question: @ Override public boolean input ( Instance instance ) throws Exception { if ( getInputFormat ( ) == null ) { throw new IllegalStateException ( "No input instance format defined" ) ; } if ( m_NewBatch ) { resetQueue ( ) ; m_NewBatch = false ; } if ( isFirstBatchDone ( ) ) { ArrayList < Instance > fv = new ArrayList < Instance > ( ) ; int firstCopy = convertInstancewoDocNorm ( instance , fv ) ; Instance inst = fv . get ( 0 ) ; if ( m_filterType != FILTER_NONE ) { normalizeInstance ( inst , firstCopy ) ; } push ( inst ) ; return true ; } else { bufferInput ( instance ) ; return false ; } }
target:  Input an instance for filtering. Filter requires all training instances be read before producing output.