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Fixed the bug from metis if num_parts == 1 #68

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Merged
merged 2 commits into from
Jun 23, 2020
Merged

Fixed the bug from metis if num_parts == 1 #68

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45a4d98
fix the bug from metis if num_parts == 1
james77777778 Jun 22, 2020
eb8c2ec
cleanup
rusty1s Jun 23, 2020
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5 changes: 5 additions & 0 deletions test/test_metis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,3 +30,8 @@ def test_metis(device):
weighted=False)
assert partptr.numel() == 3
assert perm.numel() == 6

_, partptr, perm = mat.partition(num_parts=1, recursive=False,
weighted=True)
assert partptr.numel() == 2
assert perm.numel() == 6
7 changes: 7 additions & 0 deletions torch_sparse/metis.py
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Expand Up @@ -22,6 +22,13 @@ def weight2metis(weight: torch.Tensor) -> Optional[torch.Tensor]:
def partition(src: SparseTensor, num_parts: int, recursive: bool = False,
weighted=False
) -> Tuple[SparseTensor, torch.Tensor, torch.Tensor]:

assert num_parts >= 1
if num_parts == 1:
partptr = torch.tensor([0, src.size(0)], device=src.device())
perm = torch.arange(src.size(0), device=src.device())
return src, partptr, perm

rowptr, col, value = src.csr()
rowptr, col = rowptr.cpu(), col.cpu()

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