error in box correlation process.

[Mollylulu]

Hi there, thanks for sharing the code.

I've been trying to run the evaluation using the provided checkpoint, but encountered an error in the box correlation process. Here is the error message:

MV2D/mmdet3d_plugin/models/roi_heads/utils/box_correlation.py", line 353, in epipolar_in_box
    t_rois_xymax = t_points_xymax.max(1)[0]
RuntimeError: cannot perform reduction function max on tensor with no elements because the operation does not have an identity

I was wondering if you've come across this error during your testing, and if so, do you have any suggestions on how to resolve it?
Thanks in advance.

[wangzt-halo]

It seems like the first dimension of t_points_xymax is 0. I think you can add a dimension check before box_correlation if you encounter this issue.

[Mollylulu]

Indeed, t_points_xymax is empty. I encountered this issue while using the provided checkpoint and code for evaluation. Have you come across this problem too, and if so, do you happen to know a solution?

[wangzt-halo]

Indeed, t_points_xymax is empty. I encountered this issue while using the provided checkpoint and code for evaluation. Have you come across this problem too, and if so, do you happen to know a solution?

I haven't met this issue so far, but I think you can try to add the code below at Line 304 to see if it works.
If you encounter any problems, please let me know.

if not epipolar_in_rois.any():
    corr = rois.new_zeros((num_rois, 0), dtype=torch.int64)
    mask = rois.new_zeros((num_rois, 0), dtype=torch.bool)
    return corr, mask