question: public void initStructure ( ) throws Exception { int nAttribute = 0 ; for ( int iOrder = 1 ; iOrder < m_Instances . numAttributes ( ) ; iOrder ++ ) { if ( nAttribute == m_Instances . classIndex ( ) ) { nAttribute ++ ; } } m_ParentSets = new ParentSet [ m_Instances . numAttributes ( ) ] ; for ( int iAttribute = 0 ; iAttribute < m_Instances . numAttributes ( ) ; iAttribute ++ ) { m_ParentSets [ iAttribute ] = new ParentSet ( m_Instances . numAttributes ( ) ) ; } }
target:  Init structure initializes the structure to an empty graph or a Naive Bayes graph (depending on the -N flag).