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Plinz's profile
Joscha Bach
Joscha Bach
Joscha Bach
@Plinz

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Joscha Bach

@Plinz

FOLLOWS YOU. Artificial Intelligence, Cognitive Architectures, Computation. The goal is integrity, not conformity.

San Francisco, CA
bach.ai
Joined April 2009

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    Joscha Bach‏ @Plinz 19 Jun 2018
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    Joscha Bach Retweeted sol

    A continuous hypercomputer could solve the halting problem, which would lead to a paradox. That seems to imply that hypercomputation is not theoretically possible and the universe must therefore be discrete?https://twitter.com/fire__exit/status/1009256131624128512 …

    Joscha Bach added,

    sol @fire__exit
    dude what pic.twitter.com/8Bu60rmsUN
    Show this thread
    8:07 PM - 19 Jun 2018
    • 1 Retweet
    • 20 Likes
    • Mike Czech Jason McCandless Jeff LaPorte Ben Swanson Joshua Smith Evan O'Leary Gene Linetsky sol Salvator R. Tarnmoor
    7 replies 1 retweet 20 likes
      1. New conversation
      2. Carlos E. Perez‏ @IntuitMachine 20 Jun 2018
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        Replying to @Plinz

        The current paradox is: Why can you evolve differential computing but not be able to do as well with discrete computing? Why does evolutionary methods not work as well as gradient descent in learning?

        1 reply 0 retweets 2 likes
      3. Joscha Bach‏ @Plinz 20 Jun 2018
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        Replying to @IntuitMachine

        Why is that a paradox? Directed search is going to be more efficient than undirected search. Large search spaces are often only tractable when you discover and exploit gradients.

        1 reply 0 retweets 0 likes
      4. 14 more replies
      1. New conversation
      2. bowser‏ @browserdotsys 19 Jun 2018
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        Replying to @Plinz

        this argument doesn't work because hypercomputers aren't Turing machines – so the standard halting contradiction proof fails since you can't simulate a hypercomputer on a TM

        3 replies 0 retweets 5 likes
      3. bowser‏ @browserdotsys 19 Jun 2018
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        Replying to @browserdotsys @Plinz

        you might be interested in reading about what happens when you augment a TM with an oracle that can magically decide the halting problem though – the new machine will have its own halting problem! and you get the arithmetical hierarchy https://en.wikipedia.org/wiki/Arithmetical_hierarchy#Relation_to_Turing_machines …

        1 reply 0 retweets 0 likes
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      2. Ivan Aksamentov‏ @ivan_aksamentov 20 Jun 2018
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        Replying to @Plinz

        Also, so far, Universe seems to be discreet anyway? (as in quantum physics)

        1 reply 0 retweets 0 likes
      3. Joscha Bach‏ @Plinz 20 Jun 2018
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        Replying to @ivan_aksamentov

        Yes, but most of current physics is built on continuous foundations and assumes that the observed discreteness is an emergent result of wave harmonics.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Francesca Pallopides‏ @FPallopides 20 Jun 2018
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        Replying to @Plinz

        Wait you're saying we're not yet sure the universe is discrete? I thought that was pretty much established since the 90s? 🤔

        1 reply 0 retweets 0 likes
      3. Joscha Bach‏ @Plinz 20 Jun 2018
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        Replying to @FPallopides

        No, digital physics is still fringe. Even QM is not time discrete.

        1 reply 0 retweets 1 like
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      1. sol‏ @fire__exit 19 Jun 2018
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        Replying to @Plinz

        sol Retweeted bowser

        this plus https://twitter.com/browserdotsys/status/1009272621500960768 … have soothed me

        sol added,

        bowser @browserdotsys
        Replying to @fire__exit
        section 6 here is a pretty solid rebuttal imo https://www.scottaaronson.com/papers/npcomplete.pdf …
        0 replies 0 retweets 1 like
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