question: private PriorityQueue < USField > createQueue ( String fieldName , Map < String , Flt > words ) throws IOException { int numDocs = ir . numDocs ( ) ; FreqQ res = new FreqQ ( words . size ( ) ) ; for ( String word : words . keySet ( ) ) { float tf = words . get ( word ) . x ; if ( minTermFreq > 0 && tf < minTermFreq ) { continue ; } int docFreq = ir . docFreq ( new Term ( fieldName , word ) ) ; if ( minDocFreq > 0 && docFreq < minDocFreq ) { continue ; } if ( docFreq == 0 || docFreq > maxDocFreq ) { continue ; } float idf = similarity . idf ( docFreq , numDocs ) ; float score = 0 ; if ( isLogTf ( ) ) { score = ( float ) ( Math . log ( tf + 1 ) * idf ) ; } else { score = tf * idf ; } USField mltField ; if ( isPayloadField ( fieldName ) ) { mltField = new USField ( word , fieldName , score , tf , idf , docFreq , 1.01f ) ; } else { mltField = new USField ( word , fieldName , score , tf , idf , docFreq ) ; } res . insertWithOverflow ( mltField ) ; } return res ; }
target:  Create a PriorityQueue from a word->tf map.