parameters: (self, wid)
return_statement: return self.id2word[wid]
docstring: Return mapping of index to word.
          @param wid (int): word index
          @returns word (str): word corresponding to index
docstring_summary: Return mapping of index to word.
docstring_tokens: Return mapping of index to word .
function: def id2word(self, wid):
          """ Return mapping of index to word.
          @param wid (int): word index
          @returns word (str): word corresponding to index
          """
          return self.id2word[wid]
function_tokens: def id2word ( self , wid ) : return self . id2word [ wid ]