llama + spec: MTP Support (llama/22673)

* spec: support MTP

* fix batch size

* rename files

* cont : simplify (llama/7)

* MTP: clean-up (llama/9)

* MTP: clean-up

* review: use llama_context_type instead of llama_graph_type

* review: remove llama_model_has_mtp

* review: fix convert issues

* convert: fix pycheck

* review: formatting

* use `mtp-` for identifying mtp models

* convert: fix mtp conversion

* mtp -> draft-mtp

* remove unused llama_arch

* add need_embd in speculative

* llama: allow partial seq_rm for GDN models for speculative decoding

Currently speculative checkpoint needs to restart from a checkpoint
after some draft tokens are not accepted, this leads to some wastage in
running the target again. This PR adds the ability to rollback upto
`draft_max` by storing the GDN intermediates.

* fix pending state

* vulkan: add GDN partial rollback

* meta: extend check to axis 1

* metal: add GDN partial rollback

Extend the gated delta net kernel to store intermediate states for
partial rollback support on the Metal backend.

- Add K (snapshot slot count) as a function constant
- Read input state from slot 0 of the 3D state tensor
- Write intermediate states to different slots during token loop
- For K=1, maintain backward-compatible single-slot behavior

Ref: 8c05923630

Assisted-by: llama.cpp:local pi

* delta_net_base: use ggml_pad instead of new_tensor

* review: add need_rs_seq

* review: rename part_bounded to n_rs

* review: deslop comments

* review: rename, add asserts

* server : adjust checkpoint logic (llama/11)

* server : adjust checkpoint logic

* cont : rm asserts

* server-context: fix early exit

* spec : fix compatibility with n-gram and add TODOs (llama/13)

* metal : cleanup

* llama : fix faulty bitwise check in recurrent memory

* server : disable RS-based MTP in combination with other spec types

* spec : add TODOs

* cont : fix comment

* cont : update comment

* common : fix logic for ngram + mtp compat

* llama-memory: enable checkpointing with partial rollback

* cont: add test-case for loading into a dirty ctx

* llama-memory-recurrent: clear rs_idx in clear

* download: fix mtp path

* llama-arch: fix enorm op

* docs: update docs

* conversion: fix type annotations

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Aman Gupta 2026-05-16 20:06:23 +08:00 committed by Georgi Gerganov
parent 18a61f44b6
commit 23f956de33
10 changed files with 188 additions and 57 deletions

View File

@ -2541,6 +2541,11 @@ extern "C" {
// TODO: add ggml_gated_delta_net_set_bcast() to be able to configure Q, K broadcast type: tiled vs interleaved [TAG_GGML_GDN_BCAST]
// ref: https://github.com/ggml-org/llama.cpp/pull/19468#discussion_r2786394306
//
// state is a 3D tensor of shape (S_v*S_v*H, K, n_seqs):
// K == 1: output carries the final state only.
// K > 1: output carries K snapshot slots; the kernel writes the last min(n_tokens, K)
// per-token snapshots into the trailing slots
GGML_API struct ggml_tensor * ggml_gated_delta_net(
struct ggml_context * ctx,
struct ggml_tensor * q,

View File

@ -753,7 +753,9 @@ static struct ggml_backend_meta_split_state ggml_backend_meta_get_split_state(co
GGML_ASSERT(src_ss[2].axis == GGML_BACKEND_SPLIT_AXIS_1);
GGML_ASSERT(src_ss[3].axis == GGML_BACKEND_SPLIT_AXIS_1);
GGML_ASSERT(src_ss[4].axis == GGML_BACKEND_SPLIT_AXIS_1);
GGML_ASSERT(src_ss[5].axis == GGML_BACKEND_SPLIT_AXIS_2);
// state shape is (S_v*S_v*H, K, n_seqs); the heads dim is nested inside axis 0,
// so a head-aligned split on the input cache reshapes to axis 0 here (not axis 2).
GGML_ASSERT(src_ss[5].axis == GGML_BACKEND_SPLIT_AXIS_2 || src_ss[5].axis == GGML_BACKEND_SPLIT_AXIS_1 || src_ss[5].axis == GGML_BACKEND_SPLIT_AXIS_0);
return {GGML_BACKEND_SPLIT_AXIS_0, {0}, 1};
};
@ -2140,4 +2142,3 @@ ggml_backend_t ggml_backend_meta_simple_backend(ggml_backend_t meta_backend, siz
const ggml_backend_meta_context * backend_ctx = (const ggml_backend_meta_context *) meta_backend->context;
return backend_ctx->backend_configs[index].backend;
}

