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Zephyr query engine

ZephyrQueryEnginePack #

Bases: BaseLlamaPack

Source code in llama_index/packs/zephyr_query_engine/base.py 
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class ZephyrQueryEnginePack(BaseLlamaPack):
    def __init__(self, documents: List[Document]) -> None:
        """初始化参数。"""
        try:
            import torch
            from transformers import BitsAndBytesConfig
        except ImportError:
            raise ImportError(
                "Dependencies missing, run "
                "`pip install torch transformers accelerate bitsandbytes`"
            )

        quantization_config = BitsAndBytesConfig(
            load_in_4bit=True,
            bnb_4bit_compute_dtype=torch.float16,
            bnb_4bit_quant_type="nf4",
            bnb_4bit_use_double_quant=True,
        )

        try:
            llm = HuggingFaceLLM(
                model_name="HuggingFaceH4/zephyr-7b-beta",
                tokenizer_name="HuggingFaceH4/zephyr-7b-beta",
                query_wrapper_prompt=PromptTemplate(
                    "<|system|>\n</s>\n<|user|>\n{query_str}</s>\n<|assistant|>\n"
                ),
                context_window=3900,
                max_new_tokens=256,
                model_kwargs={"quantization_config": quantization_config},
                generate_kwargs={
                    "do_sample": True,
                    "temperature": 0.7,
                    "top_k": 50,
                    "top_p": 0.95,
                },
                device_map="auto",
            )
        except Exception:
            print(
                "Failed to load and quantize model, likely due to CUDA being missing. "
                "Loading full precision model instead."
            )
            llm = HuggingFaceLLM(
                model_name="HuggingFaceH4/zephyr-7b-beta",
                tokenizer_name="HuggingFaceH4/zephyr-7b-beta",
                query_wrapper_prompt=PromptTemplate(
                    "<|system|>\n</s>\n<|user|>\n{query_str}</s>\n<|assistant|>\n"
                ),
                context_window=3900,
                max_new_tokens=256,
                generate_kwargs={
                    "do_sample": True,
                    "temperature": 0.7,
                    "top_k": 50,
                    "top_p": 0.95,
                },
                device_map="auto",
            )

        # set tokenizer for proper token counting
        from transformers import AutoTokenizer

        tokenizer = AutoTokenizer.from_pretrained("HuggingFaceH4/zephyr-7b-beta")
        set_global_tokenizer(tokenizer.encode)

        service_context = ServiceContext.from_defaults(
            llm=llm, embed_model="local:BAAI/bge-base-en-v1.5"
        )

        self.llm = llm
        self.index = VectorStoreIndex.from_documents(
            documents, service_context=service_context
        )

    def get_modules(self) -> Dict[str, Any]:
        """获取模块。"""
        return {"llm": self.llm, "index": self.index}

    def run(self, query_str: str, **kwargs: Any) -> Any:
        """运行流水线。"""
        query_engine = self.index.as_query_engine(**kwargs)
        return query_engine.query(query_str)

get_modules #

get_modules() -> Dict[str, Any]

获取模块。

Source code in llama_index/packs/zephyr_query_engine/base.py 
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def get_modules(self) -> Dict[str, Any]:
    """获取模块。"""
    return {"llm": self.llm, "index": self.index}

run #

run(query_str: str, **kwargs: Any) -> Any

运行流水线。

Source code in llama_index/packs/zephyr_query_engine/base.py 
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def run(self, query_str: str, **kwargs: Any) -> Any:
    """运行流水线。"""
    query_engine = self.index.as_query_engine(**kwargs)
    return query_engine.query(query_str)