The value of weight is 0.3896 (=( 1.0 log(20+20) ) 2.0 ) when m and n are respectively 20.
the weight of non-matched words decreases in short sentences adding the large value (e.g., 1.2261) of weight to the matching words (i.e., RN −1 i=0 α i × C score in Eqs.