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[Common] Gate FP8 THD sink backward on cuDNN 9.26 #3441

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[Common] Gate FP8 THD sink backward on cuDNN 9.26 #3441

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3 changes: 3 additions & 0 deletions transformer_engine/common/fused_attn/fused_attn.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -294,6 +294,9 @@ NVTE_Fused_Attn_Backend nvte_get_fused_attn_backend(
qkv_format == NVTE_QKV_Format::NVTE_BHSD)) ||
((cudnn_runtime_version >= 92300 && (sm_arch_ >= 100 || (sm_arch_ >= 90 && !is_training))) &&
qkv_format == NVTE_QKV_Format::NVTE_THD && supported_ragged_offset_size &&
// cuDNN before 9.26 misindexes ragged FP8 Stats during sink-token backward.
(!is_training || softmax_type == NVTE_Softmax_Type::NVTE_VANILLA_SOFTMAX ||
cudnn_runtime_version >= 92600) &&
(attn_mask_type == NVTE_Mask_Type::NVTE_PADDING_MASK ||
attn_mask_type == NVTE_Mask_Type::NVTE_PADDING_CAUSAL_MASK ||
attn_mask_type == NVTE_Mask_Type::NVTE_PADDING_CAUSAL_BOTTOM_RIGHT_MASK))) &&
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