| package com.yahoo.labs.samoa.moa.classifiers.core.attributeclassobservers; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2007 University of Waikato, Hamilton, New Zealand |
| * %% |
| * 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. |
| * #L% |
| */ |
| |
| import com.yahoo.labs.samoa.moa.classifiers.core.AttributeSplitSuggestion; |
| import com.yahoo.labs.samoa.moa.classifiers.core.splitcriteria.SplitCriterion; |
| import com.yahoo.labs.samoa.moa.options.OptionHandler; |
| |
| /** |
| * Interface for observing the class data distribution for an attribute. |
| * This observer monitors the class distribution of a given attribute. |
| * Used in naive Bayes and decision trees to monitor data statistics on leaves. |
| * |
| * @author Richard Kirkby (rkirkby@cs.waikato.ac.nz) |
| * @version $Revision: 7 $ |
| */ |
| public interface AttributeClassObserver extends OptionHandler { |
| |
| /** |
| * Updates statistics of this observer given an attribute value, a class |
| * and the weight of the instance observed |
| * |
| * @param attVal the value of the attribute |
| * @param classVal the class |
| * @param weight the weight of the instance |
| */ |
| public void observeAttributeClass(double attVal, int classVal, double weight); |
| |
| /** |
| * Gets the probability for an attribute value given a class |
| * |
| * @param attVal the attribute value |
| * @param classVal the class |
| * @return probability for an attribute value given a class |
| */ |
| public double probabilityOfAttributeValueGivenClass(double attVal, |
| int classVal); |
| |
| /** |
| * Gets the best split suggestion given a criterion and a class distribution |
| * |
| * @param criterion the split criterion to use |
| * @param preSplitDist the class distribution before the split |
| * @param attIndex the attribute index |
| * @param binaryOnly true to use binary splits |
| * @return suggestion of best attribute split |
| */ |
| public AttributeSplitSuggestion getBestEvaluatedSplitSuggestion( |
| SplitCriterion criterion, double[] preSplitDist, int attIndex, |
| boolean binaryOnly); |
| |
| |
| public void observeAttributeTarget(double attVal, double target); |
| |
| } |