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AdamMarblestone's profile
Adam Marblestone
Adam Marblestone
Adam Marblestone
@AdamMarblestone

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Adam Marblestone

@AdamMarblestone

Technologist, Scientist

adammarblestone.org
Joined February 2009

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    1. KordingLab  👨‍💻 🧠∇ 🔬 📈, 🏋️‍♂️ ⛷️ 🏂 🛹 🕺 ⛰️ ☕ 🦖‏ @KordingLab 30 Nov 2019
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      I think that the brain almost certainly approximates gradient descent. And here is why: Any learning episode only appears to change the brain a tiny bit. 1/5

      41 replies 81 retweets 319 likes
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    2. KordingLab  👨‍💻 🧠∇ 🔬 📈, 🏋️‍♂️ ⛷️ 🏂 🛹 🕺 ⛰️ ☕ 🦖‏ @KordingLab 30 Nov 2019
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      Given that the brain appears to be quite noisy and somewhat linear, this means that we can almost certainly locally approximate the task loss L linearly around the starting parameters W_0 as L(W_0+ΔW)≈L(W_0 )+ΔW ∇L(W) 2/5

      8 replies 0 retweets 27 likes
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    3. Ken Miller‏ @kendmil 30 Nov 2019
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      Replying to @KordingLab

      Konrad you're somewhat begging the Q by assuming there is A task with A well-defined loss function. How that formalism relates to messy experience is one fundamental Q. Also, do you think one-shot learning - remembering a whole moment & all its elements- is a small change?

      2 replies 0 retweets 10 likes
    4. KordingLab  👨‍💻 🧠∇ 🔬 📈, 🏋️‍♂️ ⛷️ 🏂 🛹 🕺 ⛰️ ☕ 🦖‏ @KordingLab 1 Dec 2019
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      Replying to @kendmil

      I guess I was socialized as a movement scientist :) but yes, episodic memory poorly fits into framework.

      1 reply 0 retweets 3 likes
      Adam Marblestone‏ @AdamMarblestone 2 Dec 2019
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      Replying to @KordingLab @kendmil

      Yeah, Krad, u seem to suggest ALL areas of brain would ~do GD? How do u square that w/ what we wrote in 2016, as a hypothesis: some areas may do ~GD on useful loss fxns like prediction min., or more bespoke losses -- but others are "specialized structures", e.g., episodic memory.

      2:57 AM - 2 Dec 2019
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      • Niclas Samuelsson Weinan Sun José G. Almeida KordingLab 👨‍💻🧠∇🔬📈,🏋️‍♂️⛷️🏂🛹🕺⛰️☕🦖 jovo
      1 reply 0 retweets 5 likes
        1. KordingLab  👨‍💻 🧠∇ 🔬 📈, 🏋️‍♂️ ⛷️ 🏂 🛹 🕺 ⛰️ ☕ 🦖‏ @KordingLab 2 Dec 2019
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          Replying to @AdamMarblestone @kendmil

          Obviously not all. Just on average. Just playing with how to communicate that gd is a generally useful principle. One of many.

          0 replies 0 retweets 2 likes
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