haraldwolff/llama.cpp
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Some improvements to loading the session with --prompt-cache (#1550)

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Improvements to loading the session with `--prompt-cache` in the `main` example.

1. Fix an issue where the `--seed` parameter was ignored when loading a cached prompt.
2. When loading a cached prompt, you previously had to specify the saved prompt (or a prefix of it) again. This pull changes that behavior to default to the prompt that was cached if a prompt wasn't specified by the user.
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Kerfuffle 2023-05-25 20:18:01 -06:00 committed by GitHub
parent 1fcdcc28b1
commit 66874d4fbc
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2 changed files with 15 additions and 5 deletions
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2
examples/main/README.md
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@ -272,7 +272,7 @@ These options help improve the performance and memory usage of the LLaMA models.
### Prompt Caching
- `--prompt-cache FNAME`: Specify a file to cache the model state after the initial prompt. This can significantly speed up the startup time when you're using longer prompts. The file is created during the first run and is reused and updated in subsequent runs.
- `--prompt-cache FNAME`: Specify a file to cache the model state after the initial prompt. This can significantly speed up the startup time when you're using longer prompts. The file is created during the first run and is reused and updated in subsequent runs. **Note**: Restoring a cached prompt does not imply restoring the exact state of the session at the point it was saved. So even when specifying a specific seed, you are not guaranteed to get the same sequence of tokens as the original generation.
### Quantization

18
examples/main/main.cpp
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@ -134,8 +134,6 @@ int main(int argc, char ** argv) {
return 0;
}
// Add a space in front of the first character to match OG llama tokenizer behavior
params.prompt.insert(0, 1, ' ');
std::string path_session = params.path_prompt_cache;
std::vector<llama_token> session_tokens;
@ -155,6 +153,7 @@ int main(int argc, char ** argv) {
return 1;
}
session_tokens.resize(n_token_count_out);
llama_set_rng_seed(ctx, params.seed);
fprintf(stderr, "%s: loaded a session with prompt size of %d tokens\n", __func__, (int) session_tokens.size());
} else {
@ -163,7 +162,16 @@ int main(int argc, char ** argv) {
}
// tokenize the prompt
auto embd_inp = ::llama_tokenize(ctx, params.prompt, true);
std::vector<llama_token> embd_inp;
if (params.interactive_first || params.instruct || !params.prompt.empty() || session_tokens.empty()) {
// Add a space in front of the first character to match OG llama tokenizer behavior
params.prompt.insert(0, 1, ' ');
embd_inp = ::llama_tokenize(ctx, params.prompt, true);
} else {
embd_inp = session_tokens;
}
const int n_ctx = llama_n_ctx(ctx);
@ -181,7 +189,9 @@ int main(int argc, char ** argv) {
}
n_matching_session_tokens++;
}
if (n_matching_session_tokens >= embd_inp.size()) {
if (params.prompt.empty() && n_matching_session_tokens == embd_inp.size()) {
fprintf(stderr, "%s: using full prompt from session file\n", __func__);
} else if (n_matching_session_tokens >= embd_inp.size()) {
fprintf(stderr, "%s: session file has exact match for prompt!\n", __func__);
} else if (n_matching_session_tokens < (embd_inp.size() / 2)) {
fprintf(stderr, "%s: warning: session file has low similarity to prompt (%zu / %zu tokens); will mostly be reevaluated\n",