ValueError: need at least one array to concatenate

[prayagpawar]

loading annotations into memory... Done (t=0.00s) creating index... index created! 2022-11-21 16:08:57,399 - INFO - Start running, host: pdrl@pdrl, work_dir: /home/pdrl/aerialdetection/AerialDetection/work_dirs/faster_rcnn_RoITrans_r50_fpn_1x_dota 2022-11-21 16:08:57,399 - INFO - workflow: [('train', 1)], max: 12 epochs Traceback (most recent call last): File "tools/train.py", line 95, in main() File "tools/train.py", line 91, in main logger=logger) File "/home/pdrl/aerialdetection/AerialDetection/mmdet/apis/train.py", line 61, in train_detector _non_dist_train(model, dataset, cfg, validate=validate) File "/home/pdrl/aerialdetection/AerialDetection/mmdet/apis/train.py", line 197, in _non_dist_train runner.run(data_loaders, cfg.workflow, cfg.total_epochs) File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/mmcv/runner/runner.py", line 359, in run epoch_runner(data_loaders[i], **kwargs) File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/mmcv/runner/runner.py", line 259, in train for i, data_batch in enumerate(data_loader): File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 278, in iter return _MultiProcessingDataLoaderIter(self) File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 709, in init self._try_put_index() File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 826, in _try_put_index index = self._next_index() File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/torch/utils/data/dataloader.py", line 318, in _next_index return next(self.sampler_iter) # may raise StopIteration File "/home/pdrl/anaconda3/envs/AerialDetection/lib/python3.7/site-packages/torch/utils/data/sampler.py", line 200, in iter for idx in self.sampler: File "/home/pdrl/aerialdetection/AerialDetection/mmdet/datasets/loader/sampler.py", line 63, in iter indices = np.concatenate(indices) File "<array_function internals>", line 6, in concatenate ValueError: need at least one array to concatenate when i run train.py i get this