ValueError: need at least one array to concatenate

[3155827819]

Traceback (most recent call last):
File "/home/zhx/azb/mmrotate-main/tools/train.py", line 192, in
main()
File "/home/zhx/azb/mmrotate-main/tools/train.py", line 181, in main
train_detector(
File "/home/zhx/azb/mmrotate-main/mmrotate/apis/train.py", line 141, in train_detector
runner.run(data_loaders, cfg.workflow)
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/mmcv/runner/epoch_based_runner.py", line 127, in run
epoch_runner(data_loaders[i], **kwargs)
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/mmcv/runner/epoch_based_runner.py", line 47, in train
for i, data_batch in enumerate(self.data_loader):
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 359, in iter
return self._get_iterator()
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 305, in _get_iterator
return _MultiProcessingDataLoaderIter(self)
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 944, in init
self._reset(loader, first_iter=True)
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 975, in _reset
self._try_put_index()
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 1209, in _try_put_index
index = self._next_index()
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 512, in _next_index
return next(self._sampler_iter) # may raise StopIteration
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/torch/utils/data/sampler.py", line 229, in iter
for idx in self.sampler:
File "/home/zhx/anaconda3/envs/bebox/lib/python3.8/site-packages/mmdet/datasets/samplers/group_sampler.py", line 36, in iter
indices = np.concatenate(indices)
File "<array_function internals>", line 180, in concatenate
ValueError: need at least one array to concatenate

[Josh00-Lu]

Same Problem.

[yangxue0827]

Check your data path.
refer to
#35

[yangxue0827]

A related blog: https://icode.best/i/79733546247546

[LFayL]

Same Problem.

[zhangchi621]

大概率是路径问题，仔细确认，我的主路径没问题，训练和测试的子路径出问题了