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Java example source code file (PreprocessorVertex.java)

This example Java source code file (PreprocessorVertex.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, indarray, inputpreprocessor, layer, override, pair, preprocessorvertex, runtimeexception, string, vertexindices

The PreprocessorVertex.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.conf.InputPreProcessor;
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;

/** PreprocessorVertex is a simple adaptor class that allows a {@link InputPreProcessor} to be used in a ComputationGraph
 * GraphVertex, without it being associated with a layer.
 * @author Alex Black
 */
public class PreprocessorVertex extends BaseGraphVertex {

    private InputPreProcessor preProcessor;

    public PreprocessorVertex(ComputationGraph graph, String name, int vertexIndex, InputPreProcessor preProcessor) {
        this(graph, name, vertexIndex, null, null, preProcessor);
    }

    public PreprocessorVertex(ComputationGraph graph, String name, int vertexIndex, VertexIndices[] inputVertices,
                                 VertexIndices[] outputVertices, InputPreProcessor preProcessor) {
        super(graph, name, vertexIndex, inputVertices, outputVertices);
        this.preProcessor = preProcessor;
    }

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

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

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

    @Override
    public INDArray doForward(boolean training) {
        return preProcessor.preProcess(inputs[0],graph.batchSize());
    }

    @Override
    public Pair<Gradient, INDArray[]> doBackward(boolean tbptt) {
        return new Pair<>(null,new INDArray[]{preProcessor.backprop(epsilons[0],graph.batchSize())});
    }

    @Override
    public String toString() {
        return "PreprocessorVertex(id=" + this.getVertexIndex() + ",name=\"" + this.getVertexName() + "\",preProcessor=" + preProcessor.toString() + ")";
    }

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

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