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fix perplexity after c-api refactor (#390) 

* preallocate a buffer of fitting size for tokenization (utils.cpp)

* don't create a new std::string (especially here, where it's usually large)
This commit is contained in:
Erik Scholz 2023-03-22 17:09:38 +01:00 committed by GitHub
parent 40ea807a97
commit 56e659a0b2
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2 changed files with 4 additions and 2 deletions
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2
main.cpp
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@ -85,7 +85,7 @@ void perplexity(llama_context * ctx, const gpt_params & params) {
// Download: https://s3.amazonaws.com/research.metamind.io/wikitext/wikitext-2-raw-v1.zip?ref=salesforce-research
// Run `./main --perplexity -m models/7B/ggml-model-q4_0.bin -f wiki.test.raw`
// Output: `perplexity: 13.5106 [114/114]`
auto tokens = ::llama_tokenize(ctx, params.prompt.c_str(), true);
auto tokens = ::llama_tokenize(ctx, params.prompt, true);
int count = 0;
double nll = 0.0;

4
utils.cpp
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@ -146,8 +146,10 @@ std::string gpt_random_prompt(std::mt19937 & rng) {
// TODO: not great allocating this every time
std::vector<llama_token> llama_tokenize(struct llama_context * ctx, const std::string & text, bool add_bos) {
std::vector<llama_token> res(8096);
// initialize to prompt numer of chars, since n_tokens <= n_prompt_chars
std::vector<llama_token> res(text.size() + (int)add_bos);
int n = llama_tokenize(ctx, text.c_str(), res.data(), res.size(), add_bos);
assert(n >= 0);
res.resize(n);
return res;