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model : add tokenizer from LFM2.5-Audio-1.5B (#19687)

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* model : Add tokenizer from LFM2.5-Audio-1.5B

[LFM2.5-Audio-1.5B](https://huggingface.co/LiquidAI/LFM2.5-Audio-1.5B) introduced lightweight audio tokenizer.

Tokenizer based on LFM2 architecture and acts as "embedding" model with
different input `n_embd` and output `n_embd_out`.

To be used in https://github.com/ggml-org/llama.cpp/pull/18641.

To convert use

```shell
python3 convert_hf_to_gguf.py /path/to/LFM2.5-Audio-1.5B/audio_detokenizer
```

* Update convert_hf_to_gguf.py

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* Formatting

* Rework check for attention layers

* Add LFM2 SWA model support

* Address PR feedback

* Set vocab to none

* Move helper function definitions to cpp file

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
This commit is contained in:
Tarek Dakhran
2026-02-19 09:54:48 +01:00
committed by GitHub
parent eacb4b67a2
commit 8004f3a8d1
7 changed files with 185 additions and 137 deletions
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src/models/lfm2.cpp
+138 -123
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@@ -1,18 +1,149 @@
#include "models.h"
#include "../llama-memory-hybrid-iswa.h"
#include "../llama-memory-hybrid.h"
template <bool iswa>
llm_build_lfm2<iswa>::llm_build_lfm2(const llama_model & model, const llm_graph_params & params) :
llm_graph_context(params) {
using inp_hybrid_type = std::conditional_t<iswa, llm_graph_input_mem_hybrid_iswa, llm_graph_input_mem_hybrid>;
using inp_attn_type = std::conditional_t<iswa, llm_graph_input_attn_kv_iswa, llm_graph_input_attn_kv>;
using mem_hybrid_ctx = std::conditional_t<iswa, llama_memory_hybrid_iswa_context, llama_memory_hybrid_context>;
llm_build_lfm2::llm_build_lfm2(const llama_model & model, const llm_graph_params & params) :
llm_graph_context(params),
model(model) {
// lambda helpers for readability
auto build_dense_feed_forward = [&model, this](ggml_tensor * cur, int il) -> ggml_tensor * {
GGML_ASSERT(!model.layers[il].ffn_up_b);
GGML_ASSERT(!model.layers[il].ffn_gate_b);
GGML_ASSERT(!model.layers[il].ffn_down_b);
return build_ffn(cur,
model.layers[il].ffn_up, NULL, NULL,
model.layers[il].ffn_gate, NULL, NULL,
model.layers[il].ffn_down, NULL, NULL,
NULL, LLM_FFN_SILU, LLM_FFN_PAR, il);
};
auto build_moe_feed_forward = [&model, this](ggml_tensor * cur, int il) -> ggml_tensor * {
return build_moe_ffn(cur,
model.layers[il].ffn_gate_inp, model.layers[il].ffn_up_exps,
model.layers[il].ffn_gate_exps, model.layers[il].ffn_down_exps,
model.layers[il].ffn_exp_probs_b, n_expert, n_expert_used, LLM_FFN_SILU, true, false, 0.0,
static_cast<llama_expert_gating_func_type>(hparams.expert_gating_func), il);
};
auto build_attn_block = [&model, this](ggml_tensor * cur,
ggml_tensor * inp_pos,
inp_attn_type * inp_attn,
int il) -> ggml_tensor * {
GGML_ASSERT(hparams.n_embd_v_gqa(il) == hparams.n_embd_k_gqa(il));
const auto n_embd_head = hparams.n_embd_head_v;
const auto n_head_kv = hparams.n_head_kv(il);
auto * q = build_lora_mm(model.layers[il].wq, cur);
cb(q, "model.layers.{}.self_attn.q_proj", il);
auto * k = build_lora_mm(model.layers[il].wk, cur);
