RuntimeError: The size of tensor a (125) must match the size of tensor b (126) at non-singleton dimension 3

[Leochen9]

Sorry to bother you, but when I am using the VOC2012 dataset for training, the error 'RuntimeError: The size of tensor a (125) must match the size of tensor b (126) at non-singleton dimension 3' will appear during the validation phase. What should I do to resolve it? If you could reply to me, I would greatly appreciate it. Thank you!