Nevermind.  I tried that and got the following:
    cat_embedd = torch.cat(embeddings, 0)
RuntimeError: invalid argument 0: Sizes of tensors must match except in dimension 0. Got 1 and 2 in dimension 1 at C:/w/1/s/tmp_conda_3.7_100118/conda/conda-bld/pytorch_1579082551706/work/aten/src\THC/generic/THCTensorMath.cu:71