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Java example source code file (Word2VecDataFetcher.java)

This example Java source code file (Word2VecDataFetcher.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

a-z, arraylist, dataset, file, illegalargumentexception, indarray, iterator, lineiterator, list, override, pattern, regex, runtimeexception, util, word2vec, word2vecdatafetcher

The Word2VecDataFetcher.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.models.word2vec.iterator;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.LineIterator;
import org.deeplearning4j.datasets.iterator.DataSetFetcher;
import org.deeplearning4j.models.word2vec.Word2Vec;
import org.deeplearning4j.text.movingwindow.Window;
import org.deeplearning4j.text.movingwindow.WindowConverter;
import org.deeplearning4j.text.movingwindow.Windows;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.util.FeatureUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;

/**
 *
 */
public class Word2VecDataFetcher implements DataSetFetcher {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3245955804749769475L;
	private transient Iterator<File> files;
	private Word2Vec vec;
	private static Pattern begin = Pattern.compile("<[A-Z]+>");
	private static Pattern end = Pattern.compile("</[A-Z]+>");
	private List<String> labels = new ArrayList();
	private int batch;
	private List<Window> cache = new ArrayList();
	private static final Logger log = LoggerFactory.getLogger(Word2VecDataFetcher.class);
	private int totalExamples;
	private String path;
	
	public Word2VecDataFetcher(String path,Word2Vec vec,List<String> labels) {
		if(vec == null || labels == null || labels.isEmpty())
			throw new IllegalArgumentException("Unable to initialize due to missing argument or empty label applyTransformToDestination");
		this.vec = vec;
		this.labels = labels;
		this.path = path;
	}



	private DataSet fromCache() {
		INDArray outcomes = null;
		INDArray input = null;
		input =  Nd4j.create(batch, vec.lookupTable().layerSize() * vec.getWindow());
		outcomes =Nd4j.create(batch, labels.size());
		for(int i = 0; i < batch; i++) {
			input.putRow(i, WindowConverter.asExampleMatrix(cache.get(i),vec));
			int idx = labels.indexOf(cache.get(i).getLabel());
			if(idx < 0)
				idx = 0;
			outcomes.putRow(i, FeatureUtil.toOutcomeVector(idx, labels.size()));
		}
		return new DataSet(input,outcomes);

	}

	@Override
	public DataSet next() {
		//pop from cache when possible, or when there's nothing left
		if(cache.size() >= batch || !files.hasNext()) 
			return fromCache();



		File f = files.next();
		try {
			LineIterator lines = FileUtils.lineIterator(f);
			INDArray outcomes = null;
			INDArray input = null;

			while(lines.hasNext()) {
				List<Window> windows = Windows.windows(lines.nextLine());
				if(windows.isEmpty() && lines.hasNext())
		              continue;
				
				if(windows.size() < batch) {
					input = Nd4j.create(windows.size(),vec.lookupTable().layerSize() * vec.getWindow());
					outcomes = Nd4j.create(batch,labels.size());
					for(int i = 0; i < windows.size(); i++) {
                        input.putRow(i, WindowConverter.asExampleMatrix(cache.get(i), vec));
						int idx = labels.indexOf(windows.get(i).getLabel());
						if(idx < 0)
							idx = 0;
						INDArray outcomeRow = FeatureUtil.toOutcomeVector(idx, labels.size());
						outcomes.putRow(i,outcomeRow);
					}
					return new DataSet(input,outcomes);


				}
				else {
					input = Nd4j.create(batch,vec.lookupTable().layerSize() * vec.getWindow());
					outcomes = Nd4j.create(batch,labels.size());
					for(int i = 0; i < batch; i++) {
                        input.putRow(i, WindowConverter.asExampleMatrix(cache.get(i), vec));
						int idx = labels.indexOf(windows.get(i).getLabel());
						if(idx < 0)
							idx = 0;
						INDArray outcomeRow = FeatureUtil.toOutcomeVector(idx, labels.size());
						outcomes.putRow(i,outcomeRow);
					}
					//add left over to cache; need to ensure that only batch rows are returned
					/*
					 * Note that I'm aware of possible concerns for sentence sequencing.
					 * This is a hack right now in place of something
					 * that will be way more elegant in the future.
					 */
					if(windows.size() > batch) {
						List<Window> leftOvers = windows.subList(batch,windows.size());
						cache.addAll(leftOvers);
					}
					return new DataSet(input,outcomes);
				}

			}
		} catch (IOException e) {
			throw new RuntimeException(e);
		}

		return null;
	}



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

	@Override
	public int inputColumns() {
		return vec.lookupTable().layerSize() * vec.getWindow();
	}

	@Override
	public int totalOutcomes() {
		return labels.size();

	}

	@Override
	public void reset() {
		files = FileUtils.iterateFiles(new File(path), null, true);
		cache.clear();

	}



	@Override
	public int cursor() {
		return 0;

	}



	@Override
	public boolean hasMore() {
		return files.hasNext() || !cache.isEmpty();
	}

	@Override
	public void fetch(int numExamples) {
		this.batch = numExamples;
	}

	public Iterator<File> getFiles() {
		return files;
	}

	public Word2Vec getVec() {
		return vec;
	}

	public static Pattern getBegin() {
		return begin;
	}

	public static Pattern getEnd() {
		return end;
	}

	public List<String> getLabels() {
		return labels;
	}

	public int getBatch() {
		return batch;
	}

	public List<Window> getCache() {
		return cache;
	}





}

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