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Update 2024-08-07-flexattention.md #1707

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Update 2024-08-07-flexattention.md
Chillee Aug 13, 2024
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Merge branch 'site' into Chillee-patch-1
cjyabraham Aug 13, 2024
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6 changes: 3 additions & 3 deletions _posts/2024-08-07-flexattention.md
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Expand Up @@ -218,12 +218,12 @@ def sliding_window_causal(b, h, q_idx, kv_idx):
return causal_mask & window_mask

# If you want to be cute...
from torch.nn.attention import or_masks
from torch.nn.attention import and_masks

def sliding_window(b, h, q_idx, kv_idx)
return q_idx - kv_idx <= SLIDING_WINDOW

sliding_window_causal = or_masks(causal_mask, sliding_window)
sliding_window_causal = and_masks(causal_mask, sliding_window)
```

We benchmark it against `F.scaled_dot_product_attention` with a sliding window mask as well as FA2 with a causal mask (as a reference point for performance). Not only are we significantly faster than `F.scaled_dot_product_attention`, we’re *also* significantly faster than FA2 with a causal mask as this mask has significantly more sparsity.
Expand Down Expand Up @@ -479,4 +479,4 @@ We want to highlight some prior work (and people) that have inspired FlexAttenti
- The Jax team's work on SplashAttention
- Philippe Tillet and Keren Zhou for helping us with Triton
- Ali Hassani for discussions on neighborhood attention
- Everybody who's complained about attention kernels not supporting their favorite attention variant :)
- Everybody who's complained about attention kernels not supporting their favorite attention variant :)