Hypothesis.score not understood

[FWERME]

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
    """

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

Disclaimer
This discussion asks a similar questionhttps://github.com//discussions/249
However it is not answered - so I post mine despite the similar previously posed question.