| package org.apache.samoa.moa.classifiers.core.attributeclassobservers; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2014 - 2015 Apache Software Foundation |
| * %% |
| * 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 java.io.Serializable; |
| |
| import org.apache.samoa.moa.classifiers.core.AttributeSplitSuggestion; |
| import org.apache.samoa.moa.classifiers.core.splitcriteria.SplitCriterion; |
| import org.apache.samoa.moa.core.ObjectRepository; |
| import org.apache.samoa.moa.options.AbstractOptionHandler; |
| import org.apache.samoa.moa.tasks.TaskMonitor; |
| |
| /** |
| * Class for observing the class data distribution for a numeric attribute using a binary tree. This observer monitors |
| * the class distribution of a given attribute. |
| * |
| * <p> |
| * Learning Adaptive Model Rules from High-Speed Data Streams, ECML 2013, E. Almeida, C. Ferreira, P. Kosina and J. |
| * Gama; |
| * </p> |
| * |
| * @author E. Almeida, J. Gama |
| * @version $Revision: 2$ |
| */ |
| public class BinaryTreeNumericAttributeClassObserverRegression extends AbstractOptionHandler |
| implements NumericAttributeClassObserver { |
| |
| public static final long serialVersionUID = 1L; |
| |
| public class Node implements Serializable { |
| |
| private static final long serialVersionUID = 1L; |
| |
| public double cut_point; |
| |
| public double[] lessThan; // This array maintains statistics for the instance reaching the node with attribute values less than or iqual to the cutpoint. |
| |
| public double[] greaterThan; // This array maintains statistics for the instance reaching the node with attribute values greater than to the cutpoint. |
| |
| public Node left; |
| |
| public Node right; |
| |
| public Node(double val, double target) { |
| this.cut_point = val; |
| this.lessThan = new double[3]; |
| this.greaterThan = new double[3]; |
| this.lessThan[0] = target; // The sum of their target attribute values. |
| this.lessThan[1] = target * target; // The sum of the squared target attribute values. |
| this.lessThan[2] = 1.0; // A counter of the number of instances that have reached the node. |
| this.greaterThan[0] = 0.0; |
| this.greaterThan[1] = 0.0; |
| this.greaterThan[2] = 0.0; |
| } |
| |
| public void insertValue(double val, double target) { |
| if (val == this.cut_point) { |
| this.lessThan[0] = this.lessThan[0] + target; |
| this.lessThan[1] = this.lessThan[1] + (target * target); |
| this.lessThan[2] = this.lessThan[2] + 1; |
| } else if (val <= this.cut_point) { |
| this.lessThan[0] = this.lessThan[0] + target; |
| this.lessThan[1] = this.lessThan[1] + (target * target); |
| this.lessThan[2] = this.lessThan[2] + 1; |
| if (this.left == null) { |
| this.left = new Node(val, target); |
| } else { |
| this.left.insertValue(val, target); |
| } |
| } else { |
| this.greaterThan[0] = this.greaterThan[0] + target; |
| this.greaterThan[1] = this.greaterThan[1] + (target * target); |
| this.greaterThan[2] = this.greaterThan[2] + 1; |
| if (this.right == null) { |
| |
| this.right = new Node(val, target); |
| } else { |
| this.right.insertValue(val, target); |
| } |
| } |
| } |
| } |
| |
| public Node root1 = null; |
| |
| public void observeAttributeTarget(double attVal, double target) { |
| if (!Double.isNaN(attVal)) { |
| if (this.root1 == null) { |
| this.root1 = new Node(attVal, target); |
| } else { |
| this.root1.insertValue(attVal, target); |
| } |
| } |
| } |
| |
| @Override |
| public void observeAttributeClass(double attVal, int classVal, double weight) { |
| |
| } |
| |
| @Override |
| public double probabilityOfAttributeValueGivenClass(double attVal, |
| int classVal) { |
| return 0.0; |
| } |
| |
| @Override |
| public AttributeSplitSuggestion getBestEvaluatedSplitSuggestion( |
| SplitCriterion criterion, double[] preSplitDist, int attIndex, |
| boolean binaryOnly) { |
| return searchForBestSplitOption(this.root1, null, null, null, null, false, |
| criterion, preSplitDist, attIndex); |
| } |
| |
| protected AttributeSplitSuggestion searchForBestSplitOption( |
| Node currentNode, AttributeSplitSuggestion currentBestOption, |
| double[] actualParentLeft, |
| double[] parentLeft, double[] parentRight, boolean leftChild, |
| SplitCriterion criterion, double[] preSplitDist, int attIndex) { |
| |
| return currentBestOption; |
| } |
| |
| @Override |
| public void getDescription(StringBuilder sb, int indent) { |
| } |
| |
| @Override |
| protected void prepareForUseImpl(TaskMonitor monitor, ObjectRepository repository) { |
| } |
| } |