cb(k, "model.layers.{}.self_attn.k_proj", il);
auto * v = build_lora_mm(model.layers[il].wv, cur);
cb(v, "model.layers.{}.self_attn.v_proj", il);
q = ggml_reshape_3d(ctx0, q, n_embd_head, n_head, n_tokens);
k = ggml_reshape_3d(ctx0, k, n_embd_head, n_head_kv, n_tokens);
v = ggml_reshape_3d(ctx0, v, n_embd_head, n_head_kv, n_tokens);
// qk norm
q = build_norm(q, model.layers[il].attn_q_norm, NULL, LLM_NORM_RMS, il);
cb(q, "model.layers.{}.self_attn.q_layernorm", il);
k = build_norm(k, model.layers[il].attn_k_norm, NULL, LLM_NORM_RMS, il);
cb(k, "model.layers.{}.self_attn.k_layernorm", il);
// RoPE
q = ggml_rope_ext(ctx0, q, inp_pos, nullptr, n_rot, rope_type, n_ctx_orig, freq_base, freq_scale, ext_factor,
attn_factor, beta_fast, beta_slow);
k = ggml_rope_ext(ctx0, k, inp_pos, nullptr, n_rot, rope_type, n_ctx_orig, freq_base, freq_scale, ext_factor,
attn_factor, beta_fast, beta_slow);
cur = build_attn(inp_attn,
model.layers[il].wo, NULL,
q, k, v, nullptr, nullptr, nullptr, 1.0f / sqrtf(float(n_embd_head)), il);
cb(cur, "model.layers.{}.self_attn.out_proj", il);
return cur;
};
auto build_shortconv_block = [&model, this](ggml_tensor * cur,
llm_graph_input_rs * inp_recr,
int il) -> ggml_tensor * {
const auto * mctx_cur = static_cast<const mem_hybrid_ctx *>(mctx)->get_recr();
const uint32_t kv_head = mctx_cur->get_head();
const int64_t n_seq_tokens = ubatch.n_seq_tokens;
const int64_t n_seqs = ubatch.n_seqs;
GGML_ASSERT(n_seqs != 0);
GGML_ASSERT(ubatch.equal_seqs());
GGML_ASSERT(ubatch.n_tokens == n_seq_tokens * n_seqs);
GGML_ASSERT(hparams.n_shortconv_l_cache > 1);
const uint32_t d_conv = hparams.n_shortconv_l_cache - 1;
// {n_embd, n_tokens} => {n_embd, n_seq_tokens, n_seqs}
cur = ggml_reshape_3d(ctx0, cur, cur->ne[0], n_seq_tokens, n_seqs);
auto * bcx = build_lora_mm(model.layers[il].shortconv.in_proj, cur);
cb(bcx, "model.layers.{}.conv.in_proj", il);
constexpr auto n_chunks = 3;
GGML_ASSERT(bcx->ne[0] % n_chunks == 0);
const auto chunk_size = bcx->ne[0] / n_chunks;
auto * b = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
0 * chunk_size * ggml_element_size(bcx));
auto * c = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
1 * chunk_size * ggml_element_size(bcx));
auto * x = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
2 * chunk_size * ggml_element_size(bcx));
auto * bx = ggml_transpose(ctx0, ggml_mul(ctx0, b, x));
// read conv state
auto * conv_state = mctx_cur->get_r_l(il);
auto * conv_rs = build_rs(inp_recr, conv_state, hparams.n_embd_r(), n_seqs);
auto * conv = ggml_reshape_3d(ctx0, conv_rs, d_conv, hparams.n_embd, n_seqs);
bx = ggml_concat(ctx0, conv, bx, 0);
GGML_ASSERT(bx->ne[0] > conv->ne[0]);
// last d_conv columns is a new conv state
auto * new_conv = ggml_view_3d(ctx0, bx, conv->ne[0], bx->ne[1], bx->ne[2], bx->nb[1], bx->nb[2],
(bx->ne[0] - conv->ne[0]) * ggml_element_size(bx));
GGML_ASSERT(ggml_are_same_shape(conv, new_conv));
// write new conv conv state
ggml_build_forward_expand(gf, ggml_cpy(ctx0, new_conv,
ggml_view_1d(ctx0, conv_state, ggml_nelements(new_conv),
kv_head * d_conv * n_embd * ggml_element_size(new_conv))));
auto * conv_kernel = model.layers[il].shortconv.conv;
auto * conv_out = ggml_ssm_conv(ctx0, bx, conv_kernel);
cb(conv_out, "model.layers.{}.conv.conv", il);
auto * y = ggml_mul(ctx0, c, conv_out);