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@ -2943,7 +2943,9 @@ struct ggml_cplan ggml_graph_plan(
case GGML_OP_GATED_DELTA_NET:
{
const int64_t S_v = node->src[2]->ne[0];
cur = S_v * sizeof(float) * n_tasks;
const int64_t K = node->src[5]->ne[1]; // state is (D, K, n_seqs)
const int64_t per_thread = S_v + (K > 1 ? S_v * S_v : 0);
cur = per_thread * sizeof(float) * n_tasks;
} break;
case GGML_OP_COUNT:
{

View File

@ -10513,19 +10513,30 @@ static void ggml_compute_forward_gated_delta_net_one_chunk(
const bool kda = (neg0 == S_v);
// scratch layout per thread: [delta(S_v)]
const int64_t scratch_per_thread = S_v;
// state is 3D (S_v*S_v*H, K, n_seqs); K is the snapshot slot count.
const int64_t K = src_state->ne[1];
GGML_ASSERT(K >= 1);
// per-seq stride in floats (slot 0 of seq s lives at state + s * seq_stride)
const int64_t state_seq_stride = src_state->nb[2] / sizeof(float);
const int64_t per_thread = S_v + (K > 1 ? S_v * S_v : 0);
const int ith = params->ith;
float * delta = (float *)params->wdata + ith * scratch_per_thread + CACHE_LINE_SIZE_F32;
float * delta = (float *)params->wdata + ith * per_thread + CACHE_LINE_SIZE_F32;
float * state_work = K > 1 ? (delta + S_v) : nullptr;
// output layout: [attn_scores | new_states]
// attn_scores: S_v * H * n_tokens * n_seqs floats
// new_states: S_v * S_v * H * n_seqs floats
const int64_t attn_score_elems = S_v * H * n_tokens * n_seqs;
// attn_scores: S_v * H * n_tokens * n_seqs floats
// new_states: S_v * S_v * H * n_seqs * K floats (K snapshot slots; last min(n_tokens, K))
const int64_t attn_score_elems = S_v * H * n_tokens * n_seqs;
const int64_t state_size_per_snap = S_v * S_v * H * n_seqs;
float * attn_out_base = (float *)dst->data;
float * state_out_base = (float *)dst->data + attn_score_elems;
// snapshot slot mapping: target_slot = t - shift. When n_tokens < K only the last
// n_tokens slots are written; earlier slots are left untouched (caller-owned).
const int64_t shift = n_tokens - K;
const float * state_in_base = (const float *)src_state->data;
//const int64_t rq1 = nev1 / neq1;
@ -10545,10 +10556,15 @@ static void ggml_compute_forward_gated_delta_net_one_chunk(
const int64_t iq3 = iv3 / rq3;
const int64_t ik3 = iv3 / rk3;
float * s_out = state_out_base + (iv3 * H + iv1) * S_v * S_v;
// For K=1, write directly to the single output slot to avoid an extra memcpy at the end.
// For K>1, work in scratch and copy out per-token when the slot is in range.
float * s_out = (K > 1)
? state_work
: state_out_base + (iv3 * H + iv1) * S_v * S_v;
// copy input state into output buffer and operate in-place
const float * s_in = state_in_base + (iv3 * H + iv1) * S_v * S_v;
// copy input state into the working buffer and operate in-place
// state layout (D, K, n_seqs): slot 0 of seq iv3 starts at iv3 * state_seq_stride.
const float * s_in = state_in_base + iv3 * state_seq_stride + iv1 * S_v * S_v;
memcpy(s_out, s_in, S_v * S_v * sizeof(float));
// attn output pointer for first token of this (head, seq)
@ -10598,6 +10614,15 @@ static void ggml_compute_forward_gated_delta_net_one_chunk(
}
attn_data += S_v * H; // advance to next token
if (K > 1) {
const int64_t target_slot = t - shift;
if (target_slot >= 0 && target_slot < K) {
float * curr_state_o = state_out_base + target_slot * state_size_per_snap +
(iv3 * H + iv1) * S_v * S_v;
memcpy(curr_state_o, s_out, S_v * S_v * sizeof(float));
}
}
}
}
}

