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import cPickle
class Vocabulary:
OOV_VAL = -1
def __init__(self):
self.str_to_tok = {}
self.tok_to_str = {}
def put(self, string):
if string in self.str_to_tok:
raise ValueError("%s is already in this vocabulary (token %d)" % \
(string, self.str_to_tok[string]))
return self.ensure(string)
def ensure(self, string):
if string in self.str_to_tok:
return
tok = len(self)
self.str_to_tok[string] = tok
self.tok_to_str[tok] = string
return tok
def gett(self, string):
if string not in self.str_to_tok:
return self.OOV_VAL
return self.str_to_tok[string]
def gets(self, tok):
return self.tok_to_str[tok]
def strs(self):
return self.str_to_tok.keys()
def toks(self):
return self.tok_to_str.keys()
def __len__(self):
return len(self.str_to_tok)
def save(self, path):
with open(path, 'w') as f:
cPickle.dump(self, f)
@classmethod
def load(cls, path):
with open(path) as f:
return cPickle.load(f)
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