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fix exclusive cumsum calculation #109

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Merged
simonguozirui merged 2 commits into from
Dec 24, 2025
Merged

fix exclusive cumsum calculation #109

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4907b86
fix exclusive cumsum calculation
bkal01 Dec 22, 2025
d1e18fa
check and add changelog
simonguozirui Dec 24, 2025
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2 changes: 2 additions & 0 deletions KernelBench/changelog/v0.1
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@@ -0,0 +1,2 @@
Please refer to KernelBench v0.1 release note
https://scalingintelligence.stanford.edu/blogs/kernelbenchv01/
3 changes: 3 additions & 0 deletions KernelBench/changelog/v0.2
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@@ -0,0 +1,3 @@
Ongoing Effort

Updated Level1/92_cumsum_exclusive.py - Fix exclusive cumsum implementation
4 changes: 2 additions & 2 deletions KernelBench/level1/92_cumsum_exclusive.py
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Expand Up @@ -14,8 +14,8 @@ def __init__(self, dim):
self.dim = dim

def forward(self, x):
exclusive_cumsum = torch.cat((torch.zeros_like(x.select(self.dim, 0).unsqueeze(self.dim)), x), dim=self.dim)[:-1]
return torch.cumsum(exclusive_cumsum, dim=self.dim)
cumsum = torch.cumsum(x.narrow(dim=self.dim, start=0, length=x.size(self.dim)-1), dim=self.dim)
return torch.cat((torch.zeros_like(x.select(self.dim, 0).unsqueeze(self.dim)), cumsum), dim=self.dim)

batch_size = 32768
input_shape = (32768,)
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