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Pablo Samuel Castro @pcastr.bsky.social · 18/08/2026

Third #runconference at #RLC2026 going strong! We'll do one last tomorrow, same place, same time, for those who are still around.

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Pablo Samuel Castro @pcastr.bsky.social · 17/08/2026

Another great #runconference at #RLC2026 ! Same place, same time tomorrow!

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Pablo Samuel Castro @pcastr.bsky.social · 16/08/2026

If you're closer to the venue, Josiah will be starting at 7 right in front of the conference venue #rlconference #RLC2026 maps.app.goo.gl/UoqpDjGgQDch...

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Pablo Samuel Castro @pcastr.bsky.social · 16/08/2026

Great turnout for our first #runconference at #RLC2026 ! Same place, same time tomorrow!

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Pablo Samuel Castro @pcastr.bsky.social · 16/08/2026

Great talk by Marc G. Bellemare at #RLC2026 , ranging from deep RL representations, to stable LLM post-training, to robust statistical measures of performance!

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Pablo Samuel Castro @pcastr.bsky.social · 15/08/2026

At #RLC2026 and want to run? Come for a #runconference tomorrow (Sunday)! Let's meet at 7am at the pin below and run up the mountain for a beautiful morning view. See you there! maps.app.goo.gl/w7e7CqRbARdG...

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Pablo Samuel Castro @pcastr.bsky.social · 15/08/2026

If you're at #RLC2026, come by, starting in 15ish minutes! I'm currently making my way from the airport but should arrive just in the nick of time 😅 Looking forward to moderating this debate!

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Pablo Samuel Castro @pcastr.bsky.social · 11/07/2026

Fifth and last #runconference at #ICML2026 was great! Thanks to everyone who came out, and until next time!

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Pablo Samuel Castro @pcastr.bsky.social · 10/07/2026

in workshops, when panels start, i leave.

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Pablo Samuel Castro @pcastr.bsky.social · 10/07/2026

Fourth #runconference at #ICML2026 was a bit of a bust, as separate running club cancelled last minute 🫤 Still had a nice (and very humid) solo run. Tomorrow will be the last one, we'll meet at 8am at Hannam station for a run around the river, join us! naver.me/F5swAa7n

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Pablo Samuel Castro @pcastr.bsky.social · 09/07/2026

Interested in the differences in strategic behavior between humans and LLMs? Come chat with me and @caroline-wang.bsky.social this Thursday afternoon, 5pm, #ICML2026 poster session in Hall A (Poster #401)!

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Pablo Samuel Castro @pcastr.bsky.social · 09/07/2026

No rain for third #runconference at #ICML2026 but it was quite humid! Tomorrow we'll join a separate running club at 8am, running around some of the main sights in Seoul, join us! Apparently anyone can join, just register here: luma.com/o0wqzdyc

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Pablo Samuel Castro @pcastr.bsky.social · 08/07/2026

Second #runconference at #ICML2026 was *very* wet, but we did it! Join us tomorrow, same place and same time!

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Pablo Samuel Castro @pcastr.bsky.social · 08/07/2026

Today I'll be presenting this spotlight poster with Ali at 2:30-4:15, in Hall A, poster #303. Come chat with us about good representations for RL! #ICML2026

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Pablo Samuel Castro @pcastr.bsky.social · 08/07/2026

At the Google booth until 11. Stop by! #icml2026

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Pablo Samuel Castro @pcastr.bsky.social · 07/07/2026

Today at the #ICML2026 LatinX in AI workshop Ali did a great job presenting our paper! We'll be presenting the poster at the main conference, tomorrow Wednesday July 8th, 2:30-4:15, Hall A, poster #303. Come chat with Ali and me then!

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Pablo Samuel Castro @pcastr.bsky.social · 07/07/2026

First #runconference at #ICML2026 was rainy but good! We ran up to the city wall and got nice views of the city. Join us tomorrow, same place, same time!

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Pablo Samuel Castro @pcastr.bsky.social · 06/07/2026

At Seoul for #ICML2026 and want to start your days with a run? Meet me tomorrow Tuesday at 7am in front of COCODA [NAVER Maps] COCODA 398-6 Jongno 5(o)-ga Jongno-gu Seoul naver.me/xuFb2ppi #runconference

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Pablo Samuel Castro @pcastr.bsky.social · 01/07/2026

I'm excited to share our latest work “Representation Learning Enables Scalable Multitask Deep Reinforcement Learning”. In this work, we revisit a fundamental question in reinforcement learning: What if representation learning was the key ingredient behind scalable RL? 1/🧵

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Pablo Samuel Castro @pcastr.bsky.social · 04/06/2026

really proud of this work done with fantastic collaborators, in particular daniel, @kevinjmiller.bsky.social & @neurokim.bsky.social ! i learned so much about neuroscience, & it was great to work on using AI techniques to advance science. read kevin's thread below or, even better, read the paper!

