question: private double naiveQueryDense ( NumberVector obj , WritableDoubleDataStore scores , HashSetModifiableDBIDs cands ) { double len = 0. ; for ( int dim = 0 , max = obj . getDimensionality ( ) ; dim < max ; dim ++ ) { final double val = obj . doubleValue ( dim ) ; if ( val == 0. || val != val ) { continue ; } len += val * val ; if ( dim >= index . size ( ) ) { continue ; } ModifiableDoubleDBIDList column = index . get ( dim ) ; for ( DoubleDBIDListIter n = column . iter ( ) ; n . valid ( ) ; n . advance ( ) ) { scores . increment ( n , n . doubleValue ( ) * val ) ; cands . add ( n ) ; } } return Math . sqrt ( len ) ; }
target:  Query the most similar objects, dense version.