question: private void handleEnumeratedAttribute ( Instances trainInstances ) throws Exception { Instance instance ; m_distribution = new Distribution ( m_complexityIndex , trainInstances . numClasses ( ) ) ; Enumeration < Instance > enu = trainInstances . enumerateInstances ( ) ; while ( enu . hasMoreElements ( ) ) { instance = enu . nextElement ( ) ; if ( ! instance . isMissing ( m_attIndex ) ) { m_distribution . add ( ( int ) instance . value ( m_attIndex ) , instance ) ; } } if ( m_distribution . check ( m_minNoObj ) ) { m_numSubsets = m_complexityIndex ; m_infoGain = infoGainCrit . splitCritValue ( m_distribution , m_sumOfWeights ) ; m_gainRatio = gainRatioCrit . splitCritValue ( m_distribution , m_sumOfWeights , m_infoGain ) ; } }
target:  Creates split on enumerated attribute.