question: public String graph ( ) throws Exception { StringBuffer text = new StringBuffer ( ) ; assignIDs ( - 1 ) ; assignLeafModelNumbers ( 0 ) ; text . append ( "digraph LMTree {\n" ) ; if ( m_isLeaf ) { text . append ( "N" + m_id + " [label=\"LM_" + m_leafModelNum + ":" + getModelParameters ( ) + "\" " + "shape=box style=filled" ) ; text . append ( "]\n" ) ; } else { text . append ( "N" + m_id + " [label=\"" + Utils . backQuoteChars ( m_localModel . leftSide ( m_train ) ) + "\" " ) ; text . append ( "]\n" ) ; graphTree ( text ) ; } return text . toString ( ) + "}\n" ; }
target:  Returns graph describing the tree.