You can take the #1 train to 116th Street (Columbia University) station and follow this map to get to the 4th floor of the Mudd building. (Note that when you enter the Mudd building from the campus level, it is already the 4th floor.) Then follow signs of WINE 2019 to the Computer Science Department and CSB 451. You may park on the street or use one of the local parking garages.