yolov5训练时卡住0%解决方案

用yolov5训练从labelImg标注的数据时，训练时一直卡在0%：

Image sizes 640 train, 640 val
Using 4 dataloader workers
Logging results to runs/train/exp4
Starting training for 10 epochs...

     Epoch   gpu_mem       box       obj       cls    labels  img_size
  0%|          | 0/3 [00:00<?, ?it/s]                                           

将workers改为0:

成功：