/*******************************************************************************
* 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.feature;
/**
* Univariate feature ranking metric.
*
* @author Haifeng Li
*/
public interface FeatureRanking {
/**
* Univariate feature ranking. Note that this method actually does NOT rank
* the features. It just returns the metric values of each feature. The
* caller can then rank and select features.
*
* @param x a n-by-p matrix of n instances with p features.
* @param y class labels in [0, k), where k is the number of classes.
* @return the metric values of each feature.
*/
public double[] rank(double[][] x, int[] y);
}