Tiago Pimentel @tpimentelms
Postdoc at @ETH_en. Formerly, PhD student at @Cambridge_Uni. tpimentelms.github.io Brasília, Brazil Joined November 2009-
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And the recoding is now public: us06web.zoom.us/rec/play/84bxE…
at ACL Big Picture Workshop @amuuueller and @tpimentelms gave a great talk related to this 👇🏻
1/ If you have been reading about discrete diffusion, you might have asked yourself the following question: What does a discrete diffusion model actually learn? A denoiser? A concrete score? A bridge plug-in? The literature treats them as interchangeable. They are not! 🧵
at ACL Big Picture Workshop @amuuueller and @tpimentelms gave a great talk related to this 👇🏻
At mech interp workshop, thinking that many questions could just be studied behaviorally and that the interp part is like a nice add-on/icing Ofc, a lot of those are great Qs in general! And interp is fascinating, even as an add-on
this is going to be presented today at 10:30am @ hall A, poster #1904! see you there 🫡
first paper of the phd 🥳 the Superficial Alignment Hypothesis (SAH) argues that pre-training adds most of the knowledge to a model, and post-training merely surfaces it. however, this hypothesis has lacked a precise definition. we fix this.
Come hear about superficial alignment 🔥
this is going to be presented today at 10:30am @ hall A, poster #1904! see you there 🫡
Today + tomorrow I'm at @aclmeeting '26, and early this morning, I received the 2026 ACL Computational Linguistics Doctoral Dissertation Award!! 🙀🏆👩🎓It's the icing on the cake of my excellent PhD experience in Edinburgh @Edin_CDT_NLP @EdinburghNLP. (1/3)
Don't forget to attend the "ACL Computational Linguistics Doctoral Dissertation Award 2026" session on Mon Jul 6, 9:009:30 AM (Location: Promenade) in the "Session 8: Oral/Poster Session D" (1/2) #ACL2026NLP
@GoncaloSPaulo @aryaman2020 Fair point :) The full recording should be available soon-ish, I think, but I can also post a proper answer here tomorrow when I have more time! x.com/tpimentelms/st…
@_ThomasPF @aryaman2020 I think the full recordings will appear here in a few days: bigpictureworkshop.com Not sure how long that takes, but maybe @yanaiela knows?
If you're at #acl2026nlp, come to our talk today at the BigPicture workshop :)
After a coffee break, we'll resume with the second invited talk by @tpimentelms and @amuuueller (10:50) who prepared you a special co-talk: "Does mechanistic interpretability need interventions?"
@aryaman2020 And it's so close to Stanford this time 😅
@_ThomasPF @aryaman2020 I think the full recordings will appear here in a few days: bigpictureworkshop.com Not sure how long that takes, but maybe @yanaiela knows?
@aryaman2020 There's more than just the nonlinear representation dilemma :) It's a joint talk with Aaron, so we're discussing other limitations of mech interp (arguing mech interp is not always "sufficient"), and also cases where you don't need to go mechanistic (when it is not "necessary")
@aryaman2020 Will people not come if I send you the final slide before the talk? 🤔
New experiment: does talking about an AI system in anthropomorphic terms (for example, saying that it "thinks" or "knows" something) affect people's perception of the system? Quite possible not. arxiv.org/abs/2606.29121
I will be at #ICML2026 🇰🇷 presenting three papers on interpretability and model adaptation. Feel free to reach out if you want to chat! 🙂 P.S. I'm looking for motivated students to join my new group at Saarland University 🇩🇪: mariusmosbach.com/group/
Can we normalise lazy reviews for lazy papers? If you didn't take the time to write your paper(and used an LLM for it), why should I take the time to review it? 😓
Effective language identification based on a tokenizer UnigramLM tokenizer already gives probabilities, testing those to identify a language is fast and effective. Whiceh leads me to wonder, can we identify language during training and affect behavior?
🚨 I’m happy to share that I'm joining Saarland University as a tenure-track Professor in the Department of Language Science and Technology, and the German Research Center for AI (@DFKI) as a Scientific Director, starting October 2026! 🚨 1/6
📢 We're hiring a PhD student in tokenizer-free foundation models! The position will have a double affiliation with @LMU_Muenchen and @utn_nuremberg, co-supervised by @y_m_asano and me. Come work with us in Munich and Nuremberg! 👇
Related to @janallant's recent linear-programming-based tokenisation paper: x.com/janallant/stat…
In our new paper, we reinterpret tokenisation as a problem in high-dimensional geometry (100M dims to be precise!), which we can solve efficiently to get a globally near-optimal tokeniser! Our method consistently improves language models over BPE. See 🧵for details.
Super cool blog post!
Blog post about my recent optimal tokenizer exploration blog.aqnichol.com/2026/06/10/opt…
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