question: private static DoubleWritable covertToDistance ( DoubleWritable value ) { if ( Math . abs ( value . get ( ) ) > 0 ) { value . set ( ( 1.0 / value . get ( ) ) - 1.0 ) ; } else { value . set ( Double . MAX_VALUE ) ; } return value ; }
target:  Converts the [0,1] similarity value to a distance which takes values in [0, INF].