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- # -*- 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")
- def log_base2(score):
- """Convenience function for computing logarithms with base 2."""
- if score == 0.0:
- return NEG_INF
- return log(score, 2)
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