Github user Yunni commented on the issue:

    https://github.com/apache/spark/pull/15148
  
    Hi @sethah 
    
    - My understanding is h(x) = floor((g1 dot x) / w) is one hash function, as 
is in the wiki.
    - In bulletpoint 6 of "Approach found on Wikipedia and here and here", we 
have a problem of the number of candidates is smaller than k. So we use a trick 
of hashDistance to avoid this problem. 


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