title: Any method to transform 'DGL.heterograph' to 'torch_geometric' graph?
body: <p>I'm using dgl library since it was easy to understand..
  But I need several modules in torch_geometric, but they don't support dgl graph.</p>
  <p>Is there any way to change dgl graph to torch_geometric graph?
  My datasets are built in dgl graph, and I'm gonna change them into torch_geometric graph when I load the dataset.</p>