight() { |
| return momentumWeight; |
| } |
| |
| public void setLearningRate(double learningRate) { |
| this.learningRate = learningRate; |
| } |
| |
| public double getLearningRate() { |
| return learningRate; |
| } |
| |
| // //////// |
| |
| private int i; |
| |
| public void push(double weight) { |
| weights[i++] = weight; |
| } |
| |
| public double getUpdate() { |
| return weight; |
| } |
| |
| double[] weights; |
| |
| public void setWeightVector(int rowCount) { |
| i = 0; |
| weights = new double[rowCount]; |
| } |
| |
| public double[] getWeights() { |
| return weights; |
| } |
| |
| public void setSquashingFunction(DoubleFunction squashingFunction) { |
| this.squashingFunction = squashingFunction; |
| } |
| |
| @Override |
| public void readFields(DataInput in) throws IOException { |
| output = in.readDouble(); |
| weight = in.readDouble(); |
| delta = in.readDouble(); |
| |
| momentumWeight = in.readDouble(); |
| learningRate = in.readDouble(); |
| } |
| |
| @Override |
| public void write(DataOutput out) throws IOException { |
| out.writeDouble(output); |
| out.writeDouble(weight); |
| out.writeDouble(delta); |
| |
| out.writeDouble(momentumWeight); |
| out.writeDouble(learningRate); |
| } |
| |
| } |