com.github.fracpete.multisearch.ExampleHelper.java Source code

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Here is the source code for com.github.fracpete.multisearch.ExampleHelper.java

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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * MultiSearchHelper.java
 * Copyright (C) 2016 University of Waikato, Hamilton, NZ
 */

package com.github.fracpete.multisearch;

import weka.core.Instances;
import weka.core.converters.ConverterUtils.DataSource;

/**
 * Helper class for the examples.
 *
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision$
 */
public class ExampleHelper {

    /**
     * Loads the dataset from disk.
     *
     * @param filename   the file to load
     * @param classIndex   the 1-based class index (first and last accepted as well),
     *                    uses last attribute if null
     * @return      the dataset
     * @throws Exception   if loading of data fails
     */
    public static Instances loadData(String filename, String classIndex) throws Exception {
        Instances data = DataSource.read(filename);
        if (classIndex != null) {
            if (classIndex.equals("first"))
                data.setClassIndex(0);
            else if (classIndex.equals("last"))
                data.setClassIndex(data.numAttributes() - 1);
            else
                data.setClassIndex(Integer.parseInt(classIndex) - 1);
        } else {
            data.setClassIndex(data.numAttributes() - 1);
        }
        return data;
    }
}