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Java example source code file (BaseDatasetIterator.java)

This example Java source code file (BaseDatasetIterator.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

basedatafetcher, basedatasetiterator, dataset, datasetpreprocessor, list, override, unsupportedoperationexception, util

The BaseDatasetIterator.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.deeplearning4j.datasets.fetchers.BaseDataFetcher;
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;

/**
 * Baseline implementation includes
 * control over the data fetcher and some basic
 * getters for metadata
 * @author Adam Gibson
 *
 */
public class BaseDatasetIterator implements DataSetIterator {

	protected int batch,numExamples;
	protected BaseDataFetcher fetcher;
	protected DataSetPreProcessor preProcessor;
	
	
	public BaseDatasetIterator(int batch, int numExamples, BaseDataFetcher fetcher) {
		this.batch = batch;
		if(numExamples < 0)
			numExamples = fetcher.totalExamples();
		
		this.numExamples = numExamples;
		this.fetcher = fetcher;
	}

	@Override
	public boolean hasNext() {
		return fetcher.hasMore() && fetcher.cursor() < numExamples;
	}

	@Override
	public DataSet next() {
		fetcher.fetch(batch);
		DataSet result = fetcher.next();
		if(preProcessor != null) {
			preProcessor.preProcess(result);
		}
		return result;
	}

	@Override
	public DataSet next(int num) {
		fetcher.fetch(num);
		DataSet next =  fetcher.next();
		if(preProcessor != null)
			preProcessor.preProcess(next);
		return next;
	}

	@Override
	public void remove() {
		throw new UnsupportedOperationException();
	}

	@Override
	public int totalExamples() {
		return fetcher.totalExamples();
	}

	@Override
	public int inputColumns() {
		return fetcher.inputColumns();
	}

	@Override
	public int totalOutcomes() {
		return fetcher.totalOutcomes();
	}

	@Override
	public void reset() {
		fetcher.reset();
	}

	@Override
	public int batch() {
		return batch;
	}

	@Override
	public int cursor() {
		return fetcher.cursor();
	}

	@Override
	public int numExamples() {
		return numExamples;
	}

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

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


}

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