Zachary Lipton's Avatar

Zachary Lipton

@zacharylipton

Cofounder & CTO @ Abridge, Raj Reddy Associate Prof of ML @ CMU, occasional writer, relapsing 🎷, creator of d2l.ai & approximatelycorrect.com

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19.05.2023
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Latest posts by Zachary Lipton @zacharylipton

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πŸ’‘Can we trust synthetic data for statistical inference?

We show that synthetic data (e.g., LLM simulations) can significantly improve the performance of inference tasks. The key intuition lies in the interactions between the moment residuals of synthetic data and those of real data

10.10.2025 16:12 πŸ‘ 36 πŸ” 9 πŸ’¬ 2 πŸ“Œ 5

We’ll know he’s really made it when Alcatraz gets autocorrected to Alcaraz.

15.09.2025 06:04 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Small idiosyncratic language errors in otherwise clear technical papers are now a plus; assurance that I'm not wasting my time trying to read GPT spam. #neurips2025

05.07.2025 23:56 πŸ‘ 60 πŸ” 5 πŸ’¬ 2 πŸ“Œ 0

Spent the whole day reading unlearning papers. If any of the methods worked, I might hope to recover from the experience.

30.06.2025 07:33 πŸ‘ 9 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Final 5m of NBA games solved. If you foul:
β€’ opposing team gets 1 FT
β€’ & keeps possession w fresh 24
Next up, Israel/Palestine.

30.05.2025 01:42 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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10.05.2025 01:20 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Google miles behind Open/Anth til overnight boom 2.5.
Mosaic models underwrite $1B until boom mothballed.
Deepseek turns world upside down, but only for 5min.
The speed at which the winds turn here is truly wild.

10.05.2025 00:54 πŸ‘ 17 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
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What problem were airplane designers hoping to solve when they proposed this monstrosity?

06.05.2025 01:50 πŸ‘ 7 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

50M human hours have been spent adjusting airplane seats into upright position before takeoff, saving a grand total of 0 human lives

03.05.2025 03:34 πŸ‘ 16 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Unlike OpenAI, ostensibly controlled by a powerful holding entity, here have effectively 0 board power. This saga's shaping up like the Asimov's Spacer novels, but instead of each book exploring a different ratio of humans to robotic servants, it's a different level of corporate oversight.

30.04.2025 01:20 πŸ‘ 7 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Thinking Machines Lab CEO Has Unusual Control in Andreessen-Led Deal It’s common nowadays for founders of hot startups to hold special shares that give them more voting power than most investors. But Mira Murati, a former OpenAI chief technology officer who is now a fo...

OpenAI folks getting creative about corporate governance. I've seen this movie before...

www.theinformation.com/articles/thi...

30.04.2025 00:23 πŸ‘ 6 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1

We even found that sometimes with deep nets imputing 0 is better than running a fancy imputation algorithm because it’s more obvious which values are imputed so there’s less destruction of information.

23.04.2025 08:29 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Yeah, it makes sense, it gives you all the info you have. A powerful enough model can learn any reasonable imputation strategy implicitly.

23.04.2025 08:27 πŸ‘ 3 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

Taking me back to 2016 baby. proceedings.mlr.press/v56/Lipton16...

In some clinical tasks the indicators are so useful, they’re almost as informative as the features themselves.

23.04.2025 07:59 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

On my way to Singapore for #iclr2025. Excited to pop my head out of AI product development to get inspired, connect w the next generation of researchers, and also for food. hmu

23.04.2025 07:56 πŸ‘ 10 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Thus the β€œcontroversiality”. Point is, hard to imagine any non-political reason to get any other compact EV than a tesla. Seems like nobody is even close, which i found surprising given the growing market.

07.03.2025 06:20 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Controversial opinion. It’s impossible to lease an EV in the US that’s even half as good a deal as @Tesla model 3/Y.

07.03.2025 02:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

Plugin that automatically clicks thru "reject" to select "only strictly necessary" on the cookie pop-ups. πŸ’΅

28.02.2025 12:46 πŸ‘ 30 πŸ” 0 πŸ’¬ 3 πŸ“Œ 0

CTO’s the most slippery title in the world. Depending on the company, you’re either

1. A technical founder who never wanted to manage, now an IC engineer
2. A VP of Engineering
3. Leading all of EPD (+AI)
4. An influencer with no internal responsibilities

25.02.2025 14:37 πŸ‘ 14 πŸ” 1 πŸ’¬ 3 πŸ“Œ 0

what sort of model was involved in the retrieval step?

16.02.2025 23:30 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Just as the jaws of tetragenarianism are closing in, stole this W from the jaws of impending awardless decrepitude.

10.02.2025 14:43 πŸ‘ 9 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

...you’re thinking about infrastructure, user experience, orchestration, governance, and automation at scale. That’s a different game altogether."

07.02.2025 20:24 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

per ChatGPT:

"AI is no longer just β€œmachine learning at scale.” It’s a full-stack engineering and economic transformation, where ML is just one piece of the puzzle. If you’re building modern AI systems, you’re thinking beyond MLβ€”...

07.02.2025 20:24 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Phase 1 of my research career: "ML" = rebranding of the successful subset of AI.

Phase 2: "AI" = rebranding of the successful subset of ML.

Phase 3: AI & ML truly starting to diverge.

07.02.2025 20:24 πŸ‘ 12 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

Can't find any person or AI that can explain Luka β†’ Lakers. Only satisfying theory I can conjure: behind-the-scenes feud β†’ "calf strain" masking a relationship strain β†’ trade demand. But according to ChatGPT's research, Luka was blindsided by the trade.

03.02.2025 05:04 πŸ‘ 8 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0

Just another boring week in the AI capabilities landscape.

27.01.2025 16:28 πŸ‘ 14 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

How to **efficiently** build personalized language models **without** textual info on user preferences?

Our Personalized-RLHF work:
- light-weight user model
- personalize all *PO alignment algorithms
- strong performance on the largest personalized preference dataset

arxiv.org/abs/2402.05133

14.12.2024 17:02 πŸ‘ 12 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

First #runconference @neuripsconf.bsky.social #NeurIPS2024 was great! Will share tomorrow's deets later today, join us!
@zacharylipton.bsky.social @adamjelley.bsky.social @random-steve.bsky.social

10.12.2024 16:49 πŸ‘ 29 πŸ” 2 πŸ’¬ 2 πŸ“Œ 1

optimizing for inclusivity, pace depends on crowd, never crazy, maybe as fast as 8:00 miles, as slow as 10:00, depending on the crowd

09.12.2024 22:52 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0