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Java example source code file (InputVertex.java)

This example Java source code file (InputVertex.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, cannot, indarray, inputvertex, layer, override, pair, runtimeexception, string, unsupportedoperationexception, vertexindices

The InputVertex.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.impl;

import org.deeplearning4j.berkeley.Pair;
import org.deeplearning4j.nn.api.Layer;
import org.deeplearning4j.nn.gradient.Gradient;
import org.deeplearning4j.nn.graph.ComputationGraph;
import org.deeplearning4j.nn.graph.vertex.BaseGraphVertex;
import org.deeplearning4j.nn.graph.vertex.VertexIndices;
import org.nd4j.linalg.api.ndarray.INDArray;

/** An InputVertex simply defines the location (and connection structure) of inputs to the ComputationGraph.
 * It does not define forward or backward methods.
 */
public class InputVertex extends BaseGraphVertex {


    public InputVertex(ComputationGraph graph, String name, int vertexIndex, VertexIndices[] outputVertices) {
        super(graph, name, vertexIndex, null, outputVertices);
    }

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

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

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

    @Override
    public Layer getLayer() {
        return null;
    }

    @Override
    public INDArray doForward(boolean training) {
        throw new UnsupportedOperationException("Cannot do forward pass for InputVertex");
    }

    @Override
    public Pair<Gradient, INDArray[]> doBackward(boolean tbptt) {
        throw new UnsupportedOperationException("Cannot do backward pass for InputVertex");
    }

    @Override
    public void setBackpropGradientsViewArray(INDArray backpropGradientsViewArray) {
        if(backpropGradientsViewArray != null) throw new RuntimeException("Vertex does not have gradients; gradients view array cannot be set here");
    }

    @Override
    public String toString(){
        return "InputVertex(id="+vertexIndex+",name=\""+vertexName+"\")";
    }
}

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