classifier.java

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package ir.classifiers;

import java.util.*;
import ir.vsr.*;

/**
 * Abstract class specifying the functionality of a classifier. Provides methods for 
 * training and testing a classifier
 *
 * @author       Sugato Basu
 */

public abstract class Classifier {
     
    /** Array of categories (classes) in the data */
    protected String[] categories;

    /** To be overloaded by the extending class */
    public abstract String getName();

    public String[] getCategories() {
	return categories;
    }

    /** Trains the classifier on the training examples */
    public abstract void train(List trainingExamples);
    
    /** Returns true if the predicted category of the test example matches the correct category,
	false otherwise */
    public abstract boolean test(Example testExample);

    /** Returns the array index with the maximum value 
     * @params Array whose index with max value has to be found
     */
    protected int argMax(double[] results){
	int maxIndex = 0;
	double max = results[0];
	
	for(int i=1;i<results.length;i++){
	    if(results[i]>max){
		max=results[i];
		maxIndex = i;
	    }
	}
	return(maxIndex);
    }
}