ó
ù`]c           @   s;   d  Z  d d l m Z e d ƒ Z e d ƒ Z d „  Z d S(   s   Language Model Utilitiesiÿÿÿÿ(   t   logs   -inft   infc         C   s   |  d k r t  St |  d ƒ S(   s:   Convenience function for computing logarithms with base 2.g        i   (   t   NEG_INFR    (   t   score(    (    s+   lib/python2.7/site-packages/nltk/lm/util.pyt	   log_base2   s    N(   t   __doc__t   mathR    t   floatR   t   POS_INFR   (    (    (    s+   lib/python2.7/site-packages/nltk/lm/util.pyt   <module>   s   