(self, doc_index)
return self.doc_dict[1][doc_index]
Convert doc_index --> doc_id
Convert doc_index --> doc_id
Convert doc_index -- > doc_id
def get_doc_id(self, doc_index):
        """Convert doc_index --> doc_id"""
        return self.doc_dict[1][doc_index]
def get_doc_id ( self , doc_index ) : return self . doc_dict [ 1 ] [ doc_index ]