Pytorch RuntimeError: t() expects a 2D Variable, but self is 3D

RuntimeError: t() expects a 2D Variable, but self is 3D
As of PyTorch v0.2, the .t() function is only applicable to 2D Variables: pytorch/pytorch@8d33603. 

https://github.com/facebookresearch/ParlAI/issues/270
https://discuss.pytorch.org/t/how-to-transpose-3d-matrix-in-pytorch-v0-2/7102