LLM之基于llama-index部署本地embedding与GLM-4模型并初步搭建RAG（其他大模型也可，附上ollma方式运行）

黑夜寻白天

已于 2024-08-30 11:37:26 修改

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分类专栏： NLP入门文章标签： llama-index RAG

于 2024-08-20 14:31:38 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_44598554/article/details/141357018

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前言

日常没空，留着以后写

llama-index简介

官网：https://docs.llamaindex.ai/en/stable/

简介也没空，以后再写

注：先说明，随着官方的变动，代码也可能变动，大家运行不起来，可以进官网查查资料

加载本地embedding模型

如果没有找到 llama_index.embeddings.huggingface

那么：pip install llama_index-embeddings-huggingface

还不行进入官网，输入huggingface进行搜索

from llama_index.embeddings.huggingface import HuggingFaceEmbedding
from llama_index.core import Settings

Settings.embed_model = HuggingFaceEmbedding(
    model_name=f"{embed_model_path}",device='cuda'

)

加载本地LLM模型

还是那句话，如果以下代码不行，进官网搜索Custom LLM Model

from llama_index.core.llms import (
    CustomLLM,
    CompletionResponse,
    CompletionResponseGen,
    LLMMetadata,
)
from llama_index.core.llms.callbacks import llm_completion_callback
from transformers import AutoTokenizer, AutoModelForCausalLM

class GLMCustomLLM(CustomLLM):
    context_window: int = 8192  # 上下文窗口大小
    num_output: int = 8000  # 输出的token数量
    model_name: str = "glm-4-9b-chat"  # 模型名称
    tokenizer: object = None  # 分词器
    model: object = None  # 模型
    dummy_response: str = "My response"

    def __init__(self, pretrained_model_name_or_path):
        super().__init__()

        # GPU方式加载模型
        self.tokenizer = AutoTokenizer.from_pretrained(pretrained_model_name_or_path, device_map="cuda", trust_remote_code=True)
        self.model = AutoModelForCausalLM.from_pretrained(pretrained_model_name_or_path, device_map="cuda", trust_remote_code=True).eval()

        # CPU方式加载模型
        # self.tokenizer = AutoTokenizer.from_pretrained(pretrained_model_name_or_path, device_map="cpu", trust_remote_code=True)
        # self.model = AutoModelForCausalLM.from_pretrained(pretrained_model_name_or_path, device_map="cpu", trust_remote_code=True)
        self.model = self.model.float()

    @property
    def metadata(self) -> LLMMetadata:
        """Get LLM metadata."""
        # 得到LLM的元数据
        return LLMMetadata(
            context_window=self.context_window,
            num_output=self.num_output,
            model_name=self.model_name,
        )

    # @llm_completion_callback()
    # def complete(self, prompt: str, **kwargs: Any) -> CompletionResponse:
    #     return CompletionResponse(text=self.dummy_response)
    #
    # @llm_completion_callback()
    # def stream_complete(
    #     self, prompt: str, **kwargs: Any
    # ) -> CompletionResponseGen:
    #     response = ""
    #     for token in self.dummy_response:
    #         response += token
    #         yield CompletionResponse(text=response, delta=token)

    @llm_completion_callback()  # 回调函数
    def complete(self, prompt: str, **kwargs: Any) -> CompletionResponse:
        # 完成函数
        print("完成函数")

        inputs = self.tokenizer.encode(prompt, return_tensors='pt').cuda()  # GPU方式
        # inputs = self.tokenizer.encode(prompt, return_tensors='pt')  # CPU方式
        outputs = self.model.generate(inputs, max_length=self.num_output)
        response = self.tokenizer.decode(outputs[0])
        return CompletionResponse(text=response)

    @llm_completion_callback()
    def stream_complete(
        self, prompt: str, **kwargs: Any
    ) -> CompletionResponseGen:
        # 流式完成函数
        print("流式完成函数")

        inputs = self.tokenizer.encode(prompt, return_tensors='pt').cuda()  # GPU方式
        # inputs = self.tokenizer.encode(prompt, return_tensors='pt')  # CPU方式
        outputs = self.model.generate(inputs, max_length=self.num_output)
        response = self.tokenizer.decode(outputs[0])
        for token in response:
            yield CompletionResponse(text=token, delta=token)

