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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 14 Apr 2020

      Casey Muratori Retweeted Stephen Wolfram

      So, I read this entire post, but the entire thing just sums up to "we think someday we could make a context-free grammar for the universe". Since they _haven't_ yet, I'm not sure what the proposed value-add is here?https://twitter.com/stephen_wolfram/status/1250063808309198849 …

      Casey Muratori added,

      Stephen WolframVerified account @stephen_wolfram
      I never expected this: finally we may have a path to the fundamental theory of physics...and it's beautiful https://writings.stephenwolfram.com/2020/04/finally-we-may-have-a-path-to-the-fundamental-theory-of-physics-and-its-beautiful/ … pic.twitter.com/IVvx8F97SQ
      9 replies 8 retweets 48 likes
      Show this thread
    2. Casey Muratori‏ @cmuratori 14 Apr 2020

      Like there are literally stacks of papers in the computer graphics literature that have precisely these kinds of algorithms their proposing here. We've done this, done this, done this, and done it again over and over. What is the actual contribution supposed to be here?

      5 replies 0 retweets 14 likes
      Show this thread
    3. This Tweet is unavailable.
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    5. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @Jonathan_Blow

      If you go back to the original L-systems paper, it is literally this same thing. They said "we want to simulate cell growth in plants", and they worked on rules until they got something that mirrored observations.

      2 replies 0 retweets 3 likes
    6. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      This is an unsurprising result in hindsight, right, because with a context-free grammar for replacements is fairly powerful. You can create rules which will result in a wide variety of input sets.

      1 reply 0 retweets 2 likes
    7. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      But saying that it is "the way the universe works" or something is very bizarre, because although, for example, MPEG-4 can use a seemingly bizarre set of codes to magically reproduce what appears to be an exact visual representation of the world, it's _not_ how the world "works".

      4 replies 0 retweets 13 likes
    8. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      So sure - context free geometry replacement grammars can be used to compress all sorts of natural phenomenon into some simple rules so long as you accept a number of constraints, but they don't really add any insight to what we already know.

      2 replies 0 retweets 7 likes
    9. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      They're a compression format for rules, might be another way to say it, and they're also probably lossy. Since context-free grammars _also_ have all sorts of limitations, it also seems likely that they cannot explain the universe properly, otherwise they would work better :)

      2 replies 0 retweets 5 likes
      Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      Anyway, Twitter is not great at explaining this, but hopefully that is the basic gist. So this just seems like another case of Wolfram "rediscovering" something we've known for like 60 years and thinking he made a breakthrough.

      10:56 AM - 14 Apr 2020
      • 8 Likes
      • Scott Lee 🎮 🎄 Rytis Hal Wayland Alex Hunsley Leon T an argument for the pit Joshua Silva
      3 replies 0 retweets 8 likes
        1. Joshua Silva‏ @silvascientist 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          Yes, I'm pretty sure that's exactly what this is

          0 replies 0 retweets 0 likes
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        2. Casey Muratori‏ @cmuratori 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          In this case, it's the work of Aristid Lindenmayer and descendants - which he notably fails to mention in the entire post. Which is another really big clue to me that this is not something new, because if they were diligently researching this, they would mention the prior work!

          1 reply 0 retweets 6 likes
        3. Casey Muratori‏ @cmuratori 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          Like half the things he said in the blog post are already _in_ Lindenmayer's stuff or his work with Prusinkiewicz, etc. And that's not even counting the new stuff that is actually more advanced than CFGs done by people in the past decade (for things like city generation).

          2 replies 0 retweets 3 likes
        4. Show replies
        1. New conversation
        2. Zdeněk Gromnica‏ @FutureMillenniu 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          I'd love to hear you expand on this! Perhaps an unprepared video rant? :-)

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 14 Apr 2020
          Replying to @FutureMillenniu @Jonathan_Blow

          Not much to say. Graphs can effectively encode anything we can encode, because they contain both things (edge existence is discrete and edge lengths are continuous). It is not "interesting" to me to say that you can create graph encodings of any specific thing, because of course.

          1 reply 0 retweets 1 like
        4. Show replies

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