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llama : restore prefix space in llama tokenizer #4081

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merged 2 commits into from
Nov 15, 2023
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llama : restore prefix space in llama tokenizer #4081

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735ffe3
Revert "dont add space when using special tokens"
cebtenzzre Nov 14, 2023
5e89942
do not add space prefix if the first token is special
cebtenzzre Nov 15, 2023
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5 changes: 4 additions & 1 deletion llama.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6283,7 +6283,10 @@ static std::vector<llama_vocab::id> llama_tokenize_internal(const llama_vocab &
// by modifying llm_tokenizer_x to operate with string offsets like pre-tokenizer
// and passing 'add space prefix' as bool argument
//
auto raw_text = (special ? "" : " ") + fragment.raw_text.substr(fragment.offset, fragment.length);
auto raw_text = fragment.raw_text.substr(fragment.offset, fragment.length);
if (&fragment == &fragment_buffer.front()) {
raw_text = " " + raw_text; // prefix with space if the first token is not special
}

#ifdef PRETOKENIZERDEBUG
fprintf(stderr,"TT: (%ld %ld %ld) '%s'\n", raw_text.length(), fragment.offset, fragment.length, raw_text.c_str());
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