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kv-cache : fix non-FA path with virutal sequences

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ggml-ci
This commit is contained in:
Georgi Gerganov
2025-06-24 20:01:05 +03:00
parent 7c6487b22f
commit 8c68219835
1 changed files with 44 additions and 22 deletions
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66
src/llama-kv-cache-unified.cpp
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@@ -803,6 +803,8 @@ llama_kv_cache_unified::slot_info llama_kv_cache_unified::find_slot(const llama_
}
}
assert(res.s1 >= res.s0);
return res;
}
@@ -908,13 +910,8 @@ ggml_tensor * llama_kv_cache_unified::get_k(ggml_context * ctx, int32_t il, uint
auto * k = layers[ikv].k;
assert(sinfo.s1 >= sinfo.s0);
const uint32_t ns = sinfo.s1 - sinfo.s0 + 1;
assert(ns > 0);
assert(ns <= n_seq_virt);
const uint64_t size_virt = ggml_row_size(k->type, hparams.n_embd_k_gqa(il)*get_size());
return ggml_view_4d(ctx, k,
@@ -932,9 +929,6 @@ ggml_tensor * llama_kv_cache_unified::get_v(ggml_context * ctx, int32_t il, uint
const uint32_t ns = sinfo.s1 - sinfo.s0 + 1;
assert(ns > 0);
assert(ns <= n_seq_virt);
const uint64_t size_virt = ggml_row_size(v->type, hparams.n_embd_v_gqa(il)*get_size());
if (!v_trans) {
@@ -967,9 +961,20 @@ ggml_tensor * llama_kv_cache_unified::cpy_k(ggml_context * ctx, ggml_tensor * k_
k_cur = ggml_reshape_2d(ctx, k_cur, k->ne[0], n_tokens);
if (kv_idxs && supports_set_rows) {
k = ggml_reshape_2d(ctx, k, k->ne[0], k->ne[1]*k->ne[2]);
const uint32_t ns = sinfo.s1 - sinfo.s0 + 1;
return ggml_set_rows(ctx, k, k_cur, kv_idxs);
const uint64_t size_virt = ggml_row_size(k->type, hparams.n_embd_k_gqa(il)*get_size());
ggml_tensor * k_view = ggml_view_3d(ctx, k, k->ne[0], k->ne[1], ns,
ggml_row_size(k->type, k->ne[0]),
size_virt,
size_virt*sinfo.s0);
k_cur = ggml_reshape_3d(ctx, k_cur, k_cur->ne[0], k_cur->ne[1]/ns, ns);
kv_idxs = ggml_reshape_2d(ctx, kv_idxs, n_tokens/ns, ns);
return ggml_set_rows(ctx, k_view, k_cur, kv_idxs);
}
// TODO: fallback to old ggml_cpy() method for backwards compatibility
@@ -995,27 +1000,46 @@ ggml_tensor * llama_kv_cache_unified::cpy_v(ggml_context * ctx, ggml_tensor * v_
v_cur = ggml_reshape_2d(ctx, v_cur, n_embd_v_gqa, n_tokens);
if (kv_idxs && supports_set_rows) {
if (!v_trans) {
v = ggml_reshape_2d(ctx, v, v->ne[0], v->ne[1]*v->ne[2]);
const uint32_t ns = sinfo.s1 - sinfo.s0 + 1;
return ggml_set_rows(ctx, v, v_cur, kv_idxs);
const uint64_t size_virt = ggml_row_size(v->type, hparams.n_embd_v_gqa(il)*get_size());
if (!v_trans) {
ggml_tensor * v_view = ggml_view_3d(ctx, v, v->ne[0], v->ne[1], ns,
ggml_row_size(v->type, v->ne[0]),
size_virt,
size_virt*sinfo.s0);
v_cur = ggml_reshape_3d(ctx, v_cur, v_cur->ne[0], v_cur->ne[1]/ns, ns);
kv_idxs = ggml_reshape_2d(ctx, kv_idxs, n_tokens/ns, ns);
return ggml_set_rows(ctx, v_view, v_cur, kv_idxs);
}
// the row becomes a single element
ggml_tensor * v_view = ggml_reshape_3d(ctx, v, 1, v->ne[1]*v->ne[2], v->ne[0]);
ggml_tensor * v_view = ggml_view_4d(ctx, v, 1, v->ne[1], v->ne[0], ns,
ggml_row_size(v->type, 1),
ggml_row_size(v->type, v->ne[1]),
size_virt,
size_virt*sinfo.s0);
// note: the V cache is transposed when not using flash attention
v_cur = ggml_permute(ctx, ggml_reshape_3d(ctx, v_cur, v_cur->ne[0], 1, v_cur->ne[1]), 2, 0, 1, 3);
v_cur = ggml_permute(ctx, ggml_reshape_4d(ctx, v_cur, v_cur->ne[0], 1, v_cur->ne[1]/ns, ns), 2, 0, 1, 3);
// note: we can be more explicit here at the cost of extra cont
// however, above we take advantage that a row of single element is always contiguous regardless of the row stride
//v_cur = ggml_reshape_3d(ctx, v_cur, n_embd_v_gqa, v_cur->ne[1]/ns, ns);
//v_cur = ggml_transpose(ctx, v_cur);
//v_cur = ggml_cont_3d(ctx, v_cur, 1, v_cur->ne[0], v_cur->ne[1]);
//v_cur = ggml_cont_4d(ctx, v_cur, 1, v_cur->ne[0], v_cur->ne[1], v_cur->ne[2]);
// we broadcast the KV indices n_embd_v_gqa times
// v [1, n_kv, n_embd_v_gqa]
// v_cur [1, n_tokens, n_embd_v_gqa]
// kv_idxs [n_tokens, 1, 1]
// v [1, n_kv, n_embd_v_gqa, ns]
// v_cur [1, n_tokens/ns, n_embd_v_gqa, ns]
// kv_idxs [n_tokens/ns, 1, ns]
kv_idxs = ggml_reshape_3d(ctx, kv_idxs, n_tokens/ns, 1, ns);
return ggml_set_rows(ctx, v_view, v_cur, kv_idxs);
}
@@ -1053,10 +1077,8 @@ void llama_kv_cache_unified::set_input_kv_idxs(ggml_tensor * dst, const llama_ub
int64_t * data = (int64_t *) dst->data;
for (uint32_t s = 0; s < sinfo.n_seq_virt(); ++s) {
const int64_t offs = sinfo.seq_id_virt[s]*get_size();
for (uint32_t i = 0; i < sinfo.size(); ++i) {
data[s*sinfo.size() + i] = offs + sinfo.idxs[s][i];
data[s*sinfo.size() + i] = sinfo.idxs[s][i];
}
}
}