home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ComputationGraphUtil.java)

This example Java source code file (ComputationGraphUtil.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

computationgraphutil, indarray, multidataset, multidatasetiteratoradaptor, multidatasetpreprocessor, override, unsupportedoperationexception

The ComputationGraphUtil.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.util;

import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.dataset.api.DataSet;
import org.nd4j.linalg.dataset.api.MultiDataSet;
import org.nd4j.linalg.dataset.api.MultiDataSetPreProcessor;
import org.nd4j.linalg.dataset.api.iterator.MultiDataSetIterator;

public class ComputationGraphUtil {

    /** Convert a DataSet to the equivalent MultiDataSet */
    public static MultiDataSet toMultiDataSet(DataSet dataSet){
        INDArray f = dataSet.getFeatureMatrix();
        INDArray l = dataSet.getLabels();
        INDArray fMask = dataSet.getFeaturesMaskArray();
        INDArray lMask = dataSet.getLabelsMaskArray();

        INDArray[] fNew = new INDArray[]{f};
        INDArray[] lNew = new INDArray[]{l};
        INDArray[] fMaskNew = (fMask != null ? new INDArray[]{fMask} : null);
        INDArray[] lMaskNew = (lMask != null ? new INDArray[]{lMask} : null);

        return new org.nd4j.linalg.dataset.MultiDataSet(fNew,lNew,fMaskNew,lMaskNew);

    /** Convert a DataSetIterator to a MultiDataSetIterator, via an adaptor class */
    public static MultiDataSetIterator toMultiDataSetIterator(DataSetIterator iterator){
        return new MultiDataSetIteratorAdaptor(iterator);

    private static class MultiDataSetIteratorAdaptor implements MultiDataSetIterator {

        private DataSetIterator iter;
        private MultiDataSetPreProcessor preProcessor;

        public MultiDataSetIteratorAdaptor(DataSetIterator iter) {
            this.iter = iter;

        public MultiDataSet next(int i) {
            MultiDataSet mds = toMultiDataSet(iter.next(i));
            if(preProcessor != null) preProcessor.preProcess(mds);
            return mds;

        public void setPreProcessor(MultiDataSetPreProcessor multiDataSetPreProcessor) {
            this.preProcessor = multiDataSetPreProcessor;

        public void reset() {

        public boolean hasNext() {
            return iter.hasNext();

        public MultiDataSet next() {
            MultiDataSet mds = toMultiDataSet(iter.next());
            if(preProcessor != null) preProcessor.preProcess(mds);
            return mds;

        public void remove() {
            throw new UnsupportedOperationException();


Other Java examples (source code examples)

Here is a short list of links related to this Java ComputationGraphUtil.java source code file:

my book on functional programming


new blog posts


Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.