The highest coverage ratio for each attribute is usually obtained when masking that attribute in the distractor MR (entries on the main diagonal, underlined), in particular for FAMILYFRIENDLY (FF), FOOD, PRICERANGE (PR), and AREA.
the base speaker S 0 model is often underinformative, e.g., for the E2E task failing to mention certain attributes of a MR, even though almost all the training examples incorporate all of them.