错误信息

Traceback (most recent call last):
  File "tools/train.py", line 244, in <module>
    main()
  File "tools/train.py", line 233, in main
    train_detector(
  File "/home/christ/dev/repos/railsight/mmdetection-2.25.3/mmdet/apis/train.py", line 244, in train_detector
    runner.run(data_loaders, cfg.workflow)
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/mmcv/runner/epoch_based_runner.py", line 130, in run
    epoch_runner(data_loaders[i], **kwargs)
  File "/home/christ/miniconda3/envs/mmdetection/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/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 368, in __iter__
    return self._get_iterator()
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 314, in _get_iterator
    return _MultiProcessingDataLoaderIter(self)
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 965, in __init__
    self._reset(loader, first_iter=True)
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 996, in _reset
    self._try_put_index()
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 1230, in _try_put_index
    index = self._next_index()
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 521, in _next_index
    return next(self._sampler_iter)  # may raise StopIteration
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/sampler.py", line 226, in __iter__
    for idx in self.sampler:
  File "/home/christ/dev/repos/railsight/mmdetection-2.25.3/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
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/multiprocessing/popen_fork.py", line 27, in poll
    pid, sts = os.waitpid(self.pid, flag)
  File "/home/christ/miniconda3/envs/mmdetection/lib/python3.8/site-packages/torch/utils/data/_utils/signal_handling.py", line 66, in handler
    _error_if_any_worker_fails()
RuntimeError: DataLoader worker (pid 35413) is killed by signal: Terminated.

这是我在尝试使用SSD和MMDetection进行训练时遇到的错误消息。我已经检查了我的数据集，它可以与faster_rcnn一起工作，所以我不明白为什么我在SSD训练中遇到这样的问题。任何建议都是很好的!

_base_ = '../ssd/ssd300_coco.py'
dataset_type = 'CocoDataset'
classes = ('pantograph',)
data = dict(
    train=dict(
        img_prefix='configs/pantograph/train/',
        classes=classes,
        ann_file='configs/pantograph/train/SSDTrain.json',
        dataset=dict(
            ann_file='configs/pantograph/train/SSDTrain.json',
            img_prefix='configs/pantograph/train/')),
    val=dict(
        img_prefix='configs/pantograph/val/',
        classes=classes,
        ann_file='configs/pantograph/val/SSDVal.json'),
    test=dict(
        img_prefix='configs/pantograph/test/',
        classes=classes,
        ann_file='configs/pantograph/test/SSDTest.json'))

以上是我的自定义SSD配置，我试图运行。我已经仔细检查了文件位置，并确保他们都是正确的。