IPEX-LLM API# IPEX-LLM PyTorch API Optimize Model Load Optimized Model IPEX-LLM transformers-style API Hugging Face transformers AutoModel AutoModelForCausalLM AutoModel AutoModelForSpeechSeq2Seq AutoModelForSeq2SeqLM Native Model IPEX-LLM LangChain API LLM Wrapper of LangChain Hugging Face transformers Format Native Model Embeddings Wrapper of LangChain Hugging Face transformers AutoModel Native Model