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[FA4] Support paged/decode compile specs in compile_flash_attn_varlen_func_from_specs #158

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[FA4] Support paged/decode compile specs in compile_flash_attn_varlen_func_from_specs #158

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21 changes: 20 additions & 1 deletion flash_attn/cute/interface.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2435,6 +2435,7 @@ def compile_flash_attn_varlen_func_from_specs(
v_shape: Tuple[int, ...],
q_dtype: torch.dtype,
v_stride: Optional[Tuple[int, ...]] = None,
k_stride: Optional[Tuple[int, ...]] = None,
cu_seqlens_q_shape: Optional[Tuple[int, ...]] = None,
cu_seqlens_k_shape: Optional[Tuple[int, ...]] = None,
max_seqlen_q: Optional[int] = None,
Expand All @@ -2444,9 +2445,15 @@ def compile_flash_attn_varlen_func_from_specs(
window_size: Tuple[Optional[int], Optional[int]] = (None, None),
num_splits: int = 1,
return_lse: bool = False,
seqused_k_shape: Optional[Tuple[int, ...]] = None,
page_table_shape: Optional[Tuple[int, ...]] = None,
q_descale: bool = False,
k_descale: bool = False,
v_descale: bool = False,
softcap: Optional[float] = None,
):
q = _make_compile_only_tensor_spec(q_shape, q_dtype)
k = _make_compile_only_tensor_spec(k_shape, q_dtype)
k = _make_compile_only_tensor_spec(k_shape, q_dtype, stride=k_stride)
v = _make_compile_only_tensor_spec(v_shape, q_dtype, stride=v_stride)
out = _make_compile_only_tensor_spec(
(*q_shape[:-1], v_shape[-1]),
Expand Down Expand Up @@ -2478,16 +2485,28 @@ def compile_flash_attn_varlen_func_from_specs(
cu_seqlens_k=_make_compile_only_tensor_spec(
cu_seqlens_k_shape, torch.int32, 4
),
seqused_k=_make_compile_only_tensor_spec(seqused_k_shape, torch.int32, 4),
page_table=_make_compile_only_tensor_spec(page_table_shape, torch.int32, 4),
max_seqlen_q=max_seqlen_q,
max_seqlen_k=max_seqlen_k,
softmax_scale=softmax_scale,
causal=causal,
softcap=softcap,
window_size_left=window_size[0],
window_size_right=window_size[1],
num_splits=num_splits,
return_lse=return_lse,
out=out,
lse=lse,
q_descale=_make_compile_only_tensor_spec((1,), torch.float32, 4)
if q_descale
else None,
k_descale=_make_compile_only_tensor_spec((1,), torch.float32, 4)
if k_descale
else None,
v_descale=_make_compile_only_tensor_spec((1,), torch.float32, 4)
if v_descale
else None,
compile_only=True,
)

Expand Down