vbatts/llama.cpp
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Update comments, more proper application

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I see that numbers can go negative so a fix from a referenced commit
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beiller 2023-03-11 21:51:03 -05:00 • committed by GitHub
parent c90e78edc3
commit 340bff0f0e
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1 changed files with 9 additions and 1 deletions
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10
utils.cpp
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@ -391,8 +391,16 @@ gpt_vocab::id llama_sample_top_p(
{
const double scale = 1.0/temp;
for (int i = 0; i < n_logits; ++i) {
// repetition penalty from CTRL paper (https://arxiv.org/abs/1909.05858)
// credit https://github.com/facebookresearch/llama/compare/main...shawwn:llama:main
if ( std::find(last_n_tokens.begin(), last_n_tokens.end(), i) != last_n_tokens.end() ) {
logits_id.push_back(std::make_pair(logits[i]*scale*(1/repeat_penalty), i));
// if score < 0 then repetition penalty has to multiplied to reduce the previous token probability
if(logits[i] < 0.0) {
logits_id.push_back(std::make_pair(logits[i]*scale*repeat_penalty, i));
} else {
logits_id.push_back(std::make_pair(logits[i]*scale/repeat_penalty, i));
}
} else {
logits_id.push_back(std::make_pair(logits[i]*scale, i));
}