Research Scientist @ Apple MLR | Previously @ETH Zurich @EPFL @MIT, Research Intern @Amazon

Joined April 2021
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Pinned Tweet
✨New Preprint ✨ Ever thought that reconstructing masked pixels for image representation learning seems sub-optimal? In our new preprint, we show how masking principal components—rather than raw pixel patches— improves Masked Image Modelling (MIM). Find out more below 🧵
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🚀 The MLX team is growing! If you love writing blazing-fast GPU kernels or implementing foundational models in Python & Swift, we want you. Drop a DM or apply below! 👇 #MachineLearning #AppleSilicon jobs.apple.com/en-us/details… github.com/ml-explore
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In a multimodal context, even the discrete/continuous divide is a distraction. The real challenge is bridging the semantic gap between inherently high-level language tokens, and the very low-level representations we tend to use for perceptual signals. (I couldn't resist😆)
I really think that autoregression and diffusion is a false dichotomy -- they can easily co-exist (e.g., diffusion forcing). The real one is between discrete and continuous tokens.
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🎨Activation steering can reliably push a text-to-image generator toward a visual concept, but at a cost: each concept needs its own estimation. ⚡HyperTransport (HT) predicts the intervention directly, matching per-concept SOTA at 3–4 orders of magnitude less cost. [1/6]
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Apr 6
Introducing the OpenAI Safety Fellowship, a new program supporting independent research on AI safety and alignment—and the next generation of talent. openai.com/index/introducing…
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𝗣𝗮𝗿𝗮𝗥𝗡𝗡: 𝗨𝗻𝗹𝗼𝗰𝗸𝗶𝗻𝗴 𝗣𝗮𝗿𝗮𝗹𝗹𝗲𝗹 𝗧𝗿𝗮𝗶𝗻𝗶𝗻𝗴 𝗼𝗳 𝗡𝗼𝗻𝗹𝗶𝗻𝗲𝗮𝗿 𝗥𝗡𝗡𝘀 𝗳𝗼𝗿 𝗟𝗟𝗠𝘀 For years, we’ve given RNNs for doomed, and looked at Transformer as 𝘁𝗵𝗲 LLM—but we just needed better math 📄arxiv.org/abs/2510.21450 💻github.com/apple/ml-pararnn
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21 Oct 2025
🚀 Excited to share LinEAS, our new activation steering method accepted at NeurIPS 2025! It approximates optimal transport maps e2e to precisely guide 🧭 activations achieving finer control 🎚️ with ✨ less than 32 ✨ prompts! 💻github.com/apple/ml-lineas 📄arxiv.org/abs/2503.10679
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We’re excited to share our new paper: Continuously-Augmented Discrete Diffusion (CADD) — a simple yet effective way to bridge discrete and continuous diffusion models on discrete data, such as language modeling. [1/n] Paper: arxiv.org/abs/2510.01329
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🚨 Machine Learning Research Internship opportunity in Apple MLR! We are looking for a PhD research intern with a strong interest in world modeling, planning or learning video representations for planning and/or reasoning. If interested, apply by sending an email to me at vthilak@apple.com. Applications will be reviewed until the position is filled.
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Super excited to share l3m 🚀, a library for training large multimodal models, which we used to build AIM and AIMv2. Massive thanks to @alaa_nouby @DonkeyShot21 Michal Klein @MustafaShukor1 @jmsusskind and many others.
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Had a great time speaking at @NECLabsEU about using activation steering for better instruction-following in LLMs! Check out the talk 🗣️: youtu.be/3ozuaGaEjpo?si=T9ZL… and paper 📜: arxiv.org/abs/2410.12877 This work that I did at @MSFTResearch shows how interpretability-based approaches can improve LLM controllability, connecting model understanding with practical utility.
We hosted an insightful talk by @alesstolfo, PhD student at @ETH and doctoral fellow at the Swiss CYD Campus, on improving instruction-following in language models via activation steering. Watch here: youtu.be/3ozuaGaEjpo?si=p_Ci…. #NECLabs #LLM
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We hosted an insightful talk by @alesstolfo, PhD student at @ETH and doctoral fellow at the Swiss CYD Campus, on improving instruction-following in language models via activation steering. Watch here: youtu.be/3ozuaGaEjpo?si=p_Ci…. #NECLabs #LLM
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30 Jul 2025
Join us tomorrow morning #ACL2025NLP #ACL2025
If you're at ACL, join us for the tutorial "LLMs for Education: Understanding the Needs of Stakeholders, Current Capabilities and the Path Forward" at the BEA workshop (Room 1.85–86) 9:00-12:30am tomorrow (July 31st) @aclmeeting
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I am heading to @icmlconf to present our position paper with @randall_balestr @klindt_david @wielandbr on what we believe are the important next steps to advance SSL. It's not either theory or practice, it's both. We as a community need a better discussion.
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Is the mystery behind the performance of Mamba🐍  keeping you awake at night? We got you covered! Our ICML2025 paper demystifies input selectivity in Mamba from the lens of approximation power, long-term memory, and associative recall capacity. arxiv.org/abs/2506.11891
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Current KL estimation practices in RLHF can generate high variance and even negative values! We propose a provably better estimator that only takes a few lines of code to implement.🧵👇 w/ @xtimv and Ryan Cotterell code: arxiv.org/pdf/2504.10637 paper: github.com/rycolab/kl-rb
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Presenting our work at #ICLR this week! Come by the poster or oral session to chat about copyright protection and AI/LLM safety 📌 𝐏𝐨𝐬𝐭𝐞𝐫: Friday, 10 a.m. – 12.30 p.m. | Booth 537 📌 𝐎𝐫𝐚𝐥: Friday, 3.30 – 5 p.m. | Room Peridot @FraPintoML @DonhauserKonst @FannyYangETH
LLMs accidentally spitting out copyrighted content? We’ve got a fix. Our paper on CP-Fuse—a method to prevent LLMs from regurgitating protected data—got accepted as an Oral at #ICLR2025! 👇Check it out! 📄 arxiv.org/pdf/2412.06619 🤖 github.com/jaabmar/cp_fuse
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I am at #ICLR25 😎 and looking for collaborations on self-supervised learning/ understanding representation learning and logical reasoning. Let's chat. 💭 Otherwise, come by on Sat 3pm to our poster #308 on cross-entropy based SSL.
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I am at ICLR this week ! Excited to be presenting our work on identifiability with @rpatrik96 @JuhosAttila @randall_balestr @klindt_david @wielandbr. Tune in on Saturday at 11AM in Garnet 216-218 for our oral presentation and at 3PM in Hall 3/2B for our poster!
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