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server : fix crash when prompt exceeds context size (#3996)

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Alexey Parfenov 2023-11-11 05:48:21 +00:00 committed by GitHub
parent 34b0a08207
commit d96ca7ded7
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1 changed files with 29 additions and 29 deletions
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58
examples/server/server.cpp
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@ -1557,6 +1557,35 @@ struct llama_server_context
slot.num_prompt_tokens = prompt_tokens.size();
if (slot.params.n_keep < 0)
{
slot.params.n_keep = slot.num_prompt_tokens;
}
slot.params.n_keep = std::min(slot.n_ctx - 4, slot.params.n_keep);
// if input prompt is too big, truncate it
if (slot.num_prompt_tokens >= slot.n_ctx)
{
const int n_left = slot.n_ctx - slot.params.n_keep;
const int n_block_size = n_left / 2;
const int erased_blocks = (slot.num_prompt_tokens - slot.params.n_keep - n_block_size) / n_block_size;
std::vector<llama_token> new_tokens(prompt_tokens.begin(), prompt_tokens.begin() + slot.params.n_keep);
new_tokens.insert(new_tokens.end(), prompt_tokens.begin() + slot.params.n_keep + erased_blocks * n_block_size, prompt_tokens.end());
LOG_VERBOSE("input truncated", {
{"n_ctx", slot.n_ctx},
{"n_keep", slot.params.n_keep},
{"n_left", n_left},
{"new_tokens", tokens_to_str(ctx, new_tokens.cbegin(), new_tokens.cend())},
});
slot.truncated = true;
prompt_tokens = new_tokens;
slot.num_prompt_tokens = prompt_tokens.size();
GGML_ASSERT(slot.num_prompt_tokens < slot.n_ctx);
}
if (!slot.params.cache_prompt)
{
llama_sampling_reset(slot.ctx_sampling);
@ -1566,35 +1595,6 @@ struct llama_server_context
}
else
{
if (slot.params.n_keep < 0)
{
slot.params.n_keep = slot.num_prompt_tokens;
}
slot.params.n_keep = std::min(slot.n_ctx - 4, slot.params.n_keep);
// if input prompt is too big, truncate it
if (slot.num_prompt_tokens >= slot.n_ctx)
{
const int n_left = slot.n_ctx - slot.params.n_keep;
const int n_block_size = n_left / 2;
const int erased_blocks = (slot.num_prompt_tokens - slot.params.n_keep - n_block_size) / n_block_size;
std::vector<llama_token> new_tokens(prompt_tokens.begin(), prompt_tokens.begin() + slot.params.n_keep);
new_tokens.insert(new_tokens.end(), prompt_tokens.begin() + slot.params.n_keep + erased_blocks * n_block_size, prompt_tokens.end());
LOG_VERBOSE("input truncated", {
{"n_ctx", slot.n_ctx},
{"n_keep", slot.params.n_keep},
{"n_left", n_left},
{"new_tokens", tokens_to_str(ctx, new_tokens.cbegin(), new_tokens.cend())},
});
slot.truncated = true;
prompt_tokens = new_tokens;
slot.num_prompt_tokens = prompt_tokens.size();
GGML_ASSERT(slot.num_prompt_tokens < slot.n_ctx);
}
// push the prompt into the sampling context (do not apply grammar)
for (auto &token : prompt_tokens)
{