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Java example source code file (BaseGraphVertex.java)

This example Java source code file (BaseGraphVertex.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basegraphvertex, computationgraph, data, illegalargumentexception, indarray, invalid, override, string, util, vertexindices

The BaseGraphVertex.java Java example source code

/*
 *
 *  * Copyright 2016 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.deeplearning4j.nn.graph.vertex;

import lombok.Data;
import org.deeplearning4j.nn.graph.ComputationGraph;
import org.nd4j.linalg.api.ndarray.INDArray;

import java.io.Serializable;
import java.util.Arrays;

/** BaseGraphVertex defines a set of common functionality for GraphVertex instances.
 */
@Data
public abstract class BaseGraphVertex implements GraphVertex {

    protected ComputationGraph graph;

    protected String vertexName;

    /** The index of this vertex */
    protected int vertexIndex;

    /**A representation of the vertices that are inputs to this vertex (inputs during forward pass)
     * Specifically, if inputVertices[X].getVertexIndex() = Y, and inputVertices[X].getVertexEdgeNumber() = Z
     * then the Zth output of vertex Y is the Xth input to this vertex
     */
    protected VertexIndices[] inputVertices;

    /**A representation of the vertices that this vertex is connected to (outputs duing forward pass)
     * Specifically, if outputVertices[X].getVertexIndex() = Y, and outputVertices[X].getVertexEdgeNumber() = Z
     * then the output of this vertex (there is only one output) is connected to the Zth input of vertex Y
     */
    protected VertexIndices[] outputVertices;

    protected INDArray[] inputs;
    protected INDArray[] epsilons;

    protected BaseGraphVertex(ComputationGraph graph, String name, int vertexIndex, VertexIndices[] inputVertices, VertexIndices[] outputVertices){
        this.graph = graph;
        this.vertexName = name;
        this.vertexIndex = vertexIndex;
        this.inputVertices = inputVertices;
        this.outputVertices = outputVertices;

        this.inputs = new INDArray[(inputVertices != null ? inputVertices.length : 0)];
        this.epsilons = new INDArray[(outputVertices != null ? outputVertices.length : 0)];
    }

    @Override
    public String getVertexName(){
        return vertexName;
    }

    @Override
    public int getVertexIndex(){
        return vertexIndex;
    }

    @Override
    public int getNumInputArrays(){
        return (inputVertices == null ? 0 : inputVertices.length);
    }

    @Override
    public int getNumOutputConnections(){
        return (outputVertices == null ? 0 : outputVertices.length);
    }

    /**A representation of the vertices that are inputs to this vertex (inputs duing forward pass)<br>
     * Specifically, if inputVertices[X].getVertexIndex() = Y, and inputVertices[X].getVertexEdgeNumber() = Z
     * then the Zth output of vertex Y is the Xth input to this vertex
     */
    @Override
    public VertexIndices[] getInputVertices(){
        return inputVertices;
    }

    @Override
    public void setInputVertices(VertexIndices[] inputVertices){
        this.inputVertices = inputVertices;
        this.inputs = new INDArray[(inputVertices != null ? inputVertices.length : 0)];
    }

    /**A representation of the vertices that this vertex is connected to (outputs duing forward pass)
     * Specifically, if outputVertices[X].getVertexIndex() = Y, and outputVertices[X].getVertexEdgeNumber() = Z
     * then the Xth output of this vertex is connected to the Zth input of vertex Y
     */
    @Override
    public VertexIndices[] getOutputVertices(){
        return outputVertices;
    }

    @Override
    public void setOutputVertices(VertexIndices[] outputVertices){
        this.outputVertices = outputVertices;
        this.epsilons = new INDArray[(outputVertices != null ? outputVertices.length : 0)];
    }

    @Override
    public boolean isInputVertex(){
        return false;
    }

    @Override
    public void setInput(int inputNumber, INDArray input){
        if(inputNumber >= getNumInputArrays()) throw new IllegalArgumentException("Invalid input number");
        inputs[inputNumber] = input;
    }

    @Override
    public void setError(int errorNumber, INDArray error){
        if(errorNumber >= getNumOutputConnections() ){
            throw new IllegalArgumentException("Invalid error number: " + errorNumber
                    + ", numOutputEdges = " + (outputVertices != null ? outputVertices.length : 0) );
        }
        epsilons[errorNumber] = error;
    }

    @Override
    public void clear(){
        for (int i = 0; i < inputs.length; i++) inputs[i] = null;
        for (int i = 0; i < epsilons.length; i++) epsilons[i] = null;
    }

    @Override
    public boolean canDoForward(){
        for (INDArray input : inputs) if (input == null) return false;
        return true;
    }

    @Override
    public boolean canDoBackward(){
        for (INDArray input : inputs) if (input == null) return false;
        for (INDArray epsilon : epsilons) if (epsilon == null) return false;
        return true;
    }

    @Override
    public INDArray[] getErrors(){
        return epsilons;
    }

    @Override
    public void setErrors(INDArray... errors){
        this.epsilons = errors;
    }

    @Override
    public abstract String toString();
}

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