How to solve this runtime error problem?

[sunshine-lcc]

I met the problem when I ran the instruction "python3 detect.py --images imgs --det det"
What should I do to solve this problem and why it happened?

Traceback (most recent call last):
File "detect.py", line 234, in
output = torch.cat((output,prediction))
RuntimeError: invalid argument 0: Sizes of tensors must match except in dimension 0. Got 86 and 8 in dimension 1 at /opt/conda/conda-bld/pytorch_1544176307774/work/aten/src/THC/generic/THCTensorMath.cu:83

[lilxmx]

I met the same one， have you resolve it?