(self, tuple_id, attr_name)
return vid
get_cell_id returns cell ID: a unique ID for every cell.

        Cell ID: _tid_ * (# of attributes) + attr_idx
get_cell_id returns cell ID: a unique ID for every cell.
get_cell_id returns cell ID : a unique ID for every cell .
def get_cell_id(self, tuple_id, attr_name):
        """
        get_cell_id returns cell ID: a unique ID for every cell.

        Cell ID: _tid_ * (# of attributes) + attr_idx
        """
        vid = tuple_id*self.attr_count + self.attr_to_idx[attr_name]
        return vid
def get_cell_id ( self , tuple_id , attr_name ) : vid = tuple_id * self . attr_count + self . attr_to_idx [ attr_name ] return vid