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Java example source code file (ReconstructionDataSetIterator.java)

This example Java source code file (ReconstructionDataSetIterator.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

dataset, datasetpreprocessor, list, override, reconstructiondatasetiterator, util

The ReconstructionDataSetIterator.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;


import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;

import java.util.List;

/**
 * Wraps a data applyTransformToDestination iterator setting the first (feature matrix) as
 * the labels.
 *
 * @author Adam Gibson
 */
public class ReconstructionDataSetIterator implements DataSetIterator {

    private DataSetIterator iter;
    private DataSetPreProcessor preProcessor;
    public ReconstructionDataSetIterator(DataSetIterator iter) {
        this.iter = iter;
    }

    /**
     * Like the standard next method but allows a
     * customizable number of examples returned
     *
     * @param num the number of examples
     * @return the next data applyTransformToDestination
     */
    @Override
    public DataSet next(int num) {
        DataSet ret = iter.next(num);
        ret.setLabels(ret.getFeatureMatrix());
        return ret;
    }

    /**
     * Total examples in the iterator
     *
     * @return
     */
    @Override
    public int totalExamples() {
        return iter.totalExamples();
    }

    /**
     * Input columns for the dataset
     *
     * @return
     */
    @Override
    public int inputColumns() {
        return iter.inputColumns();
    }

    /**
     * The number of labels for the dataset
     *
     * @return
     */
    @Override
    public int totalOutcomes() {
        return iter.totalOutcomes();
    }

    /**
     * Resets the iterator back to the beginning
     */
    @Override
    public void reset() {
        iter.reset();
    }

    /**
     * Batch size
     *
     * @return
     */
    @Override
    public int batch() {
        return iter.batch();
    }

    /**
     * The current cursor if applicable
     *
     * @return
     */
    @Override
    public int cursor() {
        return iter.cursor();
    }

    /**
     * Total number of examples in the dataset
     *
     * @return
     */
    @Override
    public int numExamples() {
        return iter.numExamples();
    }

    @Override
    public void setPreProcessor(org.nd4j.linalg.dataset.api.DataSetPreProcessor preProcessor) {
        this.preProcessor = (DataSetPreProcessor) preProcessor;
    }

    @Override
    public List<String> getLabels() {
        return null;
    }


    /**
     * Returns {@code true} if the iteration has more elements.
     * (In other words, returns {@code true} if {@link #next} would
     * return an element rather than throwing an exception.)
     *
     * @return {@code true} if the iteration has more elements
     */
    @Override
    public boolean hasNext() {
        return iter.hasNext();
    }

    /**
     * Returns the next element in the iteration.
     *
     * @return the next element in the iteration
     */
    @Override
    public DataSet next() {
        DataSet next = iter.next();
        next.setLabels(next.getFeatureMatrix());
        return next;
    }

    /**
     * Removes from the underlying collection the last element returned
     * by this iterator (optional operation).  This method can be called
     * only once per call to {@link #next}.  The behavior of an iterator
     * is unspecified if the underlying collection is modified while the
     * iteration is in progress in any way other than by calling this
     * method.
     *
     * @throws UnsupportedOperationException if the {@code remove}
     *                                       operation is not supported by this iterator
     * @throws IllegalStateException         if the {@code next} method has not
     *                                       yet been called, or the {@code remove} method has already
     *                                       been called after the last call to the {@code next}
     *                                       method
     */
    @Override
    public void remove() {
        iter.remove();
    }
}

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