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# Natural Language Toolkit
#
# Copyright (C) 2001-2022 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)