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Jindřich Libovický

@jlibovicky.bsky.social
571 followers 260 following 60 posts

Researcher at Charles University | multilingual natural language processing, machine translation

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Jindřich Libovický @jlibovicky.bsky.social · 12h
ACL announcing the deadline for ACL 2027...
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Jindřich Libovický @jlibovicky.bsky.social · 21/09/2026
I really enjoyed giving a talk at the Machine Translation Marathon 2026 about our research on tokenization evaluation. Thank you for having me! For those interested, the slides from my presentation are available here: docs.google.com/presentation...
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Jindřich Libovický @jlibovicky.bsky.social · 02/09/2026
Very happy to share that Adnan Al Ali's first big PhD project has been accepted to #EMNLP2026! 🎉 Joint work with @kathaem.bsky.social, me & Alex Fraser. Paper: arxiv.org/abs/2608.03446 What predicts multilingual LLM performance in a language? 🧵
arxiv.org
Predicting Multilingual Classification and Translation Performance of LLMs with Cross-Lingual Alignment -- Is English Enough?
Multilingual large language models (LLMs) have been shown to perform better on non-English classification tasks when the representations of the given language are more aligned to English within the mo...
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Jindřich Libovický @jlibovicky.bsky.social · 07/07/2026
Very proud of my student Lukáš Eigler presenting this at the ACL Student Research Workshop. TL;DR: you can validate NLP evaluation metrics with synthetic LLM judgments — the rankings track human ones almost perfectly. 📄 aclanthology.org/2026.acl-srw.125
aclanthology.org
LLM as a Meta-Judge: Synthetic Data for NLP Evaluation Metric Validation
Lukáš Eigler, Jindřich Libovický, David Hurych. Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 4: Student Research Workshop). 2026.
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Jindřich Libovický @jlibovicky.bsky.social · 06/07/2026
Dušan made something like TensorBoard for tokenization 📊 Token length, entropy, vocab overlap, JS divergence, alignment scores: sliced by language family, script, region, speakers, data availability. 🔗 Code: github.com/ufal/TokCollate 🔗 Demo: quest.ms.mff.cuni.cz/tokcollate
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Jindřich Libovický @jlibovicky.bsky.social · 02/07/2026
AC observation this ARR cycle: I'm getting way more reviews and way earlier, than usual. I suspect it's the draconian desk-reject threats working, and not a sign of better reviewing culture. I worry that this gets read as 'threats work, do more of them, discipline the lazy researchers'.
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Reposted by Jindřich Libovický
Tokenization Workshop (TokShop) @COLM2026 @tokshop.bsky.social · 23/06/2026
📣 TokShop 2026 deadline extended! 🗓️ New submission deadline: Friday, June 26, 2026 (AoE) Research papers (up to 9 pages) and extended abstracts (up to 2 pages) are welcome. Submit: openreview.net/group?id=col... More info: tokenization-workshop.github.io
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Jindřich Libovický @jlibovicky.bsky.social · 15/06/2026
Is "Je to obrovský problém, tvrdí české ministerstvo obrany." Czech or Slovak? Both. Language ID systems must pick one: and that's just one way they break. Our new benchmark CHALIS exposes how fragile they really are. 📄 arxiv.org/abs/2606.06088 🤗 huggingface.co/datasets/michal-tichy/CHALIS
arxiv.org
CHALIS: A Challenge Dataset for Language Identification in Difficult Scenarios
We present CHALIS (Challenging Language Identification Samples), a new benchmark dataset explicitly designed to address difficult cases in language identification: cousin languages and orthographic no...
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Jindřich Libovický @jlibovicky.bsky.social · 09/06/2026
Lukáš Eigler defended his thesis (co-supervised with David Hurych, @valeoai.bsky.social) 🎉 Congrats! #NLP metric validation needs 🐌💰 human judgment data. Our fix: generate synthetic data for metric validation. ✅ Tested on MT, QA, summarization. To appear #ACL2026 SRW: arxiv.org/abs/2603.09403
arxiv.org
LLM as a Meta-Judge: Synthetic Data for NLP Evaluation Metric Validation
Validating evaluation metrics for NLG typically relies on expensive and time-consuming human annotations, which predominantly exist only for English datasets. We propose LLM as a Meta-Judge, a scalabl...