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Pablo Samuel Castro @pcastr.bsky.social · 29/04/2026

I wish there were a way to increase diversity in workshop keynotes/panelists. There are a few famous researchers who end up being keynotes/panelists on multiple workshops, which means lots of other great researchers are not getting those opportunities.

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Pablo Samuel Castro @pcastr.bsky.social · 27/04/2026

Fun last #runconference at #ICLR2026, included sidewalk and beach running, a little soccer ball kicking, and going in the Ocean! also passed some lifeguards in training during my last sprint

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Pablo Samuel Castro @pcastr.bsky.social · 26/04/2026

Another great #runconference this morning at #ICLR2026 ! Tomorrow is my last day so trying something different: BEACH RUN Let's meet at the pin below at 7:30am, run for a bit, then go in the water for a swim! maps.app.goo.gl/KZfuFtgsdmn4...

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Pablo Samuel Castro @pcastr.bsky.social · 26/04/2026

I will be giving a talk about this work at the "From Human Cognition to AI Reasoning: Models, Methods, and Applications" #ICLR2026 workshop 🗓️Sunday, April 26, 2026 10:30 AM BRT 📍 Room 202 C As well as a poster at 3:30pm in the same room. Come by!

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Pablo Samuel Castro @pcastr.bsky.social · 25/04/2026

Still at #ICLR2026 and still into RL? Come talk to @johanobandoc.bsky.social @waltermayor.bsky.social and me at our poster today (Saturday)! 🗓️April 25, 3:15 PM -5:45 PM BRT 📍Pavilion 4· #️⃣ Poster #4515

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Pablo Samuel Castro @pcastr.bsky.social · 25/04/2026

Today (Saturday) I'll be at the Google both at #ICLR2026 , 1:30-2pm, if you'd like to come chat.

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Pablo Samuel Castro @pcastr.bsky.social · 24/04/2026

Great first #runconference at #ICLR2026 ! Join us tomorrow at the same place, although we'll start at 6:30am to avoid the heat 🥵

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Pablo Samuel Castro @pcastr.bsky.social · 23/04/2026

Are you at #ICLR2026 and staying at (or near) the Marriott? Come run with me tomorrow (Friday) at 7am! Starting from the Marriott. #runconference maps.app.goo.gl/zBzQjRLDMWHi...

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Reposted by Pablo Samuel Castro

Reinforcement Learning Conference @rl-conference.bsky.social · 31/03/2026

We have the keynote speakers for RLC2026 now! Thrilled to welcome Rika Antonova, Sheila McIlraith, Marc G. Bellemare, Danijar Hafner, Balaraman Ravindran! Details: rl-conference.cc/index.html The RL community is coming together this August in Montréal, Québec, Canada. Hope you make it!

rl-conference.cc

RLC 2026

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Pablo Samuel Castro @pcastr.bsky.social · 20/03/2026

Applications for the global Google PhD Fellowship Program are open! Fellowships directly support grad students doing exceptional and innovative research in computer science and related fields as they pursue their PhD. Learn more and apply by April 30 at goo.gle/phdfellowship.

goo.gle

Google PhD fellowship program

The Google PhD Fellowship Program recognizes outstanding graduate students doing exceptional work in computer science, related disciplines, or promising research areas.

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Reposted by Pablo Samuel Castro

James MacGlashan @jmac-ai.bsky.social · 17/03/2026

Exploring SigReg regularization for RL has been on my "todo when I have time" list for a while. While I haven't fully read this paper yet, it appears to do a fantastic thorough investigation, and it looks quite promising!

