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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _value_decode(cls, member, value):
 """ Internal method used to decode values from redis hash :param member: str :param value: bytes :return: multi """

        if value is None:
            return None
        try:
            field_validator = cls.fields[member]
        except KeyError:
            return cls.valueparse.decode(value)

        return field_validator.decode(value)