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LLM return logits with probabilities of each token, these probabilities can be converted to tokens/words with different technics: greedy decoding, beam search decoding, random sampling, etc. This requires writing user unfriendly post-processing even for the simplest scenario of greedy decoding. In order to make live easier we we combined all decoding scenarios into a single function call, where the decoding method and parameters are specified by arguments. In this PR we provide a user friendly API for text generation inspired by `generate` method from HuggingFace transformers library. - [x] enable calling tokenizers/detokenizers from LLMPipeline - [ ] add callback for streaming mode - done partially, need to improve - [x] rewritten samples with the current approach: [causal_lm/cpp/generate_pipeline/generate_sample.cpp#L73-L83](https://github.com/pavel-esir/openvino.genai/blob/generate_pipeline/text_generation/causal_lm/cpp/generate_pipeline/generate_sample.cpp#L73-L83) - [x] Multibatch greedy decoding - [ ] Speculative decoding - [ ] Grouped Beam Search decoding: ready for batch 1, need to rebase multibatch support after merging openvinotoolkit#349 - [x] Random sampling Example 1: Greedy search generation ``` LLMPipeline pipe(model_path, device); // Will try to load config from generation_config.json. // but if not found default velues for gready search will be used GenerationConfig config = pipe.generation_config(); cout << pipe(prompt, config.max_new_tokens(20)); ``` Example 2: TextStreaming mode ``` LLMPipeline pipe(model_path, device); GenerationConfig config = pipe.generation_config(); auto text_streamer = TextStreamer{pipe}; auto text_streamer_callback = [&text_streamer](std::vector<int64_t>&& tokens, LLMPipeline& pipe){ text_streamer.put(tokens[0]); }; pipe(prompt, config.max_new_tokens(20).set_callback(text_streamer_callback)); text_streamer.end(); ``` CVS-132907 CVS-137920 --------- Co-authored-by: Wovchena <vladimir.zlobin@intel.com> Co-authored-by: Ilya Lavrenov <ilya.lavrenov@intel.com> Co-authored-by: Alexander Suvorov <alexander.suvorov@intel.com> Co-authored-by: Yaroslav Tarkan <yaroslav.tarkan@intel.com> Co-authored-by: Xiake Sun <xiake.sun@intel.com> Co-authored-by: wenyi5608 <93560477+wenyi5608@users.noreply.github.com> Co-authored-by: Ekaterina Aidova <ekaterina.aidova@intel.com> Co-authored-by: guozhong wang <guozhong.wang@intel.com> Co-authored-by: Chen Peter <peter.chen@intel.com>
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