Drive数据集报错num_samples should be a positive integer value, but got num_samples=0

用Drive视网膜数据集然后用mmsegmention训练显示报错ValueError: num_samples should be a positive integer value, but got num_samples=0

2022-05-14 17:35:21,762 - mmseg - INFO - Loaded 0 images
Traceback (most recent call last):
File "tools/train.py", line 240, in
main()
File "tools/train.py", line 229, in main
train_segmentor(
File "/root/miniconda3/lib/python3.8/site-packages/mmseg/apis/train.py", line 100, in train_segmentor
data_loaders = [build_dataloader(ds, **train_loader_cfg) for ds in dataset]
File "/root/miniconda3/lib/python3.8/site-packages/mmseg/apis/train.py", line 100, in
data_loaders = [build_dataloader(ds, **train_loader_cfg) for ds in dataset]
File "/root/miniconda3/lib/python3.8/site-packages/mmseg/datasets/builder.py", line 148, in build_dataloader
data_loader = DataLoader(
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 268, in init
sampler = RandomSampler(dataset, generator=generator)
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/sampler.py", line 102, in init
raise ValueError("num_samples should be a positive integer "
ValueError: num_samples should be a positive integer value, but got num_samples=0