Metapath2vec model

I am not able to execute metapath2vec model in /examples/pytorch/metapath2vec/.
When I load the data from https://www.dropbox.com/s/6gzyxd2xs46w8vp/net_dbis.zip?dl=0&file_subpath=%2Fnet_dbis , I am not able to execute Sampler.py. Is there anyone who have the same problems ?

@BarclayII Can you help on this problem?

PR submitted in https://github.com/dmlc/dgl/pull/1499