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Java example source code file (TreeIterator.java)

This example Java source code file (TreeIterator.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, exception, labelawaresentenceiterator, list, override, runtimeexception, treeiterator, treevectorizer, unsupportedoperationexception, util

The TreeIterator.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.text.corpora.treeparser;

import org.deeplearning4j.nn.layers.feedforward.autoencoder.recursive.Tree;
import org.deeplearning4j.text.sentenceiterator.labelaware.LabelAwareSentenceIterator;

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

/**
 * Tree iterator: iterate over sentences
 * returning trees with labels and everything already
 * preset
 *
 * @author Adam Gibson
 */
public class TreeIterator implements Iterator<List {

    private LabelAwareSentenceIterator sentenceIterator;
    private List<String> labels;
    private TreeVectorizer treeVectorizer;
    private int batchSize = 3;



    public TreeIterator(LabelAwareSentenceIterator sentenceIterator, List<String> labels, TreeVectorizer treeVectorizer,int batchSize) {
        this.sentenceIterator = sentenceIterator;
        this.labels = labels;
        this.treeVectorizer = treeVectorizer;
        this.batchSize = batchSize;
    }

    public TreeIterator(LabelAwareSentenceIterator sentenceIterator, List<String> labels, TreeVectorizer treeVectorizer) {
        this.sentenceIterator = sentenceIterator;
        this.labels = labels;
        this.treeVectorizer = treeVectorizer;
        batchSize = labels.size();
    }

    public TreeIterator(LabelAwareSentenceIterator sentenceIterator, List<String> labels) throws Exception {
        this(sentenceIterator,labels,new TreeVectorizer());
    }


    /**
     * 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 sentenceIterator.hasNext();
    }

    /**
     * Returns the next element in the iteration.
     *
     * @return the next element in the iteration
     */
    @Override
    public List<Tree> next() {
        List<Tree> ret = new ArrayList<>();
        try {
            for(int i = 0; i < batchSize; i++)
                if(hasNext())
                    ret.addAll(treeVectorizer.getTreesWithLabels(sentenceIterator.nextSentence(), sentenceIterator.currentLabel(), labels));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return ret;
    }

    /**
     * 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() {
        throw new UnsupportedOperationException();
    }
}

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