View File

@ -1,6 +1,6 @@
#include "gated_delta_net.cuh"
template <int S_v, bool KDA>
template <int S_v, bool KDA, bool keep_rs_t>
__global__ void __launch_bounds__((ggml_cuda_get_physical_warp_size() < S_v ? ggml_cuda_get_physical_warp_size() : S_v) * 4, 2)
gated_delta_net_cuda(const float * q,
const float * k,
@ -23,7 +23,8 @@ gated_delta_net_cuda(const float * q,
int64_t sb3,
const uint3 neqk1_magic,
const uint3 rq3_magic,
float scale) {
float scale,
int K) {
const uint32_t h_idx = blockIdx.x;
const uint32_t sequence = blockIdx.y;
// each warp owns one column, using warp-level primitives to reduce across rows
@ -37,9 +38,13 @@ gated_delta_net_cuda(const float * q,
float * attn_data = dst;
float * state = dst + attn_score_elems;
const int64_t state_offset = (sequence * H + h_idx) * S_v * S_v;
state += state_offset;
curr_state += state_offset + col * S_v;
// input state layout (D, K, n_seqs) — seq stride is K * D = K * H * S_v * S_v.
// output state layout (per-slot D * n_seqs) — same per-(seq,head) offset as before.
const int64_t state_in_offset = sequence * K * H * S_v * S_v + h_idx * S_v * S_v;
const int64_t state_out_offset = (sequence * H + h_idx) * S_v * S_v;
const int64_t state_size_per_token = S_v * S_v * H * n_seqs; // per-slot stride in output
state += state_out_offset;
curr_state += state_in_offset + col * S_v;
attn_data += (sequence * n_tokens * H + h_idx) * S_v;
constexpr int warp_size = ggml_cuda_get_physical_warp_size() < S_v ? ggml_cuda_get_physical_warp_size() : S_v;
@ -54,6 +59,10 @@ gated_delta_net_cuda(const float * q,
s_shard[r] = curr_state[i];
}
// slot mapping: target_slot = t - shift. When n_tokens < K only the last n_tokens slots
// are written; earlier slots are left untouched (caller-owned).
const int shift = (int) n_tokens - K;
for (int t = 0; t < n_tokens; t++) {
const float * q_t = q + iq3 * sq3 + t * sq2 + iq1 * sq1;
const float * k_t = k + iq3 * sq3 + t * sq2 + iq1 * sq1;
@ -135,17 +144,30 @@ gated_delta_net_cuda(const float * q,
}
attn_data += S_v * H;
if constexpr (keep_rs_t) {
const int target_slot = t - shift;
if (target_slot >= 0 && target_slot < K) {
float * curr_state = (dst + attn_score_elems) + target_slot * state_size_per_token + state_out_offset;
#pragma unroll
for (int r = 0; r < rows_per_lane; r++) {
const int i = r * warp_size + lane;
curr_state[col * S_v + i] = s_shard[r];
}
}
}
}
// Write state back to global memory (transposed layout)
if constexpr (!keep_rs_t) {
#pragma unroll
for (int r = 0; r < rows_per_lane; r++) {
const int i = r * warp_size + lane;
state[col * S_v + i] = s_shard[r];
for (int r = 0; r < rows_per_lane; r++) {
const int i = r * warp_size + lane;
state[col * S_v + i] = s_shard[r];
}
}
}
template <bool KDA>
template <bool KDA, bool keep_rs_t>
static void launch_gated_delta_net(
const float * q_d, const float * k_d, const float * v_d,
const float * g_d, const float * b_d, const float * s_d,
@ -155,7 +177,7 @@ static void launch_gated_delta_net(
int64_t sv1, int64_t sv2, int64_t sv3,
int64_t sb1, int64_t sb2, int64_t sb3,
int64_t neqk1, int64_t rq3,
float scale, cudaStream_t stream) {
float scale, int K, cudaStream_t stream) {
//TODO: Add chunked kernel for even faster pre-fill
const int warp_size = ggml_cuda_info().devices[ggml_cuda_get_device()].warp_size;
const int num_warps = 4;
@ -169,29 +191,29 @@ static void launch_gated_delta_net(
switch (S_v) {
case 16:
gated_delta_net_cuda<16, KDA><<<grid_dims, block_dims, 0, stream>>>(
gated_delta_net_cuda<16, KDA, keep_rs_t><<<grid_dims, block_dims, 0, stream>>>(
q_d, k_d, v_d, g_d, b_d, s_d, dst_d, H,
n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale);
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale, K);
break;
case 32:
gated_delta_net_cuda<32, KDA><<<grid_dims, block_dims, 0, stream>>>(
gated_delta_net_cuda<32, KDA, keep_rs_t><<<grid_dims, block_dims, 0, stream>>>(
q_d, k_d, v_d, g_d, b_d, s_d, dst_d, H,
n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale);
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale, K);
break;
case 64: {
gated_delta_net_cuda<64, KDA><<<grid_dims, block_dims, 0, stream>>>(
gated_delta_net_cuda<64, KDA, keep_rs_t><<<grid_dims, block_dims, 0, stream>>>(
q_d, k_d, v_d, g_d, b_d, s_d, dst_d, H,
n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale);
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale, K);
break;
}
case 128: {
gated_delta_net_cuda<128, KDA><<<grid_dims, block_dims, 0, stream>>>(
gated_delta_net_cuda<128, KDA, keep_rs_t><<<grid_dims, block_dims, 0, stream>>>(
q_d, k_d, v_d, g_d, b_d, s_d, dst_d, H,
n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale);
sb1, sb2, sb3, neqk1_magic, rq3_magic, scale, K);
break;
}
default:
@ -261,13 +283,29 @@ void ggml_cuda_op_gated_delta_net(ggml_backend_cuda_context & ctx, ggml_tensor *
cudaStream_t stream = ctx.stream();
// state is 3D (S_v*S_v*H, K, n_seqs); K is the snapshot slot count.
const int K = (int) src_state->ne[1];
const bool keep_rs = K > 1;
if (kda) {
launch_gated_delta_net<true>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, stream);
if (keep_rs) {
launch_gated_delta_net<true, true>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, K, stream);
} else {
launch_gated_delta_net<true, false>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, K, stream);
}
} else {
launch_gated_delta_net<false>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, stream);
if (keep_rs) {
launch_gated_delta_net<false, true>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, K, stream);
} else {
launch_gated_delta_net<false, false>(q_d, k_d, v_d, g_d, b_d, s_d, dst_d,
S_v, H, n_tokens, n_seqs, sq1, sq2, sq3, sv1, sv2, sv3,
sb1, sb2, sb3, neqk1, rq3, scale, K, stream);
}
}
}

