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This commit adds an optional argument in the `random_walk` function,
namely `return_edge_indices`. The default behaviour is not changed, but
if a user wants to directly use the edges visited by the random walker,
we can return the indices of those edges by setting
`return_edge_indices` to `True`. New cases are also added to the test
suite.

* PyTorch 1.12 support

* update

* Export symbols in the DLL (similar to https://github.com/rusty1s/pytorch_sparse/pull/198)

* Export symbols in the DLL (similar to https://github.com/rusty1s/pytorch_sparse/pull/198)

* Export symbols in the DLL (similar to https://github.com/rusty1s/pytorch_sparse/pull/198

)

* Update setup.py
Co-authored-by: Matthias Fey <matthias.fey@tu-dortmund.de>

* half support

* deprecation

* typo

* test half

* fix test