Function rope_yarn 

pub fn rope_yarn(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    q: DevicePtr,
    k: DevicePtr,
    positions: DevicePtr,
    seq_len: u32,
    num_q_heads: u32,
    num_kv_heads: u32,
    head_dim: u32,
    rotary_dim: u32,
    inv_freq: DevicePtr,
    theta: f32,
    stream: u64,
) -> Result<()>

RoPE with precomputed YaRN inv_freq table (Mistral Small 4). The kernel reads frequencies from the table instead of computing from theta.