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/**
 * Copyright 2009 DFKI GmbH.
 * All Rights Reserved.  Use is subject to license terms.
 *
 * This file is part of MARY TTS.
 *
 * MARY TTS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 */

package marytts.tools.voiceimport.traintrees;

import marytts.features.FeatureVector;

/**
 * @author marc
 * 
 */
public interface DistanceMeasure {
	/**
	 * Compute the distance between two feature vectors.
	 * 
	 * @param fv1
	 *            fv1
	 * @param fv2
	 *            fv2
	 * @return a non-negative float
	 */
	public float distance(FeatureVector fv1, FeatureVector fv2);

	/**
	 * Compute the squared distance between two feature vectors.
	 * 
	 * @param fv1
	 *            fv1
	 * @param fv2
	 *            fv2
	 * @return a non-negative float
	 */
	public float squaredDistance(FeatureVector fv1, FeatureVector fv2);
}