001/* 002 * BioJava development code 003 * 004 * This code may be freely distributed and modified under the 005 * terms of the GNU Lesser General Public Licence. This should 006 * be distributed with the code. If you do not have a copy, 007 * see: 008 * 009 * http://www.gnu.org/copyleft/lesser.html 010 * 011 * Copyright for this code is held jointly by the individual 012 * authors. These should be listed in @author doc comments. 013 * 014 * For more information on the BioJava project and its aims, 015 * or to join the biojava-l mailing list, visit the home page 016 * at: 017 * 018 * http://www.biojava.org/ 019 * 020 */ 021 022 023package org.biojava.stats.svm; 024 025import java.util.Iterator; 026 027/** 028 * <p> 029 * Abstract implementation of SVMClassifierModel. 030 * </p> 031 * 032 * <p> 033 * To implement a read-only implementation, you need only implement 034 * getThreshold and getAlpha. 035 * </p> 036 * 037 * @author Matthew Pocock 038 */ 039public abstract class AbstractSVMClassifierModel implements SVMClassifierModel { 040 public void setThreshold() 041 throws UnsupportedOperationException { 042 throw new UnsupportedOperationException( 043 "setThreshold not supported by " + getClass() 044 ); 045 } 046 047 public void setAlpha(Object item, double alpha) 048 throws UnsupportedOperationException { 049 throw new UnsupportedOperationException( 050 "setAlpha not supported by " + getClass() 051 ); 052 } 053 054 public void addItem(Object item) 055 throws UnsupportedOperationException { 056 throw new UnsupportedOperationException( 057 "addItem not supported by " + getClass() 058 ); 059 } 060 061 public void addItemAlpha(Object item, double alpha) 062 throws UnsupportedOperationException { 063 throw new UnsupportedOperationException( 064 "addItemAlpha not supported by " + getClass() 065 ); 066 } 067 068 public void removeItem(Object item) 069 throws UnsupportedOperationException { 070 throw new UnsupportedOperationException( 071 "removeItem not supported by " + getClass() 072 ); 073 } 074 075 076 public void clear() 077 throws UnsupportedOperationException { 078 throw new UnsupportedOperationException( 079 "clear not supported by " + getClass() 080 ); 081 } 082 083 public double classify(Object item) { 084 double delta=0; 085 SVMKernel kernel = getKernel(); 086 double threshold = getThreshold(); 087 for(Iterator i = itemAlphas().iterator(); i.hasNext(); ) { 088 ItemValue itemValue = (ItemValue) i.next(); 089 double alpha = itemValue.getValue(); 090 if (alpha != 0) 091 delta += alpha * kernel.evaluate(itemValue.getItem(), item); 092 } 093 return delta - threshold; 094 } 095}