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@ -590,6 +590,8 @@ ggml_metal_pipeline_with_params ggml_metal_library_get_pipeline_gated_delta_net(
const int ne20 = op->src[2]->ne[0]; // S_v
const int ne21 = op->src[2]->ne[1]; // H
const int ne30 = op->src[3]->ne[0]; // G
// state is src[5], 3D (S_v*S_v*H, K, n_seqs); K is the snapshot slot count.
const int K = op->src[5]->ne[1];
const int nsg = op->src[2]->ne[0]/32;
@ -598,7 +600,7 @@ ggml_metal_pipeline_with_params ggml_metal_library_get_pipeline_gated_delta_net(
GGML_ASSERT(ne20 % 32 == 0);
snprintf(base, 256, "kernel_gated_delta_net_%s_%d", ggml_type_name(op->src[0]->type), nsg);
snprintf(name, 256, "%s_ne20=%d_ne30=%d", base, ne20, ne30);
snprintf(name, 256, "%s_ne20=%d_ne30=%d_K=%d", base, ne20, ne30, K);
ggml_metal_pipeline_with_params res = ggml_metal_library_get_pipeline(lib, name);
if (!res.pipeline) {
@ -606,6 +608,7 @@ ggml_metal_pipeline_with_params ggml_metal_library_get_pipeline_gated_delta_net(
ggml_metal_cv_set_int16(cv, ne20, FC_GATED_DELTA_NET + 0);
ggml_metal_cv_set_int16(cv, ne30, FC_GATED_DELTA_NET + 1);
ggml_metal_cv_set_int16(cv, K, FC_GATED_DELTA_NET + 2);
res = ggml_metal_library_compile_pipeline(lib, base, name, cv);

