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vllm.v1.watermarking.prfs.philox

Philox4x32-10 as defined by https://doi.org/10.1145/2063384.2063405.

Classes:

  • PhiloxPRF –

    Accelerator-friendly Philox4x32-10 watermark PRF.

PhiloxPRF

Bases: WatermarkPRF

Accelerator-friendly Philox4x32-10 watermark PRF.

Source code in vllm/v1/watermarking/prfs/philox.py 
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class PhiloxPRF(WatermarkPRF):
    """Accelerator-friendly Philox4x32-10 watermark PRF."""

    version = "philox4x32-10-v1"

    def __init__(self, key: int) -> None:
        if not 0 <= key <= 2**64 - 1:
            raise ValueError("Philox keys must fit in 64 bits")
        self.key = key

    def uniform(self, contexts: torch.Tensor, token_ids: torch.Tensor) -> torch.Tensor:
        key_words = self.key & _UINT32_MASK, self.key >> 32
        if contexts.device.type == "cuda":
            return _compiled_philox_uniform(*key_words, contexts, token_ids)
        return _philox_uniform(*key_words, contexts, token_ids)