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Java example source code file (Windows.java)

This example Java source code file (Windows.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, defaultstreamtokenizer, illegalstateexception, list, nonnull, stringtokenizer, tokenizer, tokenizerfactory, util, window, windows

The Windows.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.movingwindow;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import lombok.NonNull;
import org.deeplearning4j.berkeley.StringUtils;
import org.deeplearning4j.text.tokenization.tokenizer.DefaultStreamTokenizer;
import org.deeplearning4j.text.tokenization.tokenizer.Tokenizer;
import org.deeplearning4j.text.tokenization.tokenizerfactory.TokenizerFactory;

/**
 * Static utility class for textual based windowing cooccurrences
 * @author Adam Gibson
 */
public class Windows {


    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @param windowSize the window size to generate
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(InputStream words,int windowSize) {
        Tokenizer tokenizer = new DefaultStreamTokenizer(words);
        List<String> list = new ArrayList<>();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());
        return windows(list,windowSize);
    }

    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @param tokenizerFactory tokenizer factory to use
     * @param windowSize the window size to generate
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(InputStream words,TokenizerFactory tokenizerFactory,int windowSize) {
        Tokenizer tokenizer = tokenizerFactory.create(words);
        List<String> list = new ArrayList<>();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());

        if(list.isEmpty())
            throw new IllegalStateException("No tokens found for windows");

        return windows(list,windowSize);
    }


    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @param windowSize the window size to generate
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(String words,int windowSize) {
        StringTokenizer tokenizer = new StringTokenizer(words);
        List<String> list = new ArrayList();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());
        return windows(list,windowSize);
    }

    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @param tokenizerFactory tokenizer factory to use
     * @param windowSize the window size to generate
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(String words, @NonNull TokenizerFactory tokenizerFactory, int windowSize) {
        Tokenizer tokenizer = tokenizerFactory.create(words);
        List<String> list = new ArrayList<>();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());

        if(list.isEmpty())
            throw new IllegalStateException("No tokens found for windows");

        return windows(list,windowSize);
    }


    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(String words) {
        StringTokenizer tokenizer = new StringTokenizer(words);
        List<String> list = new ArrayList();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());
        return windows(list,5);
    }

    /**
     * Constructs a list of window of size windowSize.
     * Note that padding for each window is created as well.
     * @param words the words to tokenize and construct windows from
     * @param tokenizerFactory tokenizer factory to use
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(String words,TokenizerFactory tokenizerFactory) {
        Tokenizer tokenizer = tokenizerFactory.create(words);
        List<String> list = new ArrayList<>();
        while(tokenizer.hasMoreTokens())
            list.add(tokenizer.nextToken());
        return windows(list,5);
    }


    /**
     * Creates a sliding window from text
     * @param windowSize the window size to use
     * @param wordPos the position of the word to center
     * @param sentence the sentence to createComplex a window for
     * @return a window based on the given sentence
     */
    public static Window windowForWordInPosition(int windowSize,int wordPos,List<String> sentence) {
        List<String> window = new ArrayList<>();
        List<String> onlyTokens = new ArrayList<>();
        int contextSize = (int) Math.floor((windowSize - 1 ) / 2);

        for (int i =  wordPos - contextSize; i <= wordPos + contextSize;i++){
            if(i < 0)
                window.add("<s>");
            else if(i >= sentence.size())
                window.add("</s>");
            else  {
                onlyTokens.add(sentence.get(i));
                window.add(sentence.get(i));

            }
        }

        String wholeSentence = StringUtils.join(sentence);
        String window2 = StringUtils.join(onlyTokens);
        int begin = wholeSentence.indexOf(window2);
        int end =   begin + window2.length();
        return new Window(window, windowSize, begin,end);

    }


    /**
     * Constructs a list of window of size windowSize
     * @param words the words to  construct windows from
     * @return the list of windows for the tokenized string
     */
    public static List<Window> windows(List words,int windowSize) {

        List<Window> ret = new ArrayList<>();

        for(int i = 0; i < words.size(); i++)
            ret.add(windowForWordInPosition(windowSize,i,words));


        return ret;
    }

}

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