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Java example source code file (MovingWindowDataSetFetcher.java)

This example Java source code file (MovingWindowDataSetFetcher.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

arraylist, basedatafetcher, dataset, indarray, list, movingwindowdatasetfetcher, override, util

The MovingWindowDataSetFetcher.java Java example source code

/*
 *
 *  * Copyright 2015 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.datasets.iterator.impl;

import org.deeplearning4j.datasets.fetchers.BaseDataFetcher;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.util.ArrayUtil;
import org.deeplearning4j.util.MovingWindowMatrix;


import java.util.ArrayList;
import java.util.List;

/**
 *
 * Moving window data fetcher. Handles rotation of matrices in all directions
 * to generate more examples.
 *
 *
 * @author Adam Gibson
 */
public class MovingWindowDataSetFetcher extends BaseDataFetcher  {

    private DataSet data;
    private int windowRows = 28,windowColumns = 28;
    private int cursor = 0;

    public MovingWindowDataSetFetcher(DataSet data,int windowRows,int windowColumns) {
        this.data = data;
        this.windowRows = windowRows;
        this.windowColumns = windowColumns;
        List<DataSet> list = data.asList();
        List<DataSet> flipped = new ArrayList<>();
        for(int i = 0; i < list.size(); i++) {
            INDArray label = list.get(i).getLabels();
            List<INDArray> windows = new MovingWindowMatrix(list.get(i).getFeatureMatrix(),windowRows,windowColumns,true).windows(true);
            for(int j = 0; j < windows.size(); j++) {
                flipped.add(new DataSet(windows.get(i),label));
            }
            flipped.add(list.get(i));
        }

        this.data = DataSet.merge(flipped);

    }

    /**
     * Fetches the next dataset. You need to call this
     * to getFromOrigin a new dataset, otherwise {@link #next()}
     * just returns the last data applyTransformToDestination fetch
     *
     * @param numExamples the number of examples to fetch
     */
    @Override
    public void fetch(int numExamples) {
          initializeCurrFromList(data.get(ArrayUtil.range(cursor, cursor + numExamples)).asList());

    }
}

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