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vulkan: Use fp16 for the flash attention P*V multiplication (#12783)

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This is consistent with the ggml-cuda behavior and the mul_mat fallback.
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Jeff Bolz 2025-04-09 00:12:57 -05:00 committed by GitHub
parent 7538246e7c
commit 7ecd780b1a
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1 changed files with 4 additions and 2 deletions
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ggml/src/ggml-vulkan/vulkan-shaders/flash_attn_cm2.comp
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@ -330,9 +330,11 @@ void main() {
// resize eM by using smear/reduce
coopMatReduceNV(eMdiag, eM, gl_CooperativeMatrixReduceRowNV, smearReduce);
O = eMdiag * O;
// multiply with fp16 accumulation, then add to O.
coopmat<float16_t, gl_ScopeWorkgroup, Br, D, gl_MatrixUseAccumulator> PV = coopmat<float16_t, gl_ScopeWorkgroup, Br, D, gl_MatrixUseAccumulator>(0);
PV = coopMatMulAdd(P_A, V, PV);
O = coopMatMulAdd(P_A, V, O);
O = eMdiag * O + coopmat<ACC_TYPE, gl_ScopeWorkgroup, Br, D, gl_MatrixUseAccumulator>(PV);
}
// If there is split_k, then the split_k resolve shader does the final