读破万卷,神交古人,突破ChatGPT4096的Token限制,建立自己的垂直领域资料人工智能助理

ChatGPT的泛用性极高,上知天文,下通地理,参考古今,博稽中外,几乎无所不知,无所不晓。但如果涉及垂直领域的专业知识点,ChatGPT难免也会有语焉不详,闪烁其词的毛病,本次我们将特定领域的学习材料“喂”给ChatGPT,让它“学习”后再来回答专业问题。

专业领域语料问题

所谓专业领域语料问题,可以理解为特定范围内的知识图谱,也就是给GPT提供前置的检索维度,举个例子,大家都读过鲁迅的名篇《从百草园到三味书屋》,文章中涉及一个“美女蛇”的典故,假设我们没有给GPT设置一个特定范围,直接问“美女蛇”的相关问题:

一望而知,ChatGPT对于“美女蛇”典故的理解出现了信息偏差问题,它以为“美女蛇”指的是《白蛇传》中的白素贞和许仙以及法海的故事。

但其实我们都知道,《从百草园到三味书屋》中“美女蛇”指的是人首蛇身的怪物,能唤人名,倘一答应,夜间便要来吃这人的肉的故事。

所以,如果我们想谈论“美女蛇”相关的问题,必须让ChatGPT有一个特定的“语境”,它才能理解真正要谈论的话题,所以需要把《从百草园到三味书屋》作为语料“喂”给ChatGPT才可以,当然了《从百草园到三味书屋》作为人尽皆知的杂文,它肯定默认存储于ChatGPT的语料库中,但假设如果某一个领域的论文或者其他资料,并未出现在ChatGPT的语料库中,而该文章的长度又超过ChatGPT输入的4096个token的限制,那么就非常麻烦了,所以让ChatGPT具备学习“新材料”的能力就显得十分必要了。

llama_index配置语料索引

LlamaIndex(GPT Index)是一个针对特定语料检索的GPT项目,可以通过索引文件把外部语料数据和GPT连接起来,首先安装项目:

pip3 install llama-index

注意该项目依赖langchain模块,为了确保不出问题,最好升级一下langchain模块:

pip3 install --upgrade langchain

LlamaIndex所做的是将我们的原始语料数据转换成一个基于向量的索引,这对检索来说是非常高效的。它将使用这个索引,根据查询和数据的相似性,找到最相关的部分。然后,它将把检索到的内容插入到它将发送给GPT的引导词(prompt)中,这样GPT就有了回答问题的“语境”:

具体工作流:

将本地答案数据集,转为向量存储到向量数据(index.json)

当用户输入查询的问题时,把问题转为向量然后从向量数据库中查询相近的答案topK 这个时候其实就是我们最普遍的问答查询方案,在没有GPT的时候就直接返回相关的答案整个流程就结束了。

基于GPT可以优化回答内容的整体结构,在单纯的搜索场景下其实这个优化没什么意义。但如果在垂直领域特定的聊天场景下,引用相关领域内容回复时,数据检索会更加精准。

首先把《从百草园到三味书屋》这篇文章写入到项目的data目录中,随后编写代码:

import os  
from llama_index import SimpleDirectoryReader, GPTSimpleVectorIndex,LLMPredictor,ServiceContext  from langchain import OpenAI  os.environ["OPENAI_API_KEY"] = 'apikey'  class LLma:  # 建立本地索引  def create_index(self,dir_path="./data"):  # 读取data文件夹下的文档  documents = SimpleDirectoryReader(dir_path).load_data()  index = GPTSimpleVectorIndex.from_documents(documents)  print(documents)  # 保存索引  index.save_to_disk('./index.json')

这里通过GPTSimpleVectorIndex.from_documents方法读取data目录中的语料文章,随后转换为向量索引存储在本地磁盘的index.json文件中。

执行建立索引方法:

if __name__ == '__main__':  llma = LLma()  # 建立索引  llma.create_index()

索引的内容:

