vbatts/llama.cpp
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fix setting prob for sampled token

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This commit is contained in:
Xuan Son Nguyen 2024-12-19 14:39:36 +01:00
parent a217382b25
commit 5b966df177
1 changed files with 21 additions and 24 deletions
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45
examples/server/server.cpp
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@ -475,14 +475,14 @@ struct completion_token_output {
{"id", p.tok},
{"token", txt},
{"bytes", str_to_bytes(p.text_to_send)},
{
post_sampling_probs ? "top_probs" : "top_logprobs",
p.to_json(post_sampling_probs)
},
{
post_sampling_probs ? "prob" : "logprob",
post_sampling_probs ? p.prob : logarithm(p.prob)
},
{
post_sampling_probs ? "top_probs" : "top_logprobs",
p.to_json(post_sampling_probs)
},
});
}
return out;
@ -1956,52 +1956,49 @@ struct server_context {
void populate_token_probs(const server_slot & slot, completion_token_output & result, bool post_sampling, bool special, int idx) {
size_t n_probs = slot.params.sampling.n_probs;
int n_vocab = llama_n_vocab(llama_get_model(ctx));
size_t n_vocab = llama_n_vocab(llama_get_model(ctx));
if (post_sampling) {
const auto * cur_p = common_sampler_get_candidates(slot.smpl);
const size_t max_probs = cur_p->size;
bool found_sampled_tok = false;
result.probs.reserve(max_probs);
// set probability for sampled token
for (size_t i = 0; i < max_probs; i++) {
// set probability for sampled token
if (cur_p->data[i].id == result.tok) {
found_sampled_tok = true;
result.prob = cur_p->data[i].p;
break;
}
// set probability for top n_probs tokens
}
// set probability for top n_probs tokens
result.probs.reserve(max_probs);
for (size_t i = 0; i < std::min(max_probs, n_probs); i++) {
result.probs.push_back({
cur_p->data[i].id,
common_detokenize(ctx, {cur_p->data[i].id}, special),
cur_p->data[i].p
});
// break if we have all the necessary data
if (result.probs.size() == n_probs && found_sampled_tok) {
break;
}
}
} else {
// TODO: optimize this with min-p optimization
std::vector<llama_token_data> cur = get_token_probabilities(ctx, idx);
bool found_sampled_tok = false;
result.probs.reserve(n_probs);
for (int i = 0; i < n_vocab; i++) {
// set probability for sampled token
for (size_t i = 0; i < n_vocab; i++) {
// set probability for sampled token
if (cur[i].id == result.tok) {
found_sampled_tok = true;
result.prob = cur[i].p;
break;
}
// set probability for top n_probs tokens
}
// set probability for top n_probs tokens
result.probs.reserve(n_probs);
for (size_t i = 0; i < std::min(n_vocab, n_probs); i++) {
result.probs.push_back({
cur[i].id,
common_detokenize(ctx, {cur[i].id}, special),
cur[i].p
});
// break if we have all the necessary data
if (result.probs.size() == n_probs && found_sampled_tok) {
break;
}
}
}
}
@ -2894,7 +2891,7 @@ struct server_context {
completion_token_output result;
result.tok = id;
result.text_to_send = common_token_to_piece(ctx, result.tok, params_base.special);
result.prob = 1.0f; // set later
result.prob = 1.0f; // TODO: set it here instead of doing inside populate_token_probs
if (slot.params.sampling.n_probs > 0) {
populate_token_probs(slot, result, slot.params.post_sampling_probs, params_base.special, tok_idx);