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Java example source code file (GraphVertex.java)

This example Java source code file (GraphVertex.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

cloneable, elementwisevertex, graphvertex, indarray, invalidinputtypeexception, jsonsubtypes, jsontypeinfo, lasttimestepvertex, layervertex, mergevertex, override, preprocessorvertex, string, subsetvertex

The GraphVertex.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.conf.graph;

import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import org.deeplearning4j.nn.conf.graph.rnn.DuplicateToTimeSeriesVertex;
import org.deeplearning4j.nn.conf.graph.rnn.LastTimeStepVertex;
import org.deeplearning4j.nn.conf.inputs.InputType;
import org.deeplearning4j.nn.conf.inputs.InvalidInputTypeException;
import org.deeplearning4j.nn.graph.ComputationGraph;
import org.nd4j.linalg.api.ndarray.INDArray;

import java.io.Serializable;

/**
 * A GraphVertex is a vertex in the computation graph. It may contain Layer, or define some arbitrary forward/backward pass
 * behaviour based on the inputs
 *
 * @author Alex Black
 */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.WRAPPER_OBJECT)
@JsonSubTypes(value = {
        @JsonSubTypes.Type(value = ElementWiseVertex.class, name = "ElementWiseVertex"),
        @JsonSubTypes.Type(value = MergeVertex.class, name = "MergeVertex"),
        @JsonSubTypes.Type(value = SubsetVertex.class, name = "SubsetVertex"),
        @JsonSubTypes.Type(value = LayerVertex.class, name = "LayerVertex"),
        @JsonSubTypes.Type(value = LastTimeStepVertex.class, name = "LastTimeStepVertex"),
        @JsonSubTypes.Type(value = DuplicateToTimeSeriesVertex.class, name = "DuplicateToTimeSeriesVertex"),
        @JsonSubTypes.Type(value = PreprocessorVertex.class, name = "PreprocessorVertex")
})
public abstract class GraphVertex implements Cloneable, Serializable {

    @Override
    public abstract GraphVertex clone();

    @Override
    public abstract boolean equals(Object o);

    @Override
    public abstract int hashCode();

    public abstract int numParams(boolean backprop);

    /**
     * Create a {@link org.deeplearning4j.nn.graph.vertex.GraphVertex} instance, for the given computation graph,
     * given the configuration instance.
     *
     * @param graph            The computation graph that this GraphVertex is to be part of
     * @param name             The name of the GraphVertex object
     * @param idx              The index of the GraphVertex
     * @param paramsView       A view of the full parameters array
     * @param initializeParams If true: initialize the parameters. If false: make no change to the values in the paramsView array
     * @return The implementation GraphVertex object (i.e., implementation, no the configuration)
     */
    public abstract org.deeplearning4j.nn.graph.vertex.GraphVertex instantiate(ComputationGraph graph, String name, int idx,
                                                                               INDArray paramsView, boolean initializeParams);

    /**
     * Determine the type of output for this GraphVertex, given the specified inputs. Given that a GraphVertex may do arbitrary
     * processing or modifications of the inputs, the output types can be quite different to the input type(s).<br>
     * This is generally used to determine when to add preprocessors, as well as the input sizes etc for layers
     *
     * @param vertexInputs The inputs to this vertex
     * @return The type of output for this vertex
     * @throws InvalidInputTypeException If the input type is invalid for this type of GraphVertex
     */
    public abstract InputType getOutputType(InputType... vertexInputs) throws InvalidInputTypeException;

}

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