{"index_struct": {"__type__": "simple_dict", "__data__": {"index_id": "86c83b5a-a975-43ab-8505-cbc8f0ae68e2", "summary": null, "nodes_dict": {"da552579-e0f4-4ee0-be68-a3c392e39dc2": "a2521cfa-13c5-49b2-9cfd-7206fe493666", "c1f7df04-5e6c-4327-a0cc-4a3489d50d19": "68b609e3-2ec5-4de2-ac43-eb28105364ca"}, "doc_id_dict": {"87411099-60d8-4272-a7d1-6e8676fc42a0": ["da552579-e0f4-4ee0-be68-a3c392e39dc2", "c1f7df04-5e6c-4327-a0cc-4a3489d50d19"]}, "embeddings_dict": {"da552579-e0f4-4ee0-be68-a3c392e39dc2": [0.004821529611945152, -0.005787167698144913, 0.00886388961225748, -0.0005273548304103315, -0.0007779211737215519, 0.022242968901991844, -0.0035828494001179934, -0.023534925654530525, -0.03012790158390999, -0.014744291082024574, 0.004718306474387646, -0.0010788505896925926, -0.006236688699573278, 0.0033247910905629396, 0.01692862994968891, 0.02300216071307659, 0.01628931239247322, 0.008157975040376186, 0.028822625055909157, -0.0011337919859215617, 0.006499741692095995, 0.02746407315135002, 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-0.008222210220992565, -0.017960945144295692, 0.020941250026226044, -0.0187258031219244]}, "text_id_to_doc_id": {"da552579-e0f4-4ee0-be68-a3c392e39dc2": "87411099-60d8-4272-a7d1-6e8676fc42a0", "c1f7df04-5e6c-4327-a0cc-4a3489d50d19": "87411099-60d8-4272-a7d1-6e8676fc42a0"}}}}

llama_index根据向量索引进行语义化查询

llama_index可以在本地匹配向量索引后再构建提示词:

class LLma:  def query_index(self,prompt,index_path="./index.json"):  # 加载索引  local_index = GPTSimpleVectorIndex.load_from_disk(index_path)  # 查询索引  res = local_index.query(prompt)  print(res)

通过GPTSimpleVectorIndex.load_from_disk方法将向量索引导入,执行方法:

if __name__ == '__main__':  llma = LLma()  # 建立索引  #llma.create_index()  # 查询索引  llma.query_index("讲一下美女蛇的故事")

程序返回:

美女蛇的故事可以追溯到古庙里的一个读书人。晚间,他在院子里纳凉的时候,突然听到有人在叫他的名字。他四面看时,却见一个美女的脸露在墙头上,向他一笑,隐去了。他很高兴,但竟给那走来夜谈的老和尚识破了机关,说他脸上有些妖气,一定遇见“美女蛇”了。

可以看到,“美女蛇”的故事终于是我们想要的“美女蛇”的故事了。

llama_index模型定制化

llama_index默认的答案生成模型方案为text-davinci-002,我们也可以定制化适合自己的模型配置:

class LLma:  def __init__(self) -> None:  self.llm_predictor = LLMPredictor(llm=OpenAI(temperature=0, model_name="text-davinci-003",max_tokens=1800))  self.service_context = ServiceContext.from_defaults(llm_predictor=self.llm_predictor)  # 查询本地索引  def query_index(self,prompt,index_path="./index.json"):  # 加载索引  local_index = GPTSimpleVectorIndex.load_from_disk(index_path)  # 查询索引  res = local_index.query(prompt)  print(res)  # 建立本地索引  def create_index(self,dir_path="./data"):  # 读取data文件夹下的文档  documents = SimpleDirectoryReader(dir_path).load_data()  index = GPTSimpleVectorIndex.from_documents(documents,service_context=self.service_context)  print(documents)  # 保存索引  index.save_to_disk('./index.json')  if __name__ == '__main__':  llma = LLma()

这里通过初始化函数定制self.llm_predictor属性,生成本地向量索引时,通过service_context参数进行动态调用即可:index = GPTSimpleVectorIndex.from_documents(documents,service_context=self.service_context) 。

结语

藉此,我们就可以通过垂直领域语料来“定制化”ChatGPT的回答了,最后奉上项目地址:github.com/zcxey2911/llama_index_examples_python3.10,与君共觞。

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