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Jindřich Libovický @jlibovicky.bsky.social · 05/06/2026
I have to grade 200+ ML exams/year. To survive, I coded a bunch of tools: unique exam generation, handwriting recognition, and per-question stats. Check out the details on my blog. 📊 jlibovicky.github.io/2026/06/04/G...
jlibovicky.github.io
How I grade 200 exams every year
Three years ago, I took the introductory machine learning course over from Milan Straka, and one of the problems I had to deal with was: how do I grade 250 written exams without it consuming my entire...
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Jindřich Libovický @jlibovicky.bsky.social · 22/05/2026
Send your work to TokShop! tokenization-workshop.github.io
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Jindřich Libovický @jlibovicky.bsky.social · 14/05/2026
TokShop is happening again!
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Jindřich Libovický @jlibovicky.bsky.social · 30/03/2026
Nice work by my student @gianlucavico.bsky.social on a topic close to home: crowdsourcing Piedmontese to test LLMs on non-standard orthography. New dataset covering tokenization, classification & translation.
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Reposted by Jindřich Libovický
Institute of Formal and Applied Linguistics @ufal.mff.cuni.cz · 28/03/2026
On the Credibility of Evaluating LLMs using Survey Questions by @jlibovicky.bsky.social aclanthology.org/2026.mme-mai... Survey-based LLM value evals are unreliable — prompting & decoding choices skew results drastically.
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Jindřich Libovický @jlibovicky.bsky.social · 26/03/2026
So proud of my new PhD student Adnan Al Ali for presenting their master's thesis work at EACL! 🎓 A great contribution to understanding bias in AI text detectors across languages.
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Jindřich Libovický @jlibovicky.bsky.social · 26/03/2026
I'm at #EACL2026 in Rabat 🇲🇦. Find me and talk to me about tokenization or multilingual model eval. Also, check out our work on how to eval morphological plausibility of your tokenizer if you don't have gold segmentation data, but you happen to have morphosyntactic features 👇
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Jindřich Libovický @jlibovicky.bsky.social · 20/03/2026
Thanks for organizing this! I am definitely coming, and everyone interested in tokenization at #EACL2025 should too. 🫵
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Jindřich Libovický @jlibovicky.bsky.social · 09/03/2026
3rd run teaching ML to 250+ bachelor students (with great materials originaly by @straka-milan.bsky.social). Core philosophy: explain the math, implement algorithms from scratch, Kaggle-style competitions, all auto-graded. ufal.mff.cuni.cz/courses/npfl... But look what LLMs did to the course 👇
ufal.mff.cuni.cz
Introduction to Machine Learning with Python | ÚFAL
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Jindřich Libovický @jlibovicky.bsky.social · 04/03/2026
Spent time making AI-generated images of Bayes' Rule, Laplace Smoothing, Markov Chains & Shannon Entropy for class today 🎨🤖 Even though the images are objectively hilarious, none of the 50 students in the room laughed. Or even smiled. 💀
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Jindřich Libovický @jlibovicky.bsky.social · 16/02/2026
I reviewed papers evaluating LLM values using sociology questionnaires. Different methods, different results. Didn't trust them, so I tested it myself. Methodology matters. Short answers vs CoT, squared err vs KL div.: each changes which populations an LLM "aligns" with. www.arxiv.org/pdf/2602.04033
arxiv.org
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Jindřich Libovický @jlibovicky.bsky.social · 03/02/2026
We have updated the pre-print on CUS-QA, benchmark for regional knowledge about Czechia, Slovakia and Ukraine arxiv.org/abs/2507.22752 Now, there are results of retrieval-augmented generation and more detailed analysis of model performance depending on the topic of the question or visual context.
arxiv.org
CUS-QA: Local-Knowledge-Oriented Open-Ended Question Answering Dataset
We introduce CUS-QA, a benchmark for evaluation of open-ended regional question answering that encompasses both textual and visual modalities. We also provide strong baselines using state-of-the-art l...
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Jindřich Libovický @jlibovicky.bsky.social · 02/02/2026
We (= mostly @abyste.bsky.social) developed a way to evaluate how morphological a #tokenization is w/o gold segmentation labels. arxiv.org/abs/2601.18536 The key: align subword tokens with morphological features from UniMorph using IBM Model 1. To appear in EACL 2026 Findings.
arxiv.org
Evaluating Morphological Plausibility of Subword Tokenization via Statistical Alignment with Morpho-Syntactic Features
We present a novel metric for the evaluation of the morphological plausibility of subword segmentation. Unlike the typically used morpheme boundary or retrieval F-score, which requires gold segmentati...
