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Replace logits_to_logprobs implementation with numpy equivalent to llama.cpp #991

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Merged
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Dec 12, 2023
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Replace logits_to_logprobs implementation with numpy equivalent to llama.cpp #991

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12 changes: 8 additions & 4 deletions llama_cpp/llama.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2280,10 +2280,14 @@ def token_nl(self) -> int:
return self._model.token_nl()

@staticmethod
def logits_to_logprobs(logits: List[float]) -> List[float]:
exps = [math.exp(float(x)) for x in logits]
sum_exps = sum(exps)
return [math.log(x / sum_exps) for x in exps]
def logits_to_logprobs(logits: npt.NDArray[np.single]) -> npt.NDArray[np.single]:
maximum = np.max(logits)
tmp = np.subtract(logits, maximum, dtype=np.single)
np.exp(tmp, out=tmp)
normalizer = 1.0 / np.sum(tmp)
np.multiply(normalizer, tmp, out=tmp)
np.log(tmp, out=tmp)
return tmp

@staticmethod
def longest_token_prefix(a: Sequence[int], b: Sequence[int]):
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