org.deeplearning4j.nn.graph.vertex.impl.InputVertex Maven / Gradle / Ivy

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 *  * This program and the accompanying materials are made available under the
 *  * terms of the Apache License, Version 2.0 which is available at
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 *  *  information regarding copyright ownership.
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 *  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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package org.deeplearning4j.nn.graph.vertex.impl;

import org.deeplearning4j.nn.api.Layer;
import org.deeplearning4j.nn.api.MaskState;
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.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.common.primitives.Pair;
import org.deeplearning4j.nn.workspace.LayerWorkspaceMgr;

public class InputVertex extends BaseGraphVertex {


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

    @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, LayerWorkspaceMgr workspaceMgr) {
        throw new UnsupportedOperationException("Cannot do forward pass for InputVertex");
    }

    @Override
    public Pair doBackward(boolean tbptt, LayerWorkspaceMgr workspaceMgr) {
        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 Pair feedForwardMaskArrays(INDArray[] maskArrays, MaskState currentMaskState,
                    int minibatchSize) {
        //No op
        if (maskArrays == null || maskArrays.length == 0) {
            return null;
        }

        return new Pair<>(maskArrays[0], currentMaskState);
    }

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