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Jindřich Libovický @jlibovicky.bsky.social · 23/12/2025
Happy holidays! 🎄🎅🤩🎁
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Jindřich Libovický @jlibovicky.bsky.social · 10/11/2025
Attenzione! 🇮🇹 Know Piedmontese or Neapolitan speakers? @gianlucavico.bsky.social is collecting crowd-sourced translations to evaluate LLM performance on these regional languages. Partecipate!
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Jindřich Libovický @jlibovicky.bsky.social · 21/10/2025
With @andrei-a-manea.bsky.social, we posted a survey on multilingual vision-language models 👉 arxiv.org/pdf/2509.22123 We reviewed 31 models+21 benchmarks. There's a tension between language neutrality (same results across languages) & cultural awareness (context matters differently across cultures)
arxiv.org
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Jindřich Libovický @jlibovicky.bsky.social · 01/09/2025
So proud of my PhD student @andrei-a-manea.bsky.social for his first first-author publication! 🎉 He presented this work last week at TSD. Investigating the Effect of Parallel Data in the Cross-Lingual Transfer for Vision-Language Encoders arxiv.org/pdf/2504.21681
arxiv.org
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Jindřich Libovický @jlibovicky.bsky.social · 25/08/2025
🧵 We're releasing CUS-QA - a new benchmark for testing LLMs on regional knowledge! Find out what your model knows about Czechia 🇨🇿, Slovakia 🇸🇰, and Ukraine 🇺🇦! 👉 Textual and visual questions, answers, and human judgment on model outputs! huggingface.co/datasets/ufa... www.arxiv.org/abs/2507.22752
huggingface.co
ufal/cus-qa · Datasets at Hugging Face
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
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Jindřich Libovický @jlibovicky.bsky.social · 01/08/2025
Stay tuned, we will release the dataset soon...
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Reposted by Jindřich Libovický
Jindra Helcl @jindrahelcl.bsky.social · 29/07/2025
We need to have poster fights at the end of every conference.
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Jindřich Libovický @jlibovicky.bsky.social · 28/07/2025
Just presented MAGBIG, a new dataset and evaluation methodology for gender bias in multilingual text-to-image generation. Grammatical gender matters when studying these biases across languages! Thanks to Felix Friedrich, @kathaem.bsky.social and all co-authors - it was fun to work on this together!
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Jindřich Libovický @jlibovicky.bsky.social · 27/07/2025
This week I am at #ACL2025NLP in Vienna 🎡🇦🇹. Find me 🕵️ or message 💌 me if you want to chat about multilinguality or tokenization. Stop 🛑 by our poster on gender bias in text-to-image generation on Monday aclanthology.org/2025.acl-lon...
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Reposted by Jindřich Libovický
Tokenization Workshop (TokShop) @COLM2026 @tokshop.bsky.social · 02/06/2025
TokShop @ #ICML2025 got way more submissions than expected! 📈 We could really use a few more reviewers to help out. If you have the capacity to review a #tokenization paper by Saturday, please fill out this form: forms.gle/32A6sQHQrMSb... 🙏
forms.gle
TokShop 2025
Registering interest in all things tokenization at TokShop @ ICML 2025 (July 18) Consider joining the Google group for future updates! https://groups.google.com/g/tokshop
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Reposted by Jindřich Libovický
Tokenization Workshop (TokShop) @COLM2026 @tokshop.bsky.social · 14/05/2025
📣 Call for Paper Alert: TokShop @ ICML 2025 TokShop explores tokenization across all data modalities. Topics include: subword NLP techniques, multimodal approaches, multilingual challenges, post-training modification, alternative representations, and statistical perspectives.
openreview.net
ICML 2025 Workshop TokShop
Welcome to the OpenReview homepage for ICML 2025 Workshop TokShop
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Reposted by Jindřich Libovický
Tokenization Workshop (TokShop) @COLM2026 @tokshop.bsky.social · 04/05/2025
Got a tokenization paper that just didn't make the cut for ICML? Submit it to the Tokenization Workshop TokShop at #ICML2025 -- we'd love to see it there! tokenization-workshop.github.io
tokenization-workshop.github.io
Tokenization Workshop @ ICML 2025
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Jindřich Libovický @jlibovicky.bsky.social · 30/04/2025
Attending #NAACL2025 virtually. Since 2022, I've been training a classifier on papers I read to tackle the arXiv madness. Ran it on the NAACL proceedings for my personalized watch list. 🤓📺 However, it's far from perfect: Multilingual cultural awareness is great, but where is tokenization? 🤷
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Jindřich Libovický @jlibovicky.bsky.social · 15/04/2025
We're organizing ✨Tokenization Workhop✨ TokShop❗ Join us at @icmlconf.bsky.social in July in Vancouver 🇨🇦. Follow @tokshop.bsky.social for updates! Submit your paper by May 30.
