`segment_csr` crashes Python when provided invalid `indptr`

[ArchieGertsman]

When I run the following code:

a = torch.arange(10)
indptr = torch.tensor([0]) # invalid ptr
segment_csr(a, indptr)

Python crashes on OSX with the following message:

I'm on version 2.0.9 of torch_scatter.
I think segment_csr should check for bad input like this.

[Matthias Fey]

Yes, the input needs to be

a = torch.arange(10)
indptr = torch.tensor([0, 10]) # invalid ptr
segment_csr(a, indptr)

In general, it is hard to check for invalid inputs in advance since this will lead to costly device transfers (e.g., querying indptr[0] and indptr[-1]).

[github-actions]

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