Source code for nltk.lm.util

# -*- coding: utf-8 -*-
# Natural Language Toolkit
#
# Copyright (C) 2001-2019 NLTK Project
# Author: Ilia Kurenkov <ilia.kurenkov@gmail.com>
# URL: <http://nltk.org/>
# For license information, see LICENSE.TXT
"""Language Model Utilities"""

from math import log

NEG_INF = float("-inf")
POS_INF = float("inf")


[docs]def log_base2(score): """Convenience function for computing logarithms with base 2.""" if score == 0.0: return NEG_INF return log(score, 2)