Function gdn_decode_wyn 

pub fn gdn_decode_wyn(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    h_state: DevicePtr,
    query: DevicePtr,
    key: DevicePtr,
    value: DevicePtr,
    gate: DevicePtr,
    beta: DevicePtr,
    output: DevicePtr,
    h_state_inter_base: DevicePtr,
    inter_stride_floats: u32,
    batch_size: u32,
    num_k_heads: u32,
    num_v_heads: u32,
    k_dim: u32,
    v_dim: u32,
    qk_stride: u32,
    v_stride: u32,
    gb_stride: u32,
    stream: u64,
) -> Result<()>

WY-Chunkwise Gated Delta Rule, pool-layout intermediates — K-generic launch shared by the K=17 DFlash verify (gated_delta_rule_wy17) and the chain-verify K∈{5..8} instantiations (gated_delta_rule_wy5..wy8, one templated source gated_delta_rule_wyn.cu). K is compile-time in the kernel; the caller selects it via the kernel handle. Computes K H·k dot products in 1 pass over H, applies WY algebraic correction over K tokens (K*(K-1)/2 inter-token k-dots), then applies K state updates in a second fused pass writing Hi_0..Hi_{K-2} + final H.

h_state_inter_base points to a contiguous pool of (K-1) intermediate H states per (layer, slot). Each Hi_t is at h_state_inter_base + t * inter_stride_floats (per (b, vh) sub-region).