在自定义数据集上使用roboflow对象检测Yolov4 pytorch模型时出现值错误

Question

我们使用Roboflow对我们的自定义数据集使用Yolov4 Pytorch模型进行目标检测。在训练过程中，我们得到以下错误。

Traceback (most recent call last):
  File "./pytorch-YOLOv4/train.py", line 447, in <module>
    device=device, )
  File "./pytorch-YOLOv4/train.py", line 310, in train
    for i, batch in enumerate(train_loader):
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/dataloader.py", line 345, in __next__
    data = self._next_data()
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/dataloader.py", line 856, in _next_data
    return self._process_data(data)
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/dataloader.py", line 881, in _process_data
    data.reraise()
  File "/usr/local/lib/python3.7/dist-packages/torch/_utils.py", line 394, in reraise
    raise self.exc_type(msg)
ValueError: Caught ValueError in DataLoader worker process 7.
Original Traceback (most recent call last):
  File "/content/pytorch-YOLOv4/dataset.py", line 382, in __getitem__
    out_bboxes1[:min(out_bboxes.shape[0], self.cfg.boxes)] = out_bboxes[:min(out_bboxes.shape[0], self.cfg.boxes)]
AttributeError: 'list' object has no attribute 'shape'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/_utils/worker.py", line 178, in _worker_loop
    data = fetcher.fetch(index)
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/usr/local/lib/python3.7/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/content/pytorch-YOLOv4/dataset.py", line 385, in __getitem__
    out_bboxes1[:min(out_bboxes.shape[0], self.cfg.boxes)] = out_bboxes[:min(out_bboxes.shape[0], self.cfg.boxes)]
ValueError: could not broadcast input array from shape (0) into shape (0,5)

Answer 1

out_bboxes1[:min(out_bboxes.shape[0], self.cfg.boxes)] \
    = out_bboxes[:min(out_bboxes.shape[0], self.cfg.boxes)]

第一个错误是你的参数out_bboxes没有‘list’属性，因为它是一个said对象。因此，您可以考虑根据需要更改它的数据类型。