You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

21 lines
474 B
Python

# -*- 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)