opennlp.tools.doccat.DocumentCategorizer.java Source code

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Here is the source code for opennlp.tools.doccat.DocumentCategorizer.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 opennlp.tools.doccat;

import java.util.Map;
import java.util.Set;
import java.util.SortedMap;

/**
 * Interface for classes which categorize documents.
 */
public interface DocumentCategorizer {

    /**
     * Categorize the given text provided as tokens along with
     * the provided extra information
     *
     * @param text the tokens of text to categorize
     * @param extraInformation extra information
     * @return per category probabilities
     */
    double[] categorize(String[] text, Map<String, Object> extraInformation);

    /**
     * Categorizes the given text, provided in separate tokens.
     * @param text the tokens of text to categorize
     * @return per category probabilities
     */
    double[] categorize(String[] text);

    /**
     * get the best category from previously generated outcome probabilities
     *
     * @param outcome a vector of outcome probabilities
     * @return the best category String
     */
    String getBestCategory(double[] outcome);

    /**
     * get the index of a certain category
     *
     * @param category the category
     * @return an index
     */
    int getIndex(String category);

    /**
     * get the category at a given index
     *
     * @param index the index
     * @return a category
     */
    String getCategory(int index);

    /**
     * get the number of categories
     *
     * @return the no. of categories
     */
    int getNumberOfCategories();

    /**
     * get the name of the category associated with the given probabilties
     *
     * @param results the probabilities of each category
     * @return the name of the outcome
     */
    String getAllResults(double[] results);

    /**
     * Returns a map in which the key is the category name and the value is the score
     *
     * @param text the input text to classify
     * @return a map with the score as a key. The value is a Set of categories with the score.
     */
    Map<String, Double> scoreMap(String[] text);

    /**
     * Get a map of the scores sorted in ascending aorder together with their associated categories.
     * Many categories can have the same score, hence the Set as value
     *
     * @param text the input text to classify
     * @return a map with the score as a key. The value is a Set of categories with the score.
     */
    SortedMap<Double, Set<String>> sortedScoreMap(String[] text);

}