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avibryant's profile
Avi Bryant
Avi Bryant
Avi Bryant
@avibryant

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Avi Bryant

@avibryant

Happiest when working on Random Forests from random beaches.

Galiano Island
avibryant.com
Joined November 2006

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    1. Avi Bryant‏ @avibryant 23 Aug 2013
      Replying to @fredbenenson

      @fredbenenson @johnmyleswhite ... and the experiment name makes a convenient salt.

      2 replies 0 retweets 0 likes
    2. John Myles White‏ @johnmyleswhite 23 Aug 2013
      Replying to @avibryant

      @avibryant @fredbenenson Yeah, this hashing strategy is the approach that Eytan at FB's been advocating for most web experiments.

      1 reply 0 retweets 0 likes
    3. Sean J. Taylor‏ @seanjtaylor 23 Aug 2013
      Replying to @johnmyleswhite

      @johnmyleswhite @avibryant @fredbenenson I've never worked on an experiment that *wasn't* implemented this way. The only sane way to do it.

      1 reply 0 retweets 0 likes
    4. John Myles White‏ @johnmyleswhite 23 Aug 2013
      Replying to @seanjtaylor

      @seanjtaylor @avibryant @fredbenenson I'm not sure it's the only sane way. Any tolerable RNG should work, no?

      1 reply 0 retweets 0 likes
    5. Sean J. Taylor‏ @seanjtaylor 23 Aug 2013
      Replying to @johnmyleswhite

      @johnmyleswhite @avibryant @fredbenenson Big advantage is no storage/retrieval of treatment status. Must GET/SET on every exposure with RNG.

      1 reply 0 retweets 0 likes
    6. John Myles White‏ @johnmyleswhite 23 Aug 2013
      Replying to @seanjtaylor

      @seanjtaylor @avibryant @fredbenenson Why? Isn't the hash just one form of RNG?

      2 replies 0 retweets 0 likes
    7. Sean J. Taylor‏ @seanjtaylor 23 Aug 2013
      Replying to @johnmyleswhite

      @johnmyleswhite @avibryant @fredbenenson Hash can be computed from data already at hand in requests. If you draw a RN, must store/retrieve.

      1 reply 0 retweets 0 likes
    8. John Myles White‏ @johnmyleswhite 23 Aug 2013
      Replying to @seanjtaylor

      @seanjtaylor @avibryant @fredbenenson Why draw a RN? Just pass user ID as seed to RNG. Simple RNG may do fewer ops than hash function.

      3 replies 0 retweets 0 likes
    9. Avi Bryant‏ @avibryant 23 Aug 2013
      Replying to @johnmyleswhite

      @johnmyleswhite ... I would call that a hash function :) /cc @seanjtaylor @fredbenenson

      3 replies 0 retweets 1 like
    10. John Myles White‏ @johnmyleswhite 23 Aug 2013
      Replying to @avibryant

      @avibryant @seanjtaylor @fredbenenson That's fair. I'm just wondering if modern hashes are overkill since you don't need 64 bits of entropy.

      1 reply 0 retweets 0 likes
      Avi Bryant‏ @avibryant 23 Aug 2013
      Replying to @johnmyleswhite

      @johnmyleswhite @seanjtaylor @fredbenenson yes, good point. I would still say you want a hash function, just that a dumb fast one is fine.

      12:53 PM - 23 Aug 2013
      2 replies 0 retweets 0 likes
        1. New conversation
        2. mat kelcey‏ @mat_kelcey 23 Aug 2013
          Replying to @avibryant

          @avibryant @johnmyleswhite @seanjtaylor @fredbenenson if you are at the point of wanting to optimise, say, murmurhash then congratulations!

          1 reply 0 retweets 0 likes
        3. John Myles White‏ @johnmyleswhite 23 Aug 2013
          Replying to @mat_kelcey

          @mat_kelcey @avibryant @seanjtaylor @fredbenenson Why do you need to better than MurmurHash when you only need 1 bit of entropy?

          1 reply 0 retweets 0 likes
        4. Josh Wills‏ @josh_wills 23 Aug 2013
          Replying to @johnmyleswhite

          @johnmyleswhite @mat_kelcey @avibryant @seanjtaylor @fredbenenson that's not true: most people are in multiple experiments.

          2 replies 0 retweets 0 likes
        5. John Myles White‏ @johnmyleswhite 23 Aug 2013
          Replying to @josh_wills

          @josh_wills @mat_kelcey @avibryant @seanjtaylor @fredbenenson Use Sean's strategy and add the same constant offset for each experiment?

          1 reply 0 retweets 0 likes
        6. Josh Wills‏ @josh_wills 23 Aug 2013
          Replying to @johnmyleswhite

          @johnmyleswhite @mat_kelcey @avibryant @seanjtaylor @fredbenenson I'm assuming everyone has read http://research.google.com/pubs/pub36500.html … ?

          1 reply 0 retweets 8 likes
        7. John Myles White‏ @johnmyleswhite 23 Aug 2013
          Replying to @josh_wills

          @josh_wills @mat_kelcey @avibryant @seanjtaylor @fredbenenson I never had. Thanks for the link.

          1 reply 0 retweets 0 likes
        8. Peter Seibel‏ @peterseibel 23 Aug 2013
          Replying to @johnmyleswhite

          @johnmyleswhite @josh_wills @mat_kelcey @avibryant @seanjtaylor @fredbenenson Also look up Kohavi's papers on AB testing.

          0 replies 0 retweets 2 likes
        9. End of conversation
        1. New conversation
        2. Sean J. Taylor‏ @seanjtaylor 23 Aug 2013
          Replying to @avibryant

          @avibryant @johnmyleswhite @fredbenenson Here's how dumb: hash function for our Science paper was mod(comment_id + time_stamp, 100) <= 4

          1 reply 0 retweets 1 like
        3. John Myles White‏ @johnmyleswhite 23 Aug 2013
          Replying to @seanjtaylor

          @seanjtaylor @avibryant @fredbenenson That worked. Would have thought 100 was too composite for modular values to be well dispersed.

          0 replies 0 retweets 0 likes
        4. End of conversation

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