ValueError: need at least one array to concatenate while training on custom data

[assia855]

Hi, thanks for sharing this work. I would like to train the model on custom data and I have a data with coco annotation format and I have this error while launching the training with coco weight:
Traceback (most recent call last): File "tools/train.py", line 191, in <module> main() File "tools/train.py", line 187, in main meta=meta) File "/mmdet/apis/train.py", line 172, in train_detector runner.run(data_loaders, cfg.workflow) File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/mmcv/runner/epoch_based_runner.py", line 127, in run epoch_runner(data_loaders[i], **kwargs) File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/mmcv/runner/epoch_based_runner.py", line 47, in train for i, data_batch in enumerate(self.data_loader): File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 352, in __iter__ return self._get_iterator() File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 294, in _get_iterator return _MultiProcessingDataLoaderIter(self) File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 827, in __init__ self._reset(loader, first_iter=True) File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 857, in _reset self._try_put_index() File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 1091, in _try_put_index index = self._next_index() File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 427, in _next_index return next(self._sampler_iter) # may raise StopIteration File "/anaconda3/envs/open-mmlab/lib/python3.7/site-packages/torch/utils/data/sampler.py", line 227, in __iter__ for idx in self.sampler: File "/work/boxlevelset/mmdet/datasets/samplers/group_sampler.py", line 36, in __iter__ indices = np.concatenate(indices) File "<__array_function__ internals>", line 6, in concatenate ValueError: need at least one array to concatenate

[LiWentomng]

Hi, have you solved this problem? I guess your data may be something wrong ? Please check the your annotations with the standard coco.