`TypeError: torch.mm received an invalid combination of arguments - got (torch.FloatTensor, Variable), but expected one of:
- (torch.SparseFloatTensor mat1, torch.FloatTensor mat2)
- (torch.FloatTensor source, torch.FloatTensor mat2)
They can, but a function takes either Tensors or Variables as input but not a mix of them.
You should wrap your tensor into a Variable before using it.
不管是张量还是变量都行，但是混合的就不行。
参考：https://github.com/pytorch/pytorch/issues/1252