y = build_lora_mm(model.layers[il].shortconv.out_proj, y);
cb(y, "model.layers.{}.conv.out_proj", il);
// {n_embd, n_seq_tokens, n_seqs} => {n_embd, n_tokens}
y = ggml_reshape_2d(ctx0, y, y->ne[0], n_seq_tokens * n_seqs);
return y;
};
// actual graph construction starts here
ggml_tensor * cur = build_inp_embd(model.tok_embd);
cb(cur, "model.embed_tokens", -1);
ggml_build_forward_expand(gf, cur);
inp_hybrid_type * inp_hybrid = nullptr;
if constexpr (iswa) {
inp_hybrid = build_inp_mem_hybrid_iswa();
} else {
inp_hybrid = build_inp_mem_hybrid();
}
ggml_tensor * inp_pos = build_inp_pos();
auto * inp_hybrid = build_inp_mem_hybrid();
ggml_tensor * inp_out_ids = build_inp_out_ids();
for (int il = 0; il < n_layer; ++il) {
@@ -54,122 +185,6 @@ llm_build_lfm2::llm_build_lfm2(const llama_model & model, const llm_graph_params
ggml_build_forward_expand(gf, cur);
}
ggml_tensor * llm_build_lfm2::build_moe_feed_forward(ggml_tensor * cur, int il) const {
return build_moe_ffn(cur,
model.layers[il].ffn_gate_inp, model.layers[il].ffn_up_exps,
model.layers[il].ffn_gate_exps, model.layers[il].ffn_down_exps,
model.layers[il].ffn_exp_probs_b, n_expert, n_expert_used, LLM_FFN_SILU, true, false, 0.0,
static_cast<llama_expert_gating_func_type>(hparams.expert_gating_func), il);
}
ggml_tensor * llm_build_lfm2::build_dense_feed_forward(ggml_tensor * cur, int il) const {
GGML_ASSERT(!model.layers[il].ffn_up_b);
GGML_ASSERT(!model.layers[il].ffn_gate_b);
GGML_ASSERT(!model.layers[il].ffn_down_b);
return build_ffn(cur,
model.layers[il].ffn_up, NULL, NULL,
model.layers[il].ffn_gate, NULL, NULL,
model.layers[il].ffn_down, NULL, NULL,
NULL, LLM_FFN_SILU, LLM_FFN_PAR, il);
}
ggml_tensor * llm_build_lfm2::build_attn_block(ggml_tensor * cur,
ggml_tensor * inp_pos,
llm_graph_input_attn_kv * inp_attn,
int il) const {
GGML_ASSERT(hparams.n_embd_v_gqa(il) == hparams.n_embd_k_gqa(il));
const auto n_embd_head = hparams.n_embd_head_v;
const auto n_head_kv = hparams.n_head_kv(il);
auto * q = build_lora_mm(model.layers[il].wq, cur);
cb(q, "model.layers.{}.self_attn.q_proj", il);
auto * k = build_lora_mm(model.layers[il].wk, cur);
cb(k, "model.layers.{}.self_attn.k_proj", il);
auto * v = build_lora_mm(model.layers[il].wv, cur);
cb(v, "model.layers.{}.self_attn.v_proj", il);
q = ggml_reshape_3d(ctx0, q, n_embd_head, n_head, n_tokens);
k = ggml_reshape_3d(ctx0, k, n_embd_head, n_head_kv, n_tokens);
v = ggml_reshape_3d(ctx0, v, n_embd_head, n_head_kv, n_tokens);
// qk norm
q = build_norm(q, model.layers[il].attn_q_norm, NULL, LLM_NORM_RMS, il);
cb(q, "model.layers.{}.self_attn.q_layernorm", il);
k = build_norm(k, model.layers[il].attn_k_norm, NULL, LLM_NORM_RMS, il);
cb(k, "model.layers.{}.self_attn.k_layernorm", il);
// RoPE
q = ggml_rope_ext(ctx0, q, inp_pos, nullptr, n_rot, rope_type, n_ctx_orig, freq_base, freq_scale, ext_factor,
attn_factor, beta_fast, beta_slow);
k = ggml_rope_ext(ctx0, k, inp_pos, nullptr, n_rot, rope_type, n_ctx_orig, freq_base, freq_scale, ext_factor,
attn_factor, beta_fast, beta_slow);
cur = build_attn(inp_attn,
model.layers[il].wo, NULL,
q, k, v, nullptr, nullptr, nullptr, 1.0f / sqrtf(float(n_embd_head)), il);
cb(cur, "model.layers.{}.self_attn.out_proj", il);
return cur;
}
ggml_tensor * llm_build_lfm2::build_shortconv_block(ggml_tensor * cur, llm_graph_input_rs * inp_recr, int il) {
