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Hugging Face Hub adds RL Environments filter and framework tags

Welcome RL Environments to the hub

What happened

Hugging Face Hub has added an RL Environments filter that groups dataset repositories carrying the `rl-environment` tag, without requiring a new repository type, registry, or registration process.

Why it matters

Hugging Face is treating RL environments as tagged dataset repositories, offering a signal of how the cost of reusing environments across frameworks may change.

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