vbatts/llama.cpp
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speculative : refactor and add a simpler example (#10362)

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* speculative : refactor and add a simpler example

ggml-ci

* speculative : clean-up and add comments and TODOs [no ci]

* speculative : manage context in common_speculative

ggml-ci

* speculative : simplify

ggml-ci

* speculative : simplify (cont)

ggml-ci

* speculative : add --draft-min CLI arg

* speculative : minor fixup

* make : build fixes

* speculative : do not redraft previous drafts

ggml-ci

* speculative : fix the draft sampling

ggml-ci

* speculative : fix compile warning

* common : refactor args

ggml-ci

* common : change defaults [no ci]

* common : final touches

ggml-ci
This commit is contained in:
Georgi Gerganov 2024-11-25 09:58:41 +02:00 • committed by GitHub
parent cce5a90075
commit d9d54e498d
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28 changed files with 1028 additions and 326 deletions
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30
examples/speculative/speculative.cpp
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@ -12,7 +12,7 @@
#include <string>
#include <vector>
#define SPEC_VOCAB_MAX_SIZE_DIFFERENCE 100
#define SPEC_VOCAB_MAX_SIZE_DIFFERENCE 128
#define SPEC_VOCAB_CHECK_START_TOKEN_ID 5
struct seq_draft {
@ -33,7 +33,7 @@ int main(int argc, char ** argv) {
common_params params;
// needed to get candidate probs even for temp <= 0.0
params.sparams.n_probs = 128;
params.sampling.n_probs = 128;
if (!common_params_parse(argc, argv, params, LLAMA_EXAMPLE_SPECULATIVE)) {
return 1;
@ -46,7 +46,7 @@ int main(int argc, char ** argv) {
common_init();
if (params.model_draft.empty()) {
if (params.speculative.model.empty()) {
LOG_ERR("%s: --model-draft is required\n", __func__);
return 1;
}
@ -55,9 +55,9 @@ int main(int argc, char ** argv) {
const int n_seq_dft = params.n_parallel;
// probability threshold for splitting a draft branch (only for n_seq_dft > 1)
const float p_split = params.p_split;
const float p_draft_split = params.speculative.p_split;
std::default_random_engine rng(params.sparams.seed == LLAMA_DEFAULT_SEED ? std::random_device()() : params.sparams.seed);
std::default_random_engine rng(params.sampling.seed == LLAMA_DEFAULT_SEED ? std::random_device()() : params.sampling.seed);
std::uniform_real_distribution<> u_dist;
// init llama.cpp
@ -76,13 +76,13 @@ int main(int argc, char ** argv) {
ctx_tgt = llama_init_tgt.context;
// load the draft model
params.model = params.model_draft;
params.n_gpu_layers = params.n_gpu_layers_draft;
if (params.draft_cpuparams.n_threads > 0) {
params.cpuparams.n_threads = params.draft_cpuparams.n_threads;
params.model = params.speculative.model;
params.n_gpu_layers = params.speculative.n_gpu_layers;
if (params.speculative.cpuparams.n_threads > 0) {
params.cpuparams.n_threads = params.speculative.cpuparams.n_threads;
}
params.cpuparams_batch.n_threads = params.draft_cpuparams_batch.n_threads;
params.cpuparams_batch.n_threads = params.speculative.cpuparams_batch.n_threads;
common_init_result llama_init_dft = common_init_from_params(params);
model_dft = llama_init_dft.model;
ctx_dft = llama_init_dft.context;
@ -170,7 +170,7 @@ int main(int argc, char ** argv) {
//GGML_ASSERT(n_vocab == llama_n_vocab(model_dft));
// how many tokens to draft each time
int n_draft = params.n_draft;
int n_draft = params.speculative.n_max;
int n_predict = 0;
int n_drafted = 0;
@ -183,14 +183,14 @@ int main(int argc, char ** argv) {
bool has_eos = false;
// target model sampling context (reuse the llama_context's sampling instance)
struct common_sampler * smpl = common_sampler_init(model_tgt, params.sparams);
struct common_sampler * smpl = common_sampler_init(model_tgt, params.sampling);
// draft sequence data
std::vector<seq_draft> drafts(n_seq_dft);
for (int s = 0; s < n_seq_dft; ++s) {
// allocate llama_sampler for each draft sequence
drafts[s].smpl = common_sampler_init(model_dft, params.sparams);
drafts[s].smpl = common_sampler_init(model_dft, params.sampling);
}
llama_batch batch_dft = llama_batch_init(llama_n_batch(ctx_dft), 0, 1);
@ -230,7 +230,7 @@ int main(int argc, char ** argv) {
// for stochastic sampling, attempt to match the token with the drafted tokens
{
bool accept = false;
if (params.sparams.temp > 0) {
if (params.sampling.temp > 0) {
// stochastic verification
common_sampler_sample(smpl, ctx_tgt, drafts[s_keep].i_batch_tgt[i_dft], true);
@ -494,7 +494,7 @@ int main(int argc, char ** argv) {
// attempt to split the branch if the probability is high enough
for (int f = 1; f < 8; ++f) {
if (n_seq_cur < n_seq_dft && cur_p->data[f].p > p_split) {
if (n_seq_cur < n_seq_dft && cur_p->data[f].p > p_draft_split) {
LOG_DBG("splitting seq %3d into %3d\n", s, n_seq_cur);
llama_kv_cache_seq_rm(ctx_dft, n_seq_cur, -1, -1);