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pufferlib

Version-aware guidance for PufferLib reinforcement-learning environments, vectorization, policies, PuffeRL training, evaluation, and safe checkpoint review. Use when adapting Gymnasium/PettingZoo environments to published PufferLib 3.0.0 or working with the redesigned native 4.0 source line.

plugins/KalarisLabs/research-agent-skills/skills/pufferlib/SKILL.md

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# PufferLib

Use PufferLib with an explicit version profile. Upstream currently has two
incompatible surfaces:

| Profile | Status on 2026-07-23 | Main use |
|---|---|---|
| `pufferlib==3.0.0` | Latest stable PyPI release, published 2025-06-23 | Python/Gymnasium/PettingZoo emulation, `pufferlib.vector`, Torch PuffeRL |
| source `4.0` | Upstream default branch; not the latest stable PyPI artifact | Native C Ocean environments, native CUDA trainer, optional Torch fallback |

Do not combine 3.0 imports with 4.0 config/CLI examples. The 4.0 redesign
removed the 3.0 `emulation`, `vector`, and `pytorch` modules from the current
package tree.