基于本地模型搭建简易RAG

from typing import Any

from llama_index.core.llms import (
    CustomLLM,
    CompletionResponse,
    CompletionResponseGen,
    LLMMetadata,
)
from llama_index.core.llms.callbacks import llm_completion_callback
from transformers import AutoTokenizer, AutoModelForCausalLM
from llama_index.core import Settings,VectorStoreIndex,SimpleDirectoryReader
from llama_index.embeddings.huggingface import HuggingFaceEmbedding


class GLMCustomLLM(CustomLLM):
    context_window: int = 8192  # 上下文窗口大小
    num_output: int = 8000  # 输出的token数量
    model_name: str = "glm-4-9b-chat"  # 模型名称
    tokenizer: object = None  # 分词器
    model: object = None  # 模型
    dummy_response: str = "My response"

    def __init__(self, pretrained_model_name_or_path):
        super().__init__()

        # GPU方式加载模型
        self.tokenizer = AutoTokenizer.from_pretrained(pretrained_model_name_or_path, device_map="cuda", trust_remote_code=True)
        self.model = AutoModelForCausalLM.from_pretrained(pretrained_model_name_or_path, device_map="cuda", trust_remote_code=True).eval()

        # CPU方式加载模型
        # self.tokenizer = AutoTokenizer.from_pretrained(pretrained_model_name_or_path, device_map="cpu", trust_remote_code=True)
        # self.model = AutoModelForCausalLM.from_pretrained(pretrained_model_name_or_path, device_map="cpu", trust_remote_code=True)
        self.model = self.model.float()

    @property
    def metadata(self) -> LLMMetadata:
        """Get LLM metadata."""
        # 得到LLM的元数据
        return LLMMetadata(
            context_window=self.context_window,
            num_output=self.num_output,
            model_name=self.model_name,
        )

    # @llm_completion_callback()
    # def complete(self, prompt: str, **kwargs: Any) -> CompletionResponse:
    #     return CompletionResponse(text=self.dummy_response)
    #
    # @llm_completion_callback()
    # def stream_complete(
    #     self, prompt: str, **kwargs: Any
    # ) -> CompletionResponseGen:
    #     response = ""
    #     for token in self.dummy_response:
    #         response += token
    #         yield CompletionResponse(text=response, delta=token)

    @llm_completion_callback()  # 回调函数
    def complete(self, prompt: str, **kwargs: Any) -> CompletionResponse:
        # 完成函数
        print("完成函数")

        inputs = self.tokenizer.encode(prompt, return_tensors='pt').cuda()  # GPU方式
        # inputs = self.tokenizer.encode(prompt, return_tensors='pt')  # CPU方式
        outputs = self.model.generate(inputs, max_length=self.num_output)
        response = self.tokenizer.decode(outputs[0])
        return CompletionResponse(text=response)

    @llm_completion_callback()
    def stream_complete(
        self, prompt: str, **kwargs: Any
    ) -> CompletionResponseGen:
        # 流式完成函数
        print("流式完成函数")

        inputs = self.tokenizer.encode(prompt, return_tensors='pt').cuda()  # GPU方式
        # inputs = self.tokenizer.encode(prompt, return_tensors='pt')  # CPU方式
        outputs = self.model.generate(inputs, max_length=self.num_output)
        response = self.tokenizer.decode(outputs[0])
        for token in response:
            yield CompletionResponse(text=token, delta=token)


if __name__ == "__main__":


    # 定义你的LLM
    pretrained_model_name_or_path = r'/home/nlp/model/LLM/THUDM/glm-4-9b-chat'
    embed_model_path = '/home/nlp/model/Embedding/BAAI/bge-m3'

    Settings.embed_model = HuggingFaceEmbedding(
        model_name=f"{embed_model_path}",device='cuda'

    )

    Settings.llm = GLMCustomLLM(pretrained_model_name_or_path)

    documents = SimpleDirectoryReader(input_dir="home/xxxx/input").load_data()
    index = VectorStoreIndex.from_documents(
        documents,
    )


    # 查询和打印结果
    query_engine = index.as_query_engine()
    response = query_engine.query("萧炎的表妹是谁?")

    print(response)

ollama

from llama_index.core import VectorStoreIndex, SimpleDirectoryReader, Settings
from llama_index.embeddings.huggingface import HuggingFaceEmbedding
from llama_index.llms.ollama import Ollama

documents = SimpleDirectoryReader("data").load_data()

# bge-base embedding model
Settings.embed_model = HuggingFaceEmbedding(model_name="BAAI/bge-base-en-v1.5")

# ollama
Settings.llm = Ollama(model="llama3", request_timeout=360.0)

index = VectorStoreIndex.from_documents(
    documents,
)

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作者也新建了一个学习交流群，欢迎大家加入一起学习成长

通过链接获取二维码
链接：https://pan.baidu.com/s/1ZZZZ-ANJvMFHlanl-tbtew?pwd=9el1

参加链接：

LlamaIndex中的CustomLLM（本地加载模型）
llamaIndex 基于GPU加载本地embedding模型

官网文档

官网_starter_example_loca

官网_usage_custom