A very confusing issues about converting .pt to .onnx

[Greatlover]

Bug
Hi, I'm getting the following error when trying to convert a Pytorch YoloV5 model to ONNX format:

Traceback (most recent call last):

File "E:\yolov5-master\py_to_onnx.py", line 17, in
torch.onnx.export(

File "E:\anaconda\envs\yolo_v5\lib\site-packages\torch\onnx\utils.py", line 504, in export
_export(

File "E:\anaconda\envs\yolo_v5\lib\site-packages\torch\onnx\utils.py", line 1506, in _export
with exporter_context(model, training, verbose):

File "E:\anaconda\envs\yolo_v5\lib\contextlib.py", line 117, in enter
return next(self.gen)

File "E:\anaconda\envs\yolo_v5\lib\site-packages\torch\onnx\utils.py", line 176, in exporter_context
with select_model_mode_for_export(

File "E:\anaconda\envs\yolo_v5\lib\contextlib.py", line 117, in enter
return next(self.gen)

File "E:\anaconda\envs\yolo_v5\lib\site-packages\torch\onnx\utils.py", line 137, in disable_apex_o2_state_dict_hook
for module in model.modules():

AttributeError: 'dict' object has no attribute 'modules'
No matter how I modify the code, using the official YoloV5 models or my own trained models, I get this error when converting to ONNX. Is there any way to resolve this? Any help would be greatly appreciated!

Environment
Python 3.9.0
pytroch 1.13.0+cu116
cuda 11.6
yolov5

Minimal Reproducible Example
Here is the .py code
import torch
import torch.nn

model_file = 'E:\yolov5-master\runs\train\exp9\weights\best.pt'

export_file = 'E:\yolov5-master\export_all\onnxs\try\train\fuck.onnx'

model = torch.load(model_file)

dummy_input = torch.randn(1, 2, 640, 640)

torch.onnx.export(
model,
dummy_input,
export_file,
opset_version=11
)

Additional
Here is the .py code
import torch
import torch.nn

model_file = 'E:\yolov5-master\runs\train\exp9\weights\best.pt'

export_file = 'E:\yolov5-master\export_all\onnxs\try\train\fuck.onnx'

model = torch.load(model_file)

dummy_input = torch.randn(1, 2, 640, 640)

torch.onnx.export(
model,
dummy_input,
export_file,
opset_version=11
)