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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. P. Oscar Boykin‏ @posco 7 Nov 2019

      If you could ask a single yes/no question of someone from the year 2050, and get a truthful response, what would it be?

      55 replies 6 retweets 31 likes
    2. Jon Pretty‏ @propensive 7 Nov 2019
      Replying to @posco

      It's quite interesting that this opportunity to receive a prescient, binary fact doesn't really offer much of any use. As an optimization problem, you'd want to maximise the expected differential of impact that knowledge would have on your life.

      1 reply 0 retweets 5 likes
    3. François Armand‏ @fanf42 8 Nov 2019
      Replying to @propensive @posco

      François Armand Retweeted François Armand

      false. You need to think globally. There's someone from 2050, so at least some humans survived. So you can learn how they survived, and use that to influence globally the path toward sustainability:https://twitter.com/fanf42/status/1192896905233256448 …

      François Armand added,

      François Armand @fanf42
      Replying to @fanf42 @posco
      (positive whatever the answer: no gives more power to radical shift and try to avoid that futur, hopefully forcing creativity under stress ; yes implies there's at least one way to succeed in that goal, and help keep motivation even in hard moments)
      1 reply 0 retweets 2 likes
    4. Jon Pretty‏ @propensive 8 Nov 2019
      Replying to @fanf42 @posco

      But you can do so very little with just one binary answer...

      1 reply 0 retweets 0 likes
    5. P. Oscar Boykin‏ @posco 8 Nov 2019
      Replying to @propensive @fanf42

      Imagine how it changes if with probability p they lie.

      1 reply 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 8 Nov 2019
      Replying to @posco @fanf42

      Well it certainly doesn't make things easier... But I guess that the utility of the answer would become proportional to 2|½-p|.

      1 reply 0 retweets 0 likes
    7. P. Oscar Boykin‏ @posco 8 Nov 2019
      Replying to @propensive @fanf42

      I think 1-H(p) but with a single question it’s hard to think what this really means for a human.

      1 reply 0 retweets 0 likes
    8. Jon Pretty‏ @propensive 8 Nov 2019
      Replying to @posco @fanf42

      What's H? If they lie with probability 1, that's as good as telling the truth. And p = ½ gives no information. Ok, so let's assume the person from 2050 is omniscient enough to answer, "was reducing our emissions by X enough to save the planet?" And we have to pick X.

      2 replies 0 retweets 0 likes
    9. P. Oscar Boykin‏ @posco 8 Nov 2019
      Replying to @propensive @fanf42

      H is the usual name for Shannon Entropy: https://en.m.wikipedia.org/wiki/Entropy_(information_theory) … for a variable like this: -p*log(p)-(1-p)*log(1-p). Your formula is a well known upper bound on 1 - H(p).

      1 reply 0 retweets 1 like
      Jon Pretty‏ @propensive 8 Nov 2019
      Replying to @posco @fanf42

      Nice! Bedtime reading! ;)

      10:42 PM - 8 Nov 2019
      • 1 Like
      • P. Oscar Boykin
      0 replies 0 retweets 1 like

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