(self, doc_id)
return self.doc_dict[0][doc_id]
Convert doc_id --> doc_index
Convert doc_id --> doc_index
Convert doc_id -- > doc_index
def get_doc_index(self, doc_id):
        """Convert doc_id --> doc_index"""
        return self.doc_dict[0][doc_id]
def get_doc_index ( self , doc_id ) : return self . doc_dict [ 0 ] [ doc_id ]