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/*******************************************************************************
 * Copyright (c) 2010 Haifeng Li
 *
 * 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 smile.classification;

/**
 * Soft classifiers calculate a posteriori probabilities besides the class
 * label of an instance.
 *
 * @param  the type of input object
 *
 * @author Haifeng Li
 */
public interface SoftClassifier extends Classifier {
    /**
     * Predicts the class label of an instance and also calculate a posteriori
     * probabilities. Classifiers may NOT support this method since not all
     * classification algorithms are able to calculate such a posteriori
     * probabilities.
     *
     * @param x the instance to be classified.
     * @param posteriori the array to store a posteriori probabilities on output.
     * @return the predicted class label
     */
    public int predict(T x, double[] posteriori);

}