In TRECVID 2020 evaluation we participate in two tasks: instance search (INS) and activities in extended video (ActEV). In this paper, we describe the BUPT - MCPRL systems and evaluation results for TRECVID 2020[1] in INS and ActEV tasks. Activities in Extended Video (ActEV): Our proposed system framework for ActEV 2020 consists of three stages: spatial activity location, activity tracking, temporal activity detection and classification. p_baseline_4 : the baseline of our method. In this submission, we use 3D - RetinaNet and 3D - Cascade - RCNN with Focal Loss to generate activity tubes, then we use tracking algorithm to link the tubes and build efficient temporal localization systems to detect activities (activity instances). p_baseline_12: replace TPN with r(2+1)d and adjust the threshold.