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@ -2531,6 +2531,7 @@ kernel void kernel_rwkv_wkv7_f32(
constant short FC_gated_delta_net_ne20 [[function_constant(FC_GATED_DELTA_NET + 0)]];
constant short FC_gated_delta_net_ne30 [[function_constant(FC_GATED_DELTA_NET + 1)]];
constant short FC_gated_delta_net_K [[function_constant(FC_GATED_DELTA_NET + 2)]];
#if 1
template<short NSG>
@ -2548,21 +2549,24 @@ kernel void kernel_gated_delta_net_impl(
uint3 ntg[[threads_per_threadgroup]]) {
#define S_v FC_gated_delta_net_ne20
#define G FC_gated_delta_net_ne30
#define K FC_gated_delta_net_K
const uint tx = tpitg.x;
const uint ty = tpitg.y;
const uint i23 = tgpig.z; // B
const uint i21 = tgpig.y; // H
const uint i20 = tgpig.x*NSG + ty;
const uint i23 = tgpig.z; // B (n_seqs)
const uint i21 = tgpig.y; // H (head)
const uint i20 = tgpig.x*NSG + ty; // row within S_v
const uint i01 = i21 % args.ne01;
const uint i11 = i21 % args.ne11;
const float scale = 1.0f / sqrt((float)S_v);
// input state layout (D, K, n_seqs): per-seq stride is K*H*D; we read slot 0.
// state is stored transposed: M[i20][is] = S[is][i20], so row i20 is contiguous
device const float * s_ptr = (device const float *) (s) + (i23*args.ne21 + i21)*S_v*S_v + i20*S_v;
const uint state_in_base = (i23*K*args.ne21 + i21)*S_v*S_v + i20*S_v;
device const float * s_ptr = (device const float *) (s) + state_in_base;
float ls[NSG];
@ -2580,6 +2584,17 @@ kernel void kernel_gated_delta_net_impl(
device const float * b_ptr = (device const float *) (b) + (i23*args.ne22*args.ne21 + i21);
device const float * g_ptr = (device const float *) (g) + (i23*args.ne22*args.ne21 + i21)*G;
// snapshot slot mapping: target_slot = t - shift. When n_tokens < K, only the last
// n_tokens slots are written; earlier slots are left untouched (caller-owned).
const int shift = (int)args.ne22 - (int)K;
// output state base offset: after attention scores
const uint attn_size = args.ne22 * args.ne21 * S_v * args.ne23;
// output state per-slot size: S_v * S_v * H * n_seqs
const uint state_size_per_snap = S_v * S_v * args.ne21 * args.ne23;
// per-(seq,head) offset within a slot
const uint state_out_base = (i23*args.ne21 + i21)*S_v*S_v + i20*S_v;
for (short t = 0; t < args.ne22; t++) {
float s_k = 0.0f;
@ -2627,17 +2642,30 @@ kernel void kernel_gated_delta_net_impl(
b_ptr += args.ne21;
g_ptr += args.ne21*G;
if (K > 1u) {
const int target_slot = (int)t - shift;
if (target_slot >= 0 && target_slot < (int)K) {
device float * dst_state = (device float *) (dst) + attn_size + (uint)target_slot * state_size_per_snap + state_out_base;
FOR_UNROLL (short j = 0; j < NSG; j++) {
const short is = tx*NSG + j;
dst_state[is] = ls[j];
}
}
}
}
device float * dst_state = (device float *) (dst) + args.ne23*args.ne22*args.ne21*S_v + (i23*args.ne21 + i21)*S_v*S_v + i20*S_v;
FOR_UNROLL (short j = 0; j < NSG; j++) {
const short is = tx*NSG + j;
dst_state[is] = ls[j];
if (K == 1u) {
device float * dst_state = (device float *) (dst) + attn_size + state_out_base;
FOR_UNROLL (short j = 0; j < NSG; j++) {
const short is = tx*NSG + j;
dst_state[is] = ls[j];
}
}
#undef S_v
#undef G
#undef K
}
typedef decltype(kernel_gated_delta_net_impl<4>) kernel_gated_delta_net_t;

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@ -1506,6 +1506,7 @@ struct vk_op_gated_delta_net_push_constants {
uint32_t sb1, sb2, sb3;
uint32_t neq1, rq3;
float scale;
uint32_t K;
};
struct vk_op_ssm_scan_push_constants {
@ -10767,6 +10768,7 @@ static void ggml_vk_gated_delta_net(ggml_backend_vk_context * ctx, vk_context& s
const ggml_tensor * src_q = dst->src[0];
const ggml_tensor * src_v = dst->src[2];
const ggml_tensor * src_beta = dst->src[4];
const ggml_tensor * src_state = dst->src[5];
GGML_ASSERT(dst->buffer != nullptr);
@ -10775,6 +10777,9 @@ static void ggml_vk_gated_delta_net(ggml_backend_vk_context * ctx, vk_context& s
const uint32_t n_tokens = (uint32_t)src_v->ne[2];
const uint32_t n_seqs = (uint32_t)src_v->ne[3];
// state is 3D (S_v*S_v*H, K, n_seqs); K is the snapshot slot count.
const uint32_t K = (uint32_t)src_state->ne[1];
const uint32_t s_off = S_v * H * n_tokens * n_seqs;
vk_pipeline pipeline = ggml_vk_op_get_pipeline(ctx, dst->src[0], dst->src[1], dst->src[2], dst, dst->op);
@ -10808,7 +10813,8 @@ static void ggml_vk_gated_delta_net(ggml_backend_vk_context * ctx, vk_context& s
sv1, sv2, sv3,
sb1, sb2, sb3,
neq1, rq3,
scale
scale,
K
};
ggml_vk_dispatch_pipeline(ctx, subctx, pipeline,

