Jiale Li Hang Dai Ling Shao 0001 Yong Ding 0003 Anchor-free 3D Single Stage Detector with Mask-Guided Attention for Point Cloud. 553-562 2021 ACM Multimedia https://doi.org/10.1145/3474085.3475208 conf/mm/2021 db/conf/mm/mm2021.html#LiD0021