RuntimeError: Only tensors, lists, tuples of tensors, or dictionary of tensors can be output from traced functions.

[chjXu]

when i try to save the ddd_3dop.pth as the ddd_3dop.pt for libtorch, there will be occured the error as "RuntimeError: Only tensors, lists, tuples of tensors, or dictionary of tensors can be output from traced functions.". How to sovled it? please help me, thanks.