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Rachel Thomas

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@math_rachel

R&D at answer ai | fast ai co-founder | past: math PhD, immunology MS, early eng at uber, prof at USF Data Institute
Brisbane, Australia rachel.fast.ai Joined May 2013
920 Following 93K Followers 10K Posts

Latest posts 5

Rachel Thomas Verified account @math_rachel
"When two things are different, you should not use one to mimic the other. It would've been a colossal mistake if Phil Jackson had pushed Jordan to mimic Pippen & Rodman.

"The same applies to AI & human skills. Using AI to expand what humans do is more productive" @DAcemogluMIT
Rachel Thomas Verified account @math_rachel
"The question is whether most tasks in the economy are like chess, where there is a clear performance metric that can be optimized, or whether they’re like writing, where quality is a multidimensional balancing act without clear training signals beyond human mimicry."
Arvind Narayanan Verified account @random_walker Oct 29
What would the writing of superintelligent AI sound like? You might expect it to have the characteristics of good human writing — figurative language, high information density, coining new terms, and punchiness — but dialed up to 11. Well, that’s what Claude did, until Anthropic dialed it back recently because of user complaints. It didn’t sound superintelligent to most of us. Instead, the neuralese writing style sounds like a “stupid person’s idea of a smart person”.

Our response to information density and metaphor-laden writing looks something like the cartoon graph I've drawn. Beyond a point, it completely backfires. The reason human writers don’t overdo it isn’t because they aren’t capable, but because they are aware of the reader’s cognitive burden. One of the hardest skills to learn as a writer is to simulate the reader’s experience.

It’s easy to train AI to mimic mediocre human writing. But optimizing it to be (perceived as) good is really hard, and made much harder by the fact that when everyone uses the same few AI models we get tired of their tics very quickly. Most Claudeisms are individually pretty good. I hate that I can’t use “load bearing” in my writing any more. If it weren’t for AI overuse it would be a neat metaphor.

A broader question is whether most tasks in the economy are like chess, where there is a clear performance metric that can be optimized, or whether they’re like writing, where quality is a multidimensional balancing act without clear training signals beyond human mimicry.
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Rachel Thomas Verified account @math_rachel
- Does a tech intervention result in more trouble or harm than it’s meant to address?
- Could it be replaced by an equally viable low- or non-tech approach?
- Does it solve a computationally tractable transformation of a problem rather than the problem itself?
Praveen Kumar Verma Verified account @Alacritic_Super Oct 25
Purdue University's IDEAS Lab built an autonomous drone that tracks runners through dense forests completely without GPS or cloud networks.

By running 3D LiDAR mapping and obstacle-avoidance AI entirely on-chip, it can weave under tree canopies and predict target movement through blind spots in real time.

Massive implications for next-gen search & rescue and edge AI.
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