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vgr's profile
Venkatesh Rao
Venkatesh Rao
Venkatesh Rao
@vgr

Tweets

Venkatesh Rao

@vgr

Conversational account. For work follow @ribbonfarm, @breaking_smart, @artofgig. Tweets are 90% vacuous views, apathetically held. Mediocritopian. IKEA builder.

Los Angeles, CA
venkateshrao.com
Joined August 2007

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    1. Joscha Bach‏ @Plinz 17 Jun 2019
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      Things I wish I had learned at university: - measuring the efficiency of an algorithm in watts - difference between classical math and computation - relationship between geometry and number theory

      7 replies 13 retweets 92 likes
    2. Venkatesh Rao‏ @vgr 17 Jun 2019
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      Replying to @Plinz

      Are there systematic ways to do 1 formally based on Landeuer Principle or something?

      1 reply 0 retweets 2 likes
    3. Joscha Bach‏ @Plinz 17 Jun 2019
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      Replying to @vgr

      In practice it often depends on things like implementing your multiplication with a lookup table. I think the Landauer limit would matter if we did best effort computing and could harness the actual amount of determinism we can get from the substrate. We are far from that.

      1 reply 0 retweets 4 likes
    4. Venkatesh Rao‏ @vgr 17 Jun 2019
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      Replying to @Plinz

      I recall seeing some literature on a concept called “reversible computing” that seemed to be about this too. I guess that’s the synthesis side of power efficiency analysis.

      1 reply 0 retweets 2 likes
    5. Joscha Bach‏ @Plinz 17 Jun 2019
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      Replying to @vgr

      Reversible computing builds on the realization that entropy results from deleting bits. By building gates that permute bits only, you may be more efficient (but you'll still have to flush out the superfluous bits at some point). Best effort computing is largely unrelated.

      1 reply 0 retweets 4 likes
    6. Joscha Bach‏ @Plinz 17 Jun 2019
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      Replying to @Plinz @vgr

      You may really enjoy this short introduction to the ideas of Best Effort Computing by Steve Ackleyhttps://www.youtube.com/watch?v=I4flQ8XdvJM …

      2 replies 1 retweet 15 likes
    7. Dave Ackley‏ @livcomp 18 Jun 2019
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      Replying to @Plinz @joekina @vgr

      Or his brother Dave

      1 reply 0 retweets 7 likes
    8. Joscha Bach‏ @Plinz 18 Jun 2019
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      Replying to @livcomp @joekina @vgr

      omg sorry!!!

      1 reply 0 retweets 1 like
    9. Dave Ackley‏ @livcomp 18 Jun 2019
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      Replying to @Plinz @joekina @vgr

      Thanks for spreading the word!

      1 reply 0 retweets 3 likes
      Venkatesh Rao‏ @vgr 18 Jun 2019
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      Replying to @livcomp @Plinz @joekina

      That was very interesting. Do you have thoughts on actually cashing out the robustness gains via design of cheap+crappy chips that can be composed to deliver the performance/endurance of more expensive ones?

      11:44 AM - 18 Jun 2019
      4 replies 0 retweets 1 like
        1. no_defects‏ @no_defects 18 Jun 2019
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          Replying to @vgr @livcomp and

          unsure about the performance possibilities but I think it's more focused on antifragility—in one example he shows introducing a virus and then a kind of white blood cell. the other benefit is that you can build really big systems that might be partially distributed

          0 replies 0 retweets 1 like
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        2. no_defects‏ @no_defects 18 Jun 2019
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          Replying to @vgr @livcomp and

          the more I dig into this stuff the more I feel like it's what blockchain should actually be

          1 reply 1 retweet 2 likes
        3. no_defects‏ @no_defects 18 Jun 2019
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          Replying to @no_defects @vgr and

          eg, instead of depending on mathematical proofs that can have security holes and only have guarantees when certain assumptions are met (51% power held by good actors), you have a system that can recover from attacks and can evolve for more uses

          1 reply 0 retweets 1 like
        4. Show replies
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        2. Dave Ackley‏ @livcomp 18 Jun 2019
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          Replying to @vgr @Plinz @joekina

          I have daydreams, but mainly, if we can make the big step of shifting the hardware-software contract from determinism to best effort, then the chip folk will absolutely optimize cheap+crappy for us.

          1 reply 0 retweets 1 like
        3. Joscha Bach‏ @Plinz 18 Jun 2019
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          Replying to @livcomp @vgr @joekina

          Your ideas have put a number of thoughts in my mind. For instance, what is the smallest probabilistic compositional reward optimizer? What priors should it get for compositional self organization? Does it work better with centralized infrastructure that spawns an architecture?...

          1 reply 0 retweets 0 likes
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        2. Maynard Handley‏ @handleym99 18 Jun 2019
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          Replying to @vgr @livcomp and

          To run arbitrarily close to the efficiency limit you have to run arbitrarily slowly. That’s a problem... Second problem is that you become ever more susceptible to thermal noise. In principle ECC fixes this — at ever growing complexity.

          2 replies 0 retweets 1 like
        3. Maynard Handley‏ @handleym99 18 Jun 2019
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          Replying to @handleym99 @vgr and

          These two are painful enough that the theoretical limits are basically interesting as a “will never be exceeded” but not as a design target for CPUs as we use them today.

          0 replies 0 retweets 1 like
        4. End of conversation

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