Pepijn 95033733fc deps: add sentencepiece to the pi extra (FAST action tokenizer) ...

PI052 and PI0_FAST both load ``physical-intelligence/fast`` as
their action tokenizer. That tokenizer's HF backend requires
``sentencepiece`` to instantiate (or ``tiktoken``); without it
``AutoProcessor.from_pretrained`` raises:

  ValueError: Couldn't instantiate the backend tokenizer from one of:
  (1) a tokenizers library serialization file,
  (2) a slow tokenizer instance to convert or
  (3) an equivalent slow tokenizer class to instantiate and convert.
  You need to have sentencepiece or tiktoken installed [...]

It wasn't listed in pyproject so fresh installs missed it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-13 17:52:55 +02:00

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