NMS for multi-class bboxes. Args: multi_bboxes (Tensor): shape (n, #class*4) or (n, 4) multi_scores (Tensor): shape (n, #class), where the last column contains scores of the background class, but this will be ignored. score_thr (float): bbox threshold, bboxes
(multi_bboxes,
multi_scores,
score_thr,
nms_cfg,
max_num=-1,
score_factors=None,
return_inds=False)
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