Karen Ullrich (s/h) ✈️ COLM
karen-ullrich.bsky.social
Karen Ullrich (s/h) ✈️ COLM
@karen-ullrich.bsky.social
Research scientist at FAIR NY ❤️ LLMs + Information Theory. Previously, PhD at UoAmsterdam, intern at DeepMind + MSRC.
Pinned
#Tokenization is undeniably a key player in the success story of #LLMs but we poorly understand why.
I want to highlight progress we made in understanding the role of tokenization, developing the core incidents and mitigating its problems. 🧵👇
Reposted by Karen Ullrich (s/h) ✈️ COLM
One can manipulate LLM rankings to put any model in the lead—only by modifying the single character separating demonstration examples. Learn more in our new paper arxiv.org/abs/2510.05152
w/ Jingtong Su, Jianyu Zhang, @karen-ullrich.bsky.social , and Léon Bottou.
🧵
October 9, 2025 at 2:32 PM
Y’all, I am at #COLM this week, very excited to learn, and meet old and new friends. Please reach out on Whova!
October 6, 2025 at 10:40 PM
How would you make an LLM "forget" the concept of dog — or any other arbitrary concept? 🐶❓

We introduce SAMD & SAMI — a novel, concept-agnostic approach to identify and manipulate attention modules in transformers.
July 8, 2025 at 1:49 PM
Aligned Multi-Objective Optimization (A-🐮) has been accepted at #ICML2025! 🎉
We explore optimization scenarios where objectives align rather than conflict, introducing new scalable algorithms with theoretical guarantees. #MachineLearning #AI #Optimization
May 1, 2025 at 7:19 PM
🎉🎉 Our paper just got accepted to #ICLR2025! 🎉🎉

Byte-level LLMs without training and guaranteed performance? Curious how? Dive into our work! 📚✨

Paper: arxiv.org/abs/2410.09303
Github: github.com/facebookrese...
January 22, 2025 at 8:57 PM
Thursday is busy:
9-11am I will be at the Meta AI Booth
12.30-2pm
Mission Impossible: A Statistical Perspective on Jailbreaking LLMs (neurips.cc/virtual/2024...)
OR
End-To-End Causal Effect Estimation from Unstructured Natural Language Data (neurips.cc/virtual/2024...)
NeurIPS Poster Mission Impossible: A Statistical Perspective on Jailbreaking LLMsNeurIPS 2024
neurips.cc
December 12, 2024 at 4:29 PM
Starting with Fei-Fei Li’s talk 2.30, after that I will mostly be meeting people and wonder the poster sessions.
December 11, 2024 at 7:39 PM
Folks, I am posting my NeurIPS schedule daily in hopes to see folks, thanks @tkipf.bsky.social for the idea ;)

11-12.30 WiML round tables
1.30-4 Beyond Decoding, Tutorial
December 10, 2024 at 7:39 PM
I will be at #Neurips2024 next week to talk about these two papers and host a workshop on #NeuralCompression.
🎉 Exciting News! 🎉
Two papers have been accepted at #NeurIPS2024 ! 🙌🏼 These papers are the first outcomes of my growing focus on LLMs. 🍾 Cheers to Nikita Dhawan and Jingtong Su + all involved collaborators: @cmaddis.bsky.social Leo Cotta, Rahul Krishnan, Julia Kempe
December 6, 2024 at 4:57 PM
Pro-tip: Use massive black Friday deals at scientific publishing houses to for example buy a copy of @jmtomczak.bsky.social
book on generative modeling (long overdue)
November 28, 2024 at 3:49 PM
#Tokenization is undeniably a key player in the success story of #LLMs but we poorly understand why.
I want to highlight progress we made in understanding the role of tokenization, developing the core incidents and mitigating its problems. 🧵👇
October 30, 2024 at 6:26 PM
🚨 Internship Opportunity at FAIR NY 🚨

I got one PhD internship position available for 2025!

Interested in exploring the intersection of information theory, probabilistic reasoning, and LLMs?

📩 Send me a DM with your CV, website, and GScholar profile by October 14th.
September 30, 2024 at 2:45 PM
🎉 Exciting News! 🎉
Two papers have been accepted at #NeurIPS2024 ! 🙌🏼 These papers are the first outcomes of my growing focus on LLMs. 🍾 Cheers to Nikita Dhawan and Jingtong Su + all involved collaborators: @cmaddis.bsky.social Leo Cotta, Rahul Krishnan, Julia Kempe
September 26, 2024 at 6:02 PM
Deadline for the #neurips2024 workshop on #InformationTheory and #Compression approaching soon!

Submit by September 30th. More info
neuralcompression.github.io/workshop24
Neural Compression | Workshop 2024
A venue for all things ML ∩ compression.
neuralcompression.github.io
September 23, 2024 at 7:13 PM