/AI1d ago

PufferAI founder Joseph Suarez releases Constellation, an open-source experiment visualizer built as a single-file C implementation

The tool includes over 20,000 reinforcement learning experiments.

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Joseph Suarez 🐡@jsuarez#1268inAI

This is Constellation, our lightweight aggregate experiment visualizer. Open source, hackable. Single-file C implementation. Ships with 20,000+ RL experiments worth of data from PufferLib 4.

kache@yacineMTB

"how many experiments have you run" yes

8:18 AM · Jun 7, 2026 · 20.4K Views
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Users praise Constellation's single-file C visualizer for 20k+ RL experiments as an impressive feat of simple efficient shipping.

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Hrushikesh V Pawar@HrushikeshP1905

@jsuarez How do you recommend someone starting with PufferLib 4 with a new env creation and then the training? Good with python but not used C in the last 10 years. Any good tutorial (blog and/or video) to take me through the journey?

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It's first 2 weeks of your first systems course level C. Check the website. Copy one of the tutorial envs as a template and implement something that is only a couple hundred lines. I had also done exclusively Python for almost 10 years when I started on Puffer's low level. Now I prefer C.

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This is Constellation, our lightweight aggregate experiment visualizer. Open source, hackable. Single-file C implementation. Ships with 20,000+ RL experiments worth of data from PufferLib 4.

kache@yacineMTB

"how many experiments have you run" yes

1dViews 20.4KLikes 220Bookmarks 88
RARE@gunahneyd

@jsuarez Are you guys watching that? Automatic delivery

16hViews 19
beko@azygod

@jsuarez twenty thousand rl experiments and a single-file c visualizer. meanwhile most ai labs need a slack channel to draft a meeting. shipping is a skill most teams forgot they had.

22hViews 10
Lumin@luminxbt

@jsuarez the fact that its a single file C implementation is wild

23hViews 9
Ygift Checker@Ugift_tg

@jsuarez Single-file C is a flex. 20k experiments is the part that makes me want to actually open it.

21hViews 4