Source Code for Module nltk.model.api

 1   
 2  # subclass of ConditionalProbDistI? 
 3   
 4 -class ModelI(object): 
 5      """ 
 6      A processing interface for assigning a probability to the next word. 
 7      """ 
 8   
 9 -    def __init__(self): 
10          '''Create a new language model.''' 
11          raise NotImplementedError() 
12   
13 -    def prob(self, word, context): 
14          '''Evaluate the probability of this word in this context.''' 
15          raise NotImplementedError() 
16   
17 -    def logprob(self, word, context): 
18          '''Evaluate the log probability of this word in this context.''' 
19          raise NotImplementedError() 
20   
21 -    def choose_random_word(self, context): 
22          '''Randomly select a word that is likely to appear in this context.''' 
23          raise NotImplementedError() 
24   
25 -    def generate(self, n): 
26          '''Generate n words of text from the language model.''' 
27          raise NotImplementedError() 
28   
29 -    def entropy(self, text): 
30          '''Evaluate the total entropy of a message with respect to the model. 
31          This is the sum of the log probability of each word in the message.''' 
32          raise NotImplementedError() 
33