utils/box_ops3d.py [403:431]:
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    if rotated_boxes:
        inter_areas = torch.zeros((B, K1, K2), dtype=torch.float32)
        rect1 = rect1.cpu()
        rect2 = rect2.cpu()
        nums_k2_np = to_list_1d(nums_k2)
        non_rot_inter_areas_np = to_list_3d(non_rot_inter_areas)
        for b in range(B):
            for k1 in range(K1):
                for k2 in range(K2):
                    if nums_k2 is not None and k2 >= nums_k2_np[b]:
                        break
                    if non_rot_inter_areas_np[b][k1][k2] == 0:
                        continue
                    ##### compute volume of intersection
                    # inter = polygon_clip(rect1[b, k1], rect2[b, k2])
                    inter = polygon_clip_unnest(rect1[b, k1], rect2[b, k2])
                    # if inter is None:
                    # if len(inter) == 0:
                    #     # area = torch.zeros(1, dtype=torch.float32, device=inter_areas.device).squeeze()
                    #     # area = 0
                    #     continue
                    # else:
                    
                    if len(inter) > 0:
                        # inter = torch.stack(inter)
                        # xs = inter[:, 0]
                        # ys = inter[:, 1]
                        xs = torch.stack([x[0] for x in inter])
                        ys = torch.stack([x[1] for x in inter])
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utils/box_util.py [576:593]:
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    if rotated_boxes:
        inter_areas = torch.zeros((B, K1, K2), dtype=torch.float32)
        rect1 = rect1.cpu()
        rect2 = rect2.cpu()
        nums_k2_np = to_list_1d(nums_k2)
        non_rot_inter_areas_np = to_list_3d(non_rot_inter_areas)
        for b in range(B):
            for k1 in range(K1):
                for k2 in range(K2):
                    if nums_k2 is not None and k2 >= nums_k2_np[b]:
                        break
                    if non_rot_inter_areas_np[b][k1][k2] == 0:
                        continue
                    ##### compute volume of intersection
                    inter = polygon_clip_unnest(rect1[b, k1], rect2[b, k2])
                    if len(inter) > 0:
                        xs = torch.stack([x[0] for x in inter])
                        ys = torch.stack([x[1] for x in inter])
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