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Jindřich Libovický @jlibovicky.bsky.social · 04/04/2025
Random take on the #TuringTest: Rather than testing machine intelligence, it can be a measure of societal awareness about #AI capabilities. The real objective isn't creating a machine that passes but educating people to think critically and avoid being deceived, so the machines do not pass the test.
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Jindřich Libovický @jlibovicky.bsky.social · 02/04/2025
Summaries of pre-prints that I noticed and liked on arXiv in March are now on my blog jlibovicky.github.io//2025/04/02/...
jlibovicky.github.io
Highlights from Machine Translation and Multilinguality in March 2025
EuroBERT: Scaling Multilingual Encoders for European Languages
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Jindřich Libovický @jlibovicky.bsky.social · 10/03/2025
Our paper 'Beyond Literal Token Overlap: Token Alignability for Multilinguality' will be at #NAACL2025! We show that token alignability is a stronger predictor of cross-lingual transfer than literal token overlap. Read it here: arxiv.org/abs/2502.06468
arxiv.org
Beyond Literal Token Overlap: Token Alignability for Multilinguality
Previous work has considered token overlap, or even similarity of token distributions, as predictors for multilinguality and cross-lingual knowledge transfer in language models. However, these very li...
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Jindřich Libovický @jlibovicky.bsky.social · 07/02/2025
Short notes about what pre-prints I noticed in December and January are now on my blog: jlibovicky.github.io/2025/02/07/M...
jlibovicky.github.io
Highlights from Machine Translation and Multilinguality in December 2024 and January 2025
MuLan: Adapting Multilingual Diffusion Models for Hundreds of Languages with Negligible Cost
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Jindřich Libovický @jlibovicky.bsky.social · 14/01/2025
Join Mu-SHROOM 🍄, a SemEval 2025 shared task on detecting hallucination spans in multilingual LLM outputs! 🌍 Includes Czech with regional Czech questions 🇨🇿. Do you think you can spot when something isn’t true? 🤔 Try it out! 👉 helsinki-nlp.github.io/shroom #SemEval2025 #NLP
helsinki-nlp.github.io
Welcome to SemEval-2025 Task-3 — Mu-SHROOM, the Multilingual Shared-task on Hallucinations and Related Observable Overgeneration Mistakes
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Jindřich Libovický @jlibovicky.bsky.social · 24/12/2024
Happy holidays! 🎄🎅🤩🎁
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Jindřich Libovický @jlibovicky.bsky.social · 06/12/2024
Highlights from multilingual #NLP and machine translation papers I found on arXiv in November are now on my blog: jlibovicky.github.io/2024/12/05/M...
jlibovicky.github.io
Highlights from Machine Translation and Multilinguality in November 2024
Mitigating Metric Bias in Minimum Bayes Risk Decoding
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Jindřich Libovický @jlibovicky.bsky.social · 03/12/2024
This is going to be fun! 🤓 We have three years to spend 6.5M CZK on improving multilingual tokenization. The goal is to make subwords more alignable across languages and help languages that suffer from over-segmentation with current models.
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Jindřich Libovický @jlibovicky.bsky.social · 21/11/2024
Just shared my takeaways from #EMNLP2024 on my blog: jlibovicky.github.io//2024/11/21/...
jlibovicky.github.io
Notes from EMNLP 2024
Last week, I was at EMNLP in Miami, and here are a few notes about what I saw at the conference.
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Reposted by Jindřich Libovický
Institute of Formal and Applied Linguistics @ufal.mff.cuni.cz · 19/11/2024
Hello Blue Sky! 👋 This is the official account of the Institute of Formal and Applied Linguistics (ÚFAL for short) at the Faculty of Mathematics and Physics, Charles University in Prague 🇨🇿. Here, we will share news from the life of the institute and our members.
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Jindřich Libovický @jlibovicky.bsky.social · 19/11/2024
Hello, Blue Sky 👋 🦋 Looking forward to reading and sometimes also posting about #NLP and related stuff! 🤓
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