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Meaningness's profile
David Chapman
David Chapman
David Chapman
@Meaningness

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David Chapman

@Meaningness

Better ways of thinking, feeling, and acting—around problems of meaning and meaninglessness; self and society; ethics, purpose, and value.

meaningness.com/about-my-sites
Joined September 2010

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    1. David Chapman‏ @Meaningness 23 Jun 2018
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      Hmm! Think I’ve probably figured out something that has been puzzling me since about 1981. Eurisko, one of the most interesting AI programs ever, dramatically won a naval simulation game with the heuristic “choose nearly-extreme parameter values.” Why did that work?pic.twitter.com/Zbm50jlK6l

      6 replies 28 retweets 131 likes
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    2. David Chapman‏ @Meaningness 23 Jun 2018
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      Likely explanation: this is a manifestation of the counter-intuitive fact that essentially all of the volume of a high-dimensional solid is within ε of the surface. Here Richard Hammond points out the implications for design (h/t @devonzuegel):pic.twitter.com/FYH6GmJkOz

      4 replies 12 retweets 92 likes
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    3. Karl Rohe‏ @karlrohe 24 Jun 2018
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      Replying to @Meaningness @devonzuegel

      If in high dimensions, pushing one (or a few more) variables to extreme is a “sparse” solution. Sparsity has been hot in ML for at least 15 years as a way of handling the “curse of dimensionality” which is a consequence of the high dim geometry discussed here.

      1 reply 0 retweets 0 likes
    4. Karl Rohe‏ @karlrohe 24 Jun 2018
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      Replying to @karlrohe @Meaningness @devonzuegel

      This is a bit contradictory to the (imo backwards) argument that that “our uniform prior concentrates on the sphere” so we should look there.

      1 reply 0 retweets 0 likes
      David Chapman‏ @Meaningness 24 Jun 2018
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      Replying to @karlrohe @devonzuegel

      David Chapman Retweeted St. Rev  ☯️ 🏴 😻

      Yes, I was a bit confused about this. Cfhttps://twitter.com/St_Rev/status/1010742643809243138 …

      David Chapman added,

      St. Rev  ☯️ 🏴 😻 @St_Rev
      Replying to @Meaningness @devonzuegel
      I think this is very subtly misframed; it's not that choosing near-extreme parameters is a good strategy (if n = 100, then [1,0,0,...,0] is on the surface, though 99% of its parameters are 'small'; also 'near the surface' is a very weak restriction!)
      9:21 AM - 24 Jun 2018
      1 reply 0 retweets 0 likes
        1. David Chapman‏ @Meaningness 24 Jun 2018
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          Replying to @Meaningness @karlrohe @devonzuegel

          Also, accounts of the gameplay are scanty and we don’t know quite what happened. That said, it seems human players may have avoided most/all near-extreme values, and program chose at least some.

          0 replies 0 retweets 0 likes
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