Function moe_expert_gate_up_act_bf16_grouped 

pub fn moe_expert_gate_up_act_bf16_grouped(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    gate_ptrs: DevicePtr,
    up_ptrs: DevicePtr,
    act: DevicePtr,
    expert_offsets: DevicePtr,
    sorted_token_ids: DevicePtr,
    active_experts: DevicePtr,
    active_count: DevicePtr,
    sh_gate: DevicePtr,
    sh_up: DevicePtr,
    sh_act: DevicePtr,
    n: u32,
    k: u32,
    cap: u32,
    num_tokens: u32,
    stream: u64,
) -> Result<()>

2026-10-02: Grouped BF16 gate+up and SiLU. gate_ptrs / up_ptrs are device tables of each routed expert’s [n, k] BF16 weight; sh_gate / sh_up the shared expert’s. Writes the SiLU product as BF16 hi + lo rows ([positions, 2n] into act, [num_tokens, 2n] into sh_act).