const auto * mctx_cur = static_cast<const llama_memory_hybrid_context *>(mctx)->get_recr();
const uint32_t kv_head = mctx_cur->get_head();
const int64_t n_seq_tokens = ubatch.n_seq_tokens;
const int64_t n_seqs = ubatch.n_seqs;
GGML_ASSERT(n_seqs != 0);
GGML_ASSERT(ubatch.equal_seqs());
GGML_ASSERT(ubatch.n_tokens == n_seq_tokens * n_seqs);
GGML_ASSERT(hparams.n_shortconv_l_cache > 1);
const uint32_t d_conv = hparams.n_shortconv_l_cache - 1;
// {n_embd, n_tokens} => {n_embd, n_seq_tokens, n_seqs}
cur = ggml_reshape_3d(ctx0, cur, cur->ne[0], n_seq_tokens, n_seqs);
auto * bcx = build_lora_mm(model.layers[il].shortconv.in_proj, cur);
cb(bcx, "model.layers.{}.conv.in_proj", il);
constexpr auto n_chunks = 3;
GGML_ASSERT(bcx->ne[0] % n_chunks == 0);
const auto chunk_size = bcx->ne[0] / n_chunks;
auto * b = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
0 * chunk_size * ggml_element_size(bcx));
auto * c = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
1 * chunk_size * ggml_element_size(bcx));
auto * x = ggml_view_3d(ctx0, bcx, chunk_size, bcx->ne[1], bcx->ne[2], bcx->nb[1], bcx->nb[2],
2 * chunk_size * ggml_element_size(bcx));
auto * bx = ggml_transpose(ctx0, ggml_mul(ctx0, b, x));
// read conv state
auto * conv_state = mctx_cur->get_r_l(il);
auto * conv_rs = build_rs(inp_recr, conv_state, hparams.n_embd_r(), n_seqs);
auto * conv = ggml_reshape_3d(ctx0, conv_rs, d_conv, hparams.n_embd, n_seqs);
bx = ggml_concat(ctx0, conv, bx, 0);
GGML_ASSERT(bx->ne[0] > conv->ne[0]);
// last d_conv columns is a new conv state
auto * new_conv = ggml_view_3d(ctx0, bx, conv->ne[0], bx->ne[1], bx->ne[2], bx->nb[1], bx->nb[2],
(bx->ne[0] - conv->ne[0]) * ggml_element_size(bx));
GGML_ASSERT(ggml_are_same_shape(conv, new_conv));
// write new conv conv state
ggml_build_forward_expand(gf, ggml_cpy(ctx0, new_conv,
ggml_view_1d(ctx0, conv_state, ggml_nelements(new_conv),
kv_head * d_conv * n_embd * ggml_element_size(new_conv))));
auto * conv_kernel = model.layers[il].shortconv.conv;
auto * conv_out = ggml_ssm_conv(ctx0, bx, conv_kernel);
cb(conv_out, "model.layers.{}.conv.conv", il);
auto * y = ggml_mul(ctx0, c, conv_out);
y = build_lora_mm(model.layers[il].shortconv.out_proj, y);
cb(y, "model.layers.{}.conv.out_proj", il);
// {n_embd, n_seq_tokens, n_seqs} => {n_embd, n_tokens}
y = ggml_reshape_2d(ctx0, y, y->ne[0], n_seq_tokens * n_seqs);
return y;
}
// Explicit template instantiations
template struct llm_build_lfm2<true>;
template struct llm_build_lfm2<false>;
src/models/models.h
+1 -7
View File
@@ -347,15 +347,9 @@ struct llm_build_kimi_linear : public llm_build_delta_net_base {
const llama_model & model;
};
template <bool iswa>
struct llm_build_lfm2 : public llm_graph_context {
const llama_model & model;
llm_build_lfm2(const llama_model & model, const llm_graph_params & params);
ggml_tensor * build_moe_feed_forward(ggml_tensor * cur, int il) const;
ggml_tensor * build_dense_feed_forward(ggml_tensor * cur, int il) const;
ggml_tensor * build_attn_block(ggml_tensor * cur, ggml_tensor * inp_pos, llm_graph_input_attn_kv * inp_attn, int il) const;
ggml_tensor * build_shortconv_block(ggml_tensor * cur, llm_graph_input_rs * inp_recr, int il);
};
struct llm_build_llada : public llm_graph_context {