s3dis dataset :ValueError: need at least one array to concatenate

[Chengyuelan]

/content/drive/Shareddrives/1000/pointnet/pointnet-master/data/stanford_indoor3d/pointcloudscene_0001.npy Traceback (most recent call last): File "gen_indoor3d_h5.py", line 77, in random_sample=False, sample_num=None) File "/content/drive/Shareddrives/1000/pointnet/pointnet-master/sem_seg/indoor3d_util.py", line 254, in room2blocks_wrapper_normalized random_sample, sample_num, sample_aug) File "/content/drive/Shareddrives/1000/pointnet/pointnet-master/sem_seg/indoor3d_util.py", line 230, in room2blocks_plus_normalized random_sample, sample_num, sample_aug) File "/content/drive/Shareddrives/1000/pointnet/pointnet-master/sem_seg/indoor3d_util.py", line 190, in room2blocks return np.concatenate(block_data_list, 0),
File "<array_function internals>", line 6, in concatenate ValueError: need at least one array to concatenate