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@ -31,6 +31,7 @@ layout(push_constant) uniform Parameters {
uint sb1, sb2, sb3;
uint neq1, rq3;
float scale;
uint K;
};
layout(binding = 0) readonly buffer QBuf { FLOAT_TYPE data_q[]; };
@ -101,13 +102,21 @@ void main() {
const uint iq3 = seq_id / rq3;
const uint state_size = S_V * S_V;
const uint state_base = (seq_id * H + head_id) * state_size;
// input state layout (D, K, n_seqs): per-seq stride is K*H*D; we read slot 0.
const uint state_in_base = (seq_id * K * H + head_id) * state_size;
// output state layout per slot: same per-(seq,head) offset as the single-slot case.
const uint state_out_base = (seq_id * H + head_id) * state_size;
const uint state_size_per_snap = state_size * H * n_seqs;
FLOAT_TYPE s_shard[ROWS_PER_LANE];
[[unroll]] for (uint r = 0; r < ROWS_PER_LANE; r++) {
s_shard[r] = FLOAT_TYPE(data_state[state_base + col * S_V + r * LANES_PER_COLUMN + lane]);
s_shard[r] = FLOAT_TYPE(data_state[state_in_base + col * S_V + r * LANES_PER_COLUMN + lane]);
}
// snapshot slot mapping: target_slot = t - shift. When n_tokens < K, only the last
// n_tokens slots are written; earlier slots are left untouched (caller-owned).
const int shift = int(n_tokens) - int(K);
uint attn_off = (seq_id * n_tokens * H + head_id) * S_V;
for (uint t = 0; t < n_tokens; t++) {
@ -161,9 +170,21 @@ void main() {
}
attn_off += S_V * H;
if (K > 1u) {
const int target_slot = int(t) - shift;
if (target_slot >= 0 && target_slot < int(K)) {
const uint slot_base = s_off + uint(target_slot) * state_size_per_snap + state_out_base;
[[unroll]] for (uint r = 0; r < ROWS_PER_LANE; r++) {
data_dst[slot_base + col * S_V + r * LANES_PER_COLUMN + lane] = s_shard[r];
}
}
}
}
[[unroll]] for (uint r = 0; r < ROWS_PER_LANE; r++) {
data_dst[s_off + state_base + col * S_V + r * LANES_PER_COLUMN + lane] = s_shard[r];
if (K == 1u) {
[[unroll]] for (uint r = 0; r < ROWS_PER_LANE; r++) {
data_dst[s_off + state_out_base + col * S_V + r * LANES_PER_COLUMN + lane] = s_shard[r];
}
}
}

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@ -6210,11 +6210,13 @@ struct ggml_tensor * ggml_gated_delta_net(
GGML_ASSERT(g->ne[0] == 1 || g->ne[0] == S_v);
GGML_ASSERT(beta->ne[0] == 1);
GGML_ASSERT(ggml_nelements(state) == S_v * S_v * H * n_seqs);
// concat output and new_state into a single tensor
// output: S_v * H * n_tokens * n_seqs, state: S_v * S_v * H * n_seqs
const int64_t ne[4] = { S_v * H, n_tokens * n_seqs + S_v * n_seqs, 1, 1 };
// state is a 3D tensor (S_v*S_v*H, K, n_seqs). K is the snapshot slot count.
GGML_ASSERT(state->ne[0] == S_v * S_v * H);
GGML_ASSERT(state->ne[2] == n_seqs);
GGML_ASSERT(state->ne[3] == 1);
const int64_t K = state->ne[1];
const int64_t state_rows = K * S_v * n_seqs;
const int64_t ne[4] = { S_v * H, n_tokens * n_seqs + state_rows, 1, 1 };
struct ggml_tensor * result = ggml_new_tensor(ctx, GGML_TYPE_F32, 4, ne);
result->op = GGML_OP_GATED_DELTA_NET;