Click-Through Rate prediction: TOP-5 solution for the Avazu contest Dmitry Efimov April 21, 2015 Outline Provided data Likelihood features FTRL-Proximal Batch algorithm Factorization Machines Final results Competition Provided data Device layer: id, model, type Basicfeatures Connection layer: ip, type Time layer: day, hour Banner layer: position, C1, C14-C21 Site layer: id, domain, category Applic