2nd Place Solution for Waymo Open Dataset Challenge - Real-time 2D Object Detection. - Yueming Zhang; Xiaolin Song; Bing Bai; Tengfei Xing; Chao Liu; Xin Gao; Zhihui Wang; Yawei Wen; Haojin Liao; Guoshan Zhang; Pengfei Xu 013 (CoRR, 2021)