pub fn nvfp4_grouped_down(
a: u64,
packed_ptrs: &[u64],
sfb_ptrs: &[u64],
scale2_vals: &[f32],
c: u64,
expert_offsets_host: &[i32],
n: u32,
k: u32,
stream: u64,
) -> Result<()>Expand description
2026-09-25: Grouped NVFP4 down projection, one kGrouped launch. a is the
bf16 intermediate [M_total, K], already in expert order (no gather).
packed_ptrs and sfb_ptrs hold one device pointer per expert to a
[N,K/2] weight and its swizzled SFB scales; scale2_vals and
expert_offsets_host are host arrays. Writes c [M_total, N].