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speculative : add heuristic algorithm (#3006)

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* Add heuristic algo for speculative

* Constrain minimum n_draft to 2

* speculative : improve heuristic impl

* speculative : be more rewarding upon guessing max drafted tokens

* speculative : fix typos

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Leng Yue 2023-09-14 09:14:44 -07:00 committed by GitHub
parent 71ca2fad7d
commit 35f73049af
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1 changed files with 23 additions and 1 deletions
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examples/speculative/speculative.cpp
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@ -82,7 +82,7 @@ int main(int argc, char ** argv) {
//GGML_ASSERT(n_vocab == llama_n_vocab(ctx_dft));
// how many tokens to draft each time
const int n_draft = params.n_draft;
int n_draft = params.n_draft;
int n_predict = 0;
int n_drafted = 0;
@ -131,6 +131,7 @@ int main(int argc, char ** argv) {
LOG("drafted: %s\n", LOG_TOKENS_TOSTR_PRETTY(ctx_dft, drafted));
int i_dft = 0;
while (true) {
// sample from the target model
const llama_token id = llama_sample_token(ctx_tgt, NULL, grammar_tgt, params, last_tokens, candidates, i_dft);
@ -174,6 +175,27 @@ int main(int argc, char ** argv) {
llama_eval(ctx_dft, &id, 1, n_past_dft, params.n_threads);
++n_past_dft;
// heuristic for n_draft
{
const int n_draft_cur = (int) drafted.size();
const bool all_accepted = i_dft == n_draft_cur;
LOG("n_draft = %d\n", n_draft);
LOG("n_draft_cur = %d\n", n_draft_cur);
LOG("i_dft = %d\n", i_dft);
LOG("all_accepted = %d\n", all_accepted);
if (all_accepted && n_draft == n_draft_cur) {
LOG(" - max drafted tokens accepted - n_draft += 8\n");
n_draft = std::min(30, n_draft + 8);
} else if (all_accepted) {
LOG(" - partially drafted tokens accepted - no change\n");
} else {
LOG(" - drafted token rejected - n_draft -= 1\n");
n_draft = std::max(2, n_draft - 1);
}
}
drafted.clear();
drafted.push_back(id);