How can I train on nuscenes v1.0-mini?

[zheng0819]

The memory of my computer is not enough to train on nuscenes v1.0, so I try to train on nuscenes v1.0-mini. I change the config file, but an error occurred while training :
Caught ValueError in DataLoader worker process 0.
Original Traceback (most recent call last):
File "/home/yusen0819/anaconda3/envs/vista/lib/python3.7/site-packages/torch/utils/data/_utils/worker.py", line 202, in _worker_loop
data = fetcher.fetch(index)
File "/home/yusen0819/anaconda3/envs/vista/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/home/yusen0819/anaconda3/envs/vista/lib/python3.7/site-packages/torch/utils/data/_utils/fetch.py", line 44, in
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/home/yusen0819/VISTA/det3d/datasets/nuscenes/nuscenes.py", line 193, in getitem
return self.get_sensor_data(idx)
File "/home/yusen0819/VISTA/det3d/datasets/nuscenes/nuscenes.py", line 189, in get_sensor_data
data, _ = self.pipeline(res, info)
File "/home/yusen0819/VISTA/det3d/datasets/pipelines/compose.py", line 25, in call
res, info = t(res, info)
File "/home/yusen0819/VISTA/det3d/datasets/pipelines/preprocess.py", line 96, in call
gt_drop_max_keep=self.gt_drop_max_keep,
File "/home/yusen0819/VISTA/det3d/core/sampler/sample_ops.py", line 247, in sample_all
"points": np.concatenate(s_points_list, axis=0),
File "<array_function internals>", line 6, in concatenate
ValueError: need at least one array to concatenate
File "/home/yusen0819/VISTA/det3d/torchie/trainer/trainer.py", line 389, in train
for i, data_batch in enumerate(data_loader):
File "/home/yusen0819/VISTA/det3d/torchie/trainer/trainer.py", line 542, in run
epoch_runner(data_loaders[i], self.epoch, **kwargs)
File "/home/yusen0819/VISTA/det3d/torchie/apis/train.py", line 336, in train_detector
trainer.run(data_loaders, cfg.workflow, cfg.total_epochs, local_rank=cfg.local_rank)
File "/home/yusen0819/VISTA/tools/train.py", line 126, in main
logger=logger,
File "/home/yusen0819/VISTA/tools/train.py", line 131, in
main()
I cannot handle this error. How can I train on nuscenes v1.0-mini? Thanks.

[AndlollipopDE]

We have not tried to train on the mini version, but the error messages indicate that you may not generate data properly (the database sampling).