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add-token-draft-v2
Meng Zhang 2023-11-29 17:00:58 +08:00
parent a42fde18ac
commit 8c770c6404
1 changed files with 46 additions and 37 deletions
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83
crates/llama-cpp-bindings/src/engine.cc
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@ -29,6 +29,7 @@ struct Request {
std::vector<llama_token> tokens;
size_t i_batch = -1;
size_t n_past = 0;
size_t n_draft = 0;
int32_t multibyte_pending = 0;
std::string generated_text;
@ -213,50 +214,58 @@ class TextInferenceEngineImpl : public TextInferenceEngine {
continue;
}
auto logits = llama_get_logits_ith(ctx, i_batch);
auto next_token = std::distance(logits, std::max_element(logits, logits + n_vocab));
// FIXME: ensure batching logic always put i_batch - request.n_draft in this batch.
for (int k = -request.n_draft; k < 1; ++k) {
auto logits = llama_get_logits_ith(ctx, i_batch);
auto next_token = std::distance(logits, std::max_element(logits, logits + n_vocab));
request.n_past += request.tokens.size();
request.n_past += request.tokens.size();
request.tokens.clear();
request.tokens.push_back(next_token);
request.tokens.clear();
request.tokens.push_back(next_token);
const auto token_str = llama_token_to_piece(ctx, next_token);
request.generated_text += token_str;
const auto token_str = llama_token_to_piece(ctx, next_token);
request.generated_text += token_str;
// FIXME: Hack for codellama to simplify tabby's implementation.
const bool is_eos = next_token == eos_id || token_str == " <EOT>";
// FIXME: Hack for codellama to simplify tabby's implementation.
const bool is_eos = next_token == eos_id || token_str == " <EOT>";
if (request.multibyte_pending > 0) {
request.multibyte_pending -= token_str.size();
} else if (token_str.size() == 1) {
const char c = token_str[0];
// 2-byte characters: 110xxxxx 10xxxxxx
if ((c & 0xE0) == 0xC0) {
request.multibyte_pending = 1;
// 3-byte characters: 1110xxxx 10xxxxxx 10xxxxxx
}
else if ((c & 0xF0) == 0xE0) {
request.multibyte_pending = 2;
// 4-byte characters: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
} else if ((c & 0xF8) == 0xF0) {
request.multibyte_pending = 3;
}
else {
request.multibyte_pending = 0;
}
}
if (request.multibyte_pending == 0) {
rust::String generated_text;
try {
generated_text = is_eos ? "" : request.generated_text;
} catch (const std::invalid_argument& e) {
fprintf(stderr, "%s:%d [%s] - ignoring non utf-8/utf-16 output\n", __FILE__, __LINE__, __func__);
if (request.multibyte_pending > 0) {
request.multibyte_pending -= token_str.size();
} else if (token_str.size() == 1) {
const char c = token_str[0];
// 2-byte characters: 110xxxxx 10xxxxxx
if ((c & 0xE0) == 0xC0) {
request.multibyte_pending = 1;
// 3-byte characters: 1110xxxx 10xxxxxx 10xxxxxx
}
else if ((c & 0xF0) == 0xE0) {
request.multibyte_pending = 2;
// 4-byte characters: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
} else if ((c & 0xF8) == 0xF0) {
request.multibyte_pending = 3;
}
else {
request.multibyte_pending = 0;
}
}
result.push_back({request.id, generated_text});
request.generated_text.clear();
if (request.multibyte_pending == 0) {
rust::String generated_text;
try {
generated_text = is_eos ? "" : request.generated_text;
} catch (const std::invalid_argument& e) {
fprintf(stderr, "%s:%d [%s] - ignoring non utf-8/utf-16 output\n", __FILE__, __LINE__, __func__);
}
result.push_back({request.id, generated_text});
request.generated_text.clear();
}
if (k < 0 && next_token != request.tokens[request.tokens.size() + k]) {
// FIXME: shift kv cache
break;
}
}
}
}