# Natural Language Toolkit # # Copyright (C) 2001-2024 NLTK Project # Author: Ilia Kurenkov <ilia.kurenkov@gmail.com> # URL: <https://www.nltk.org/> # For license information, see LICENSE.TXT """Language Model Utilities""" from math import log NEG_INF = float("-inf") POS_INF = float("inf") def log_base2(score): """Convenience function for computing logarithms with base 2.""" if score == 0.0: return NEG_INF return log(score, 2)