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pufferlib
Version-aware guidance for PufferLib reinforcement-learning environments, vectorization, policies, PuffeRL training, evaluation, and safe checkpoint review. Covers the native 5.0 build and environment API, published 3.0.0 Gymnasium/PettingZoo adaptation, and a pinned historical 4.0 profile.
skills/pufferlib/SKILL.md
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# PufferLib
Choose the version before choosing an API. Reviewed **2026-10-01**:
| Profile | Status | Main use |
|---|---|---|
| Native source `5.0` | Current default branch and live documentation | C/CUDA environments, native trainer; CPU evaluation only |
| `pufferlib==3.0.0` | Latest PyPI release, published 2025-06-23; sdist only | Python/Gymnasium/PettingZoo adaptation and Torch PuffeRL |
| Pinned source `4.0` | Historical snapshot | C Ocean interface with an optional Torch fallback |
For **5.0**, read [references/native-5.md](references/native-5.md). The reviewed
revision is `6ffa5b10dbbbe4d1e8288367c7d9d3acd3bad4a2`. Its CLI is
`./puffer train` after building an environment, not `puffer train ENV_NAME`.
There is no 5.0 Python emulation/vector API or `--slowly` fallback.