deploy bug（onnxsim）

[RookieJie]

error at while export onnx with onnxsim by the script from original project.

[SebastianJanampa]

please change the following line

DEIM/tools/deployment/export_onnx.py

Line 54 in 8f28fe6

data = torch.rand(32, 3, 640, 640)

It should be

data = torch.rand(1, 3, 640, 640)