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fix Flash Attention kernel not found issue. #322

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fix Flash Attention kernel not found issue. #322

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8 changes: 3 additions & 5 deletions sam2/modeling/sam/transformer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
import torch
import torch.nn.functional as F
from torch import nn, Tensor
from torch.nn.attention import SDPBackend

from sam2.modeling.position_encoding import apply_rotary_enc, compute_axial_cis
from sam2.modeling.sam2_utils import MLP
Expand All @@ -33,11 +34,8 @@ def sdp_kernel_context(dropout_p):
if ALLOW_ALL_KERNELS:
return contextlib.nullcontext()

return torch.backends.cuda.sdp_kernel(
enable_flash=USE_FLASH_ATTN,
# if Flash attention kernel is off, then math kernel needs to be enabled
enable_math=(OLD_GPU and dropout_p > 0.0) or MATH_KERNEL_ON,
enable_mem_efficient=OLD_GPU,
return torch.nn.attention.sdpa_kernel(
[SDPBackend.FLASH_ATTENTION,SDPBackend.EFFICIENT_ATTENTION,SDPBackend.MATH]
)


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