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speculative : bug fixes

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Georgi Gerganov 2023-10-18 18:49:40 +03:00
parent 0e89203b51
commit 4e82b2ea3f
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1 changed files with 10 additions and 17 deletions
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examples/speculative/speculative.cpp
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@ -37,8 +37,8 @@ int main(int argc, char ** argv) {
const int n_seq_dft = params.n_parallel; const int n_seq_dft = params.n_parallel;
// TODO: make this configurable // TODO: make this configurable
const float p_accept = 0.4f; const float p_accept = 0.80f;
const float p_split = 0.3f; const float p_split = 0.10f;
#ifndef LOG_DISABLE_LOGS #ifndef LOG_DISABLE_LOGS
log_set_target(log_filename_generator("speculative", "log")); log_set_target(log_filename_generator("speculative", "log"));
@ -118,7 +118,7 @@ int main(int argc, char ** argv) {
std::vector<seq_draft> drafts(n_seq_dft); std::vector<seq_draft> drafts(n_seq_dft);
params.grammar.clear(); // the draft samplers will copy the target sampler's grammar params.grammar.clear(); // the draft samplers will copy the target sampler's grammar
params.sampling_params.temp = 1.0f; // the draft samplers use default temperature params.sampling_params.temp = std::max(0.01f, params.sampling_params.temp);
for (int s = 0; s < n_seq_dft; ++s) { for (int s = 0; s < n_seq_dft; ++s) {
drafts[s].ctx_sampling = llama_sampling_init(params); drafts[s].ctx_sampling = llama_sampling_init(params);
@ -156,7 +156,7 @@ int main(int argc, char ** argv) {
llama_sampling_accept(ctx_sampling, ctx_tgt, id); llama_sampling_accept(ctx_sampling, ctx_tgt, id);
//LOG("last: %s\n", LOG_TOKENS_TOSTR_PRETTY(ctx_tgt, last_tokens)); //LOG("last: %s\n", LOG_TOKENS_TOSTR_PRETTY(ctx_tgt, ctx_sampling->prev).c_str());
const std::string token_str = llama_token_to_piece(ctx_tgt, id); const std::string token_str = llama_token_to_piece(ctx_tgt, id);
@ -202,7 +202,7 @@ int main(int argc, char ** argv) {
// TODO: simplify // TODO: simplify
{ {
LOG("keeping sequence %d\n", s_keep); LOG("keeping sequence %d, n_past_tgt = %d, n_past_dft = %d\n", s_keep, n_past_tgt, n_past_dft);
llama_kv_cache_seq_keep(ctx_dft, s_keep); llama_kv_cache_seq_keep(ctx_dft, s_keep);
llama_kv_cache_seq_cp (ctx_dft, s_keep, 0, -1, -1); llama_kv_cache_seq_cp (ctx_dft, s_keep, 0, -1, -1);
@ -277,7 +277,7 @@ int main(int argc, char ** argv) {
} }
if (cur_p[0].p < p_accept) { if (cur_p[0].p < p_accept) {
LOG("stopping drafting for seq %3d, probability too low: %.3f < 2*%.3f\n", s, cur_p[0].p, cur_p[1].p); LOG("stopping drafting for seq %3d, probability too low: %.3f < %.3f\n", s, cur_p[0].p, p_accept);
drafts[s].drafting = false; drafts[s].drafting = false;
continue; continue;
} }
@ -337,16 +337,14 @@ int main(int argc, char ** argv) {
llama_batch_add(batch_tgt, id, n_past_tgt + i + 1, { s }, true); llama_batch_add(batch_tgt, id, n_past_tgt + i + 1, { s }, true);
// no need to evaluate the last drafted token, since we won't use the result
if (batch_tgt.n_tokens > n_draft) {
drafts[s].drafting = false;
continue;
}
// add the token to the batch for batched decoding with the draft model // add the token to the batch for batched decoding with the draft model
drafts[s].i_batch_dft = batch_dft.n_tokens; drafts[s].i_batch_dft = batch_dft.n_tokens;
llama_batch_add(batch_dft, id, n_past_cur, { s }, true); llama_batch_add(batch_dft, id, n_past_cur, { s }, true);
if (batch_tgt.n_tokens > n_draft) {
drafts[s].drafting = false;
}
} }
} }
@ -365,11 +363,6 @@ int main(int argc, char ** argv) {
} }
} }
// account for the last drafted token that we didn't evaluate
if (batch_tgt.n_tokens > n_draft) {
++n_drafted;
}
// evaluate the target model on the drafted tokens // evaluate the target model on the drafted tokens
{ {
llama_kv_cache_seq_keep(ctx_tgt, 0); llama_kv_cache_seq_keep(ctx_tgt, 0);