It's a mixed start to the week for the A.I. trade when it comes to analyst views. Micron (MU) got an upgrade from Barclays but the firm also downgraded Marvell (MRVL). Texas Instruments (TXN) also got a downgrade from Mizuho. In the restaurant space, Goldman Sachs served an upgrade for Darden Restaurants (DRI). Diane King Hall turns to the biggest upgrades and downgrades to watch on Monday's trading session.