Hypothesis.score value

The score value in argos-translate/argostranslate/translate.py at master · argosopentech/argos-translate · GitHub

class Hypothesis:

“”"Represents a translation hypothesis

Attributes:

value: The hypothetical translation value

score: The score representing the quality of the translation

“”"

I understand, that the score range is -infty to 0.
This suggests, that IT might be the logarithm (natural or base 10 or other?) of a value between 0 and 1.

Question :
How is the score defined / how does it translate to a confidence in [0, 1]?

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