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Pablo Samuel Castro

@pcastr

Señor swesearcher @ Google DeepMind. Adjunct prof @ U de Montreal & Mila. Musician. From 🇪🇨 living in 🇨🇦.
Ottawa/Montreal, QC psc-g.github.io Joined December 2009
842 Following 15K Followers 9K Posts

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Pablo Samuel Castro @pcastr
while working on agentick (to be presented at NeurIPS'26), @creus_roger found that ASCII inputs seemed to really help LLMs
during his internship at @VmaxAI he pushed on this idea and came up with GlyphBench, which serves as a benchmark, a research tool, & post-training suite!
Vmax Verified account @VmaxAI Oct 23
1/ 🎮 Can training on games improve LLM reasoning?

Introducing GlyphBench: 360+ game tasks for language-model RL.

We use it as a benchmark, a research tool, and a post-training suite.

🧵⬇️
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Pablo Samuel Castro @pcastr
Congrats @natolambert ! I agree the community needs this type of work and investment, and you're one of the best people I can think of to lead it.
Love the name and its explanation as well!
Nathan Lambert Verified account @natolambert Oct 2
Today we're unveiling Trillium Labs @trillium_labs, a new non-profit to foster the open science of frontier AI. We're building open post-training recipes and will expand into open infra to study RSI, reward-hacking, multi-agent systems, and whatever comes next.

We're built around the theory of change that you need more eyes to solve hard technical problems. We have faith in the scientific methods and communities that humanity has built, and worry that AI is becoming too closed to utilize them.

Trilliums are wildflowers that bloom briefly in the spring, before the forest canopies fill out. Though they are small, they lay the foundation for the cycles of growth and nourishment through the rest of the year. At Trillium Labs, the recipes will be the slow nutrients for the seasons and the model releases will be the blooms. Building an institution dedicated to this is needed because, much as nature’s trilliums are slow to expand and grow, the open-ecosystem needs time and dedicated resources to catch up.

I co-founded with with a long-time friend and collaborator Tom Zick (@thesezickbeats). We're hiring (full time + student collabs/interns), we're fundraising, and we're looking for compute. Please get in touch if you're interested in helping out. Offices based in the Bay Area and Cambridge MA, remote okay.

I’m in the Bay Area until for The Curve and COLM to connect with people who are interested. We’re thankful to have initial support from Halcyon Futures and Schmidt Sciences with more funding en route to enable our ambitions of scaling. Our advisors @Thom_Wolf, @HannaHajishirzi, @gneubig and @ctnzr have been instrumental to building the ecosystem that exists today, and I’m stoked to get to keep working with them.
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Pablo Samuel Castro @pcastr
In 2012 I thought I had left ML research forever, until @hugo_larochelle brought me into Google brain in Montreal.
I remain forever grateful for him believing in me and for guiding me during his time at Google. I feel honoured to call him a friend and colleague!
Sara Hooker Verified account @sarahookr Sep 14
Very happy to see this profile of @hugo_larochelle

Before I join Google Brain, I watched all his lectures from Sheffield. You have to remember at the time, all of the knowledge for deep learning belong to less then 100 people. He made it available to many more.

He became my PhD advisor many years later. Hugo is an exceptional researcher, has shaped so much of our ecosystem.
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Pablo Samuel Castro @pcastr
Seems like a great opportunity working with great people and resources!
Jakob Foerster Verified account @j_foerst Aug 21
TL;DR: This is one of the most important and exciting opportunities in AI on the planet - please read on.

The British Open-ended Learning & Discovery Lab is creating the perfect place for paradigm breaking AI research in the name of open-source and open-science. We have agency, we funding, we have unprecedented amounts of compute*, but WE NEED YOU!

..and we have created the dream job for you: The BOLD Fellow. This job combines a fast-moving, high agency, collaborative environment with full academic freedom and a salary that pays the bills.

Apply by noon UK time on the 15th of September for this once in a lifetime opportunity to shape the history of our field and of our planet:
my.corehr.com/pls/uoxrecruit…

*by academic standards
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