batch dim mismatch in opus lidar-camera fusion

[wowlegchout]

in sampling_pts_feats function, F.grid_sample requires pts_feats and norm_sample_points to have same batch size dim, however, pts_feats is [B, C, H, W], norm_sample_points is [BG, Q, P, 2], how to unify batch dim? Looking forward to your reply :)

[jbwang1997]

Thank you for your interest for this repo. Here, we have reshaped the LiDAR features as [BG, C, H, W] at this code.