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Pablo Samuel Castro @pcastr.bsky.social · 17/03/2026

New paper 🚨 "Stable Deep Reinforcement Learning via Isotropic Gaussian Representations" Deep RL suffers from unstable training, representation collapse, and neuron dormancy. We show that a simple geometric insight, isotropic Gaussian representations, can fix this. Here's how 👇

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Reposted by Pablo Samuel Castro

Reinforcement Learning Conference @rl-conference.bsky.social · 03/03/2026

In light of the ongoing conflict in the Middle East, RLC decided to remove the abstract deadline: rl-conference.cc/callforpaper... The only deadline is for the full paper: Mar 5(AOE) openreview.net/group?id=rl-... Affected folks may also contact the PCs to discuss deadline extensions before Mar 5.

openreview.net

RLC 2026 Conference

Welcome to the OpenReview homepage for RLC 2026 Conference

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Reposted by Pablo Samuel Castro

Aadirupa Saha @aadirupa.bsky.social · 26/02/2026

RLC 2026 Call for Workshop is live on OpenReview! Submission deadline: Mar 12 (AoE). Full details here: rl-conference.cc/call_for_wor... @glenberseth.bsky.social @eugenevinitsky.bsky.social @twkillian.bsky.social @schaul.bsky.social @sologen.bsky.social @audurand.bsky.social @bradknox.bsky.social

rl-conference.cc

RLJ | RLC Call for Workshops

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Pablo Samuel Castro @pcastr.bsky.social · 17/02/2026

It's been such a pleasure working with @caroline-wang.bsky.social the last few months. She is a fantastic researcher, engineer, & person, and I really hope we can work together again. Check out the paper that came out of her time with us, comparing strategic behavior of humans and LLMs!👇🏽

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Pablo Samuel Castro @pcastr.bsky.social · 21/01/2026

Today's wordle spoke volumes. Wordle 1,677 2/6 ⬛🟩⬛🟩🟩 🟩🟩🟩🟩🟩 P.S. here's a selfie of my x-country ski commute this morning 😃🎿

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Pablo Samuel Castro @pcastr.bsky.social · 07/01/2026

Today's wordle energized me Wordle 1,662 2/6 🟨🟩🟩⬛⬛ 🟩🟩🟩🟩🟩

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Pablo Samuel Castro @pcastr.bsky.social · 02/01/2026

How I started 2026, hoping to keep this spirit up throughout the year! Happy new year!

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Pablo Samuel Castro @pcastr.bsky.social · 30/12/2025

Another one of my favorite spots in Ecuador: El Pailón del Diablo 🇪🇨

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Pablo Samuel Castro @pcastr.bsky.social · 29/12/2025

Gets better the closer you get 🏔️🇪🇨

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Pablo Samuel Castro @pcastr.bsky.social · 26/12/2025

Will never tire of this view ❤️🇪🇨

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Pablo Samuel Castro @pcastr.bsky.social · 22/12/2025

Today's wordle made me feel warm. Wordle 1,646 2/6 ⬛🟨🟩⬛⬛ 🟩🟩🟩🟩🟩

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Pablo Samuel Castro @pcastr.bsky.social · 20/12/2025

Despite some of its flaws, OpenReview has had a tremendously positive impact on our research community. This is a great initiative! Join me, and many others, in donating to ensure OpenReview not only remains a positive force, but is able to improve.

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Pablo Samuel Castro @pcastr.bsky.social · 10/12/2025

This #NeurIPS2025 was tiring, but it was fantastic to connect with so many friends and colleagues! I was so busy I didn't get a chance to tweemote our papers at the conference, so I'll remedy that with this post-hoc thread: 👇🏾

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Pablo Samuel Castro @pcastr.bsky.social · 07/12/2025

Sixth, and last, #runconference at #NeurIPS2025 had the best turnout yet! Thanks to everyone who came out, until the next conference! The second picture is of those who stayed until the end 😅🏅 🤖🏃🏾👋🏾

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Pablo Samuel Castro @pcastr.bsky.social · 07/12/2025

Fifth #runconference at #NeurIPS2025 , good turnout again! Tomorrow is the last run (at least with me), so if you've had FOMO this week, you have one more chance! 🤖🏃🏾

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Pablo Samuel Castro @pcastr.bsky.social · 06/12/2025

Fourth #runconference at #NeurIPS2025 had the best turnout yet! Help us beat it tomorrow, same place, same time (follow tweet thread for details)! 🤖🏃🏾

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Pablo Samuel Castro @pcastr.bsky.social · 04/12/2025

Third #runconference at #NeurIPS2025 was great, including special guest @JeffDean ! Same place, same time, tomorrow morning if you want to join! 🤖🏃🏾 (I forgot to post yesterday's pic, so including it here)

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Pablo Samuel Castro @pcastr.bsky.social · 03/12/2025

. @roger-creus.bsky.social and @johanobandoc.bsky.social did an awesome job presenting our paper at the LatinX in AI workshop at #NeurIPS . If you missed it, come to our poster #310 on Friday 11am, exhibit hall C,D,E.

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