question: private void buildLinearModel ( int [ ] indices ) throws Exception { Instances reducedInst = new Instances ( m_instances ) ; Remove attributeFilter = new Remove ( ) ; attributeFilter . setInvertSelection ( true ) ; attributeFilter . setAttributeIndicesArray ( indices ) ; attributeFilter . setInputFormat ( reducedInst ) ; reducedInst = Filter . useFilter ( reducedInst , attributeFilter ) ; LinearRegression temp = new LinearRegression ( ) ; temp . buildClassifier ( reducedInst ) ; double [ ] lmCoeffs = temp . coefficients ( ) ; double [ ] coeffs = new double [ m_instances . numAttributes ( ) ] ; for ( int i = 0 ; i < lmCoeffs . length - 1 ; i ++ ) { if ( indices [ i ] != m_classIndex ) { coeffs [ indices [ i ] ] = lmCoeffs [ i ] ; } } m_nodeModel = new PreConstructedLinearModel ( coeffs , lmCoeffs [ lmCoeffs . length - 1 ] ) ; m_nodeModel . buildClassifier ( m_instances ) ; }
target:  Build a linear model for this node using those attributes specified in indices.