Java example source code file (InputHomogenization.java)

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Java - Java tags/keywords

inputhomogenization, list, string, stringbuffer, text, util

The InputHomogenization.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.inputsanitation;

import java.text.Normalizer;
import java.text.Normalizer.Form;
import java.util.List;

/**
 * Performs some very basic textual transformations 
 * such as word shape, lower casing, and stripping of punctuation
 * @author Adam Gibson
 *
 */
public class InputHomogenization {
	private String input;
	private List<String> ignoreCharactersContaining;
	private boolean preserveCase;
	
	/**
	 * Input text to applyTransformToOrigin
	 * @param input the input text to applyTransformToOrigin,
	 * equivalent to calling this(input,false)
	 * wrt preserving case
	 */
	public InputHomogenization(String input) {
		this(input,false);
	}
	
	/**
	 * 
	 * @param input the input to applyTransformToOrigin
	 * @param preserveCase whether to preserve case
	 */
	public InputHomogenization(String input,boolean preserveCase) {
		this.input = input;
		this.preserveCase = preserveCase;
	}
	
	/**
	 * 
	 * @param input the input to applyTransformToOrigin
	 * @param ignoreCharactersContaining ignore transformation of words
	 * containigng specified strings
	 */
	public InputHomogenization(String input,List<String> ignoreCharactersContaining) {
		this.input = input;
		this.ignoreCharactersContaining = ignoreCharactersContaining;
	}
	/**
	 * Returns the normalized text passed in via constructor
	 * @return the normalized text passed in via constructor
	 */
	public String transform() {
		StringBuffer sb = new StringBuffer();
		for(int i = 0; i < input.length(); i++) {
			if(ignoreCharactersContaining != null && ignoreCharactersContaining.contains(String.valueOf(input.charAt(i))))
				sb.append(input.charAt(i));
			else if(Character.isDigit(input.charAt(i)))
				sb.append("d");
			else if(Character.isUpperCase(input.charAt(i)) && !preserveCase)
					sb.append(Character.toLowerCase(input.charAt(i)));

			else 
				sb.append(input.charAt(i));

		}
		
		String normalized = Normalizer.normalize(sb.toString(),Form.NFD);
		normalized = normalized.replace(".","");
		normalized = normalized.replace(",","");
		normalized = normalized.replaceAll("\"","");
		normalized = normalized.replace("'","");
		normalized = normalized.replace("(","");
		normalized = normalized.replace(")","");
		normalized = normalized.replace("“","");
		normalized = normalized.replace("”","");
		normalized = normalized.replace("…","");
		normalized = normalized.replace("|","");
		normalized = normalized.replace("/","");
		normalized = normalized.replace("\\", "");
		normalized = normalized.replace("[", "");
		normalized = normalized.replace("]", "");
		normalized = normalized.replace("‘","");
		normalized = normalized.replace("’","");
        normalized = normalized.replaceAll("[!]+","!");
		return normalized;
	}

}