Official implementation of our TIV'23 paper: Occupancy-MAE: Self-supervised Pre-training Large-scale LiDAR Point Clouds with Masked Occupancy Autoencoders
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replace argwhere with nonzero, thus could use lower version of torch #27
Since most of the slurm training is with a100 or else, which is may not compatible with torch 1.13, so need to replace argwhere with nonzero.