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add error info to indicate no sliding window for triton backward pass #3158

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add error info to indicate no sliding window for triton backward pass #3158

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8 changes: 8 additions & 0 deletions aiter/ops/triton/_triton_kernels/flash_attn_triton_amd/interface_v2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -578,6 +578,14 @@ def varlen_bwd(
"softcap is not supported in varlen_bwd (expected 0.0)."
)

is_sliding_window = (window_size_left >= 0) or (window_size_right >= 0)
if is_sliding_window:
raise NotImplementedError(
f"Sliding window attention is not yet supported in the AMD Triton backward pass "
f"(window_size_left={window_size_left}, window_size_right={window_size_right}). "
f"Use window_size=(-1, -1) for full attention."
)

if DEBUG:
print()
print("varlen_bwd")
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