vbatts/llama.cpp
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fixed various issues with sampler pointed out by original creator

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This commit is contained in:
l3utterfly 2024-04-29 10:01:50 +09:00
parent 4d603e3520
commit 75beda2a84
3 changed files with 36 additions and 30 deletions
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4
common/sampling.cpp
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@ -277,7 +277,7 @@ static llama_token_data_array llama_sampling_prepare_impl(
// DRY sampler parameters
const float dry_multiplier = params.dry_multiplier;
const float dry_base = params.dry_base;
const int dry_allowed_length = params.dry_allowed_length;
const uint32_t dry_allowed_length = params.dry_allowed_length;
auto & prev = ctx_sampling->prev;
auto & cur = ctx_sampling->cur;
@ -324,7 +324,7 @@ static llama_token_data_array llama_sampling_prepare_impl(
llama_sample_dry(ctx_main, &cur_p,
penalty_tokens.data() + penalty_tokens.size() - penalty_tokens_used_size,
penalty_tokens_used_size, dry_base, dry_multiplier, dry_allowed_length,
params.dry_sequence_breakers.data(), params.dry_sequence_breakers.size());
params.dry_seq_breakers.data(), params.dry_seq_breakers.size());
}
if (!penalize_nl) {

4
common/sampling.h
View file

@ -43,7 +43,7 @@ typedef struct llama_sampling_params {
uint32_t seed = LLAMA_DEFAULT_SEED; // the seed used to initialize llama_sampling_context
float dry_multiplier = 0.0f; // 0.0f = disabled, recommended value: 0.8f
float dry_base = 1.75f;
int dry_allowed_length = 2;
uint32_t dry_allowed_length = 2;
std::vector<llama_sampler_type> samplers_sequence = {
llama_sampler_type::TOP_K,
@ -64,7 +64,7 @@ typedef struct llama_sampling_params {
std::unordered_map<llama_token, float> logit_bias; // logit bias for specific tokens
std::vector<llama_token> penalty_prompt_tokens;
std::vector<llama_token> dry_sequence_breakers; // sequence breakers for the DRY sampler
std::vector<llama_token> dry_seq_breakers; // sequence breakers for the DRY sampler
bool use_penalty_prompt_tokens = false;
} llama_sampling_params;

36
llama.cpp
View file

@ -13233,15 +13233,15 @@ void llama_sample_min_p(struct llama_context * ctx, llama_token_data_array * can
}
}
void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candidates, const llama_token * last_tokens, int last_tokens_size, float dry_base, float dry_multiplier, int dry_allowed_length, const llama_token * seq_breakers, int seq_breakers_size) {
// sanity check
GGML_ASSERT(last_tokens_size > 0);
void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candidates, const llama_token * last_tokens, int last_tokens_size, float dry_base, float dry_multiplier, int dry_allowed_length, const llama_token * dry_seq_breakers, int dry_seq_breakers_size) {
// skip dry sampler if we don't have a previous token
if (last_tokens_size < 1) return;
// get the last token
auto last_token = last_tokens[last_tokens_size - 1];
// if last token is part of the sequence breakers, skip whole sampler
if(std::find(seq_breakers, seq_breakers + seq_breakers_size, last_token) != seq_breakers + seq_breakers_size) {
if (std::find(dry_seq_breakers, dry_seq_breakers + dry_seq_breakers_size, last_token) != dry_seq_breakers + dry_seq_breakers_size) {
return;
}
@ -13250,7 +13250,7 @@ void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candi
// loop through each previous token (exclude the last token)
for (size_t i = 0; i < last_tokens_size - 1; ++i) {
// skip if the compare token if it's not the same as the last token
// skip if the compare token is not the same as the last token
if (last_tokens[i] != last_token) {
continue;
}
@ -13258,7 +13258,12 @@ void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candi
// get the next token (i + 1 is always less than last_tokens_size)
auto next_token = last_tokens[i + 1];
// try to extend the match backwards (match length starts a 1 because last token is already matched)
// if next token is part of the sequence breakers, skip
if (std::find(dry_seq_breakers, dry_seq_breakers + dry_seq_breakers_size, next_token) != dry_seq_breakers + dry_seq_breakers_size) {
continue;
}
// try to extend the match backwards (match length starts at 1 because last token is already matched)
size_t match_length = 1;
// loop through the previous tokens
@ -13272,15 +13277,17 @@ void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candi
// head token starts at the end of last tokens, going backwards by match length, minus 1 because we start at the last token itself
auto head_token = last_tokens[last_tokens_size - 1 - match_length];
// if compare token is part of the sequence breakers, break out of the match
if(std::find(seq_breakers, seq_breakers + seq_breakers_size, compare_token) != seq_breakers + seq_breakers_size)
break;
// break out of the match if any tokens don't match
if(compare_token != head_token)
if (compare_token != head_token) {
break;
}
// if compare token is part of the sequence breakers, break out of the match
if (std::find(dry_seq_breakers, dry_seq_breakers + dry_seq_breakers_size, compare_token) != dry_seq_breakers + dry_seq_breakers_size) {
break;
}
}
// Check if the next token exists in the map
auto it = match_lengths.find(next_token);
@ -13298,12 +13305,11 @@ void llama_sample_dry(struct llama_context * ctx, llama_token_data_array * candi
auto next_token = pair.first;
auto match_length = pair.second;
// if the match length is greater than our allowed length in config, we apply penalities
if(match_length > dry_allowed_length) {
// if the match length is greater than or equal to our allowed length in config, we apply penalities
if (match_length >= dry_allowed_length) {
// find our next token in the candidates->data
size_t i = 0;
for (; i < candidates->size; ++i) {
for (size_t i = 0; i < candidates->size; ++i) {
if (candidates->data[i].id == next_token) {
// calculate the penalty
float penalty = dry_multiplier * pow(dry_base, match_length - dry_allowed_length);