question: double evaluateInstanceLeaveOneOut ( Instance instance , double [ ] instA ) throws Exception { DecisionTableHashKey thekey ; double [ ] tempDist ; double [ ] normDist ; thekey = new DecisionTableHashKey ( instA ) ; if ( m_classIsNominal ) { if ( ( tempDist = m_entries . get ( thekey ) ) == null ) { throw new Error ( "This should never happen!" ) ; } else { normDist = new double [ tempDist . length ] ; System . arraycopy ( tempDist , 0 , normDist , 0 , tempDist . length ) ; normDist [ ( int ) instance . classValue ( ) ] -= instance . weight ( ) ; boolean ok = false ; for ( double element : normDist ) { if ( Utils . gr ( element , 1.0 ) ) { ok = true ; break ; } } m_classPriorCounts [ ( int ) instance . classValue ( ) ] -= instance . weight ( ) ; double [ ] classPriors = m_classPriorCounts . clone ( ) ; Utils . normalize ( classPriors ) ; if ( ! ok ) { normDist = classPriors ; } m_classPriorCounts [ ( int ) instance . classValue ( ) ] += instance . weight ( ) ; Utils . normalize ( normDist ) ; if ( m_evaluationMeasure == EVAL_AUC ) { m_evaluation . evaluateModelOnceAndRecordPrediction ( normDist , instance ) ; } else { m_evaluation . evaluateModelOnce ( normDist , instance ) ; } return Utils . maxIndex ( normDist ) ; } } else { if ( ( tempDist = m_entries . get ( thekey ) ) != null ) { normDist = new double [ tempDist . length ] ; System . arraycopy ( tempDist , 0 , normDist , 0 , tempDist . length ) ; normDist [ 0 ] -= ( instance . classValue ( ) * instance . weight ( ) ) ; normDist [ 1 ] -= instance . weight ( ) ; if ( Utils . eq ( normDist [ 1 ] , 0.0 ) ) { double [ ] temp = new double [ 1 ] ; temp [ 0 ] = m_majority ; m_evaluation . evaluateModelOnce ( temp , instance ) ; return m_majority ; } else { double [ ] temp = new double [ 1 ] ; temp [ 0 ] = normDist [ 0 ] / normDist [ 1 ] ; m_evaluation . evaluateModelOnce ( temp , instance ) ; return temp [ 0 ] ; } } else { throw new Error ( "This should never happen!" ) ; } } }
target:  Classifies an instance for internal leave one out cross validation of feature sets