8. データ構造 8 • id: ad identifier • click: 0/1 for non-click/click • hour: YYMMDDHH • C1 -- anonymized categorical variable • banner_pos • site_id • site_domain • site_category • app_id • app_domain • app_category • device_id • device_ip • device_model • device_type • device_conn_type • C14-C21 -- anonymized categorical variables