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标题: LightRAG学习 [打印本页]

作者: 链载Ai    时间: 昨天 11:55
标题: LightRAG学习

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255);">LightRAG是一个用于处理知识图谱和向量数据库的框架,主要用于信息检索和知识管理。以下是对其核心组件、功能和流程的全面解析。

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;font-size: 17px;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255); ">1. 核心组件

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;font-size: 17px;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255); ">2. 主要功能

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;font-size: 17px;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255); ">3. 查询流程

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255); ">aquery方法解析

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255);">aquery方法是LightRAG类中的一个异步方法,负责处理用户的查询请求。它根据传入的查询参数选择不同的查询模式,并调用相应的查询函数。以下是对该方法及其关联代码的详细解析。

ingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei", sans-serif;font-size: 17px;letter-spacing: normal;text-align: start;background-color: rgb(255, 255, 255); ">方法定义

asyncdefaquery(self,query:str,paramueryParam=QueryParam()):

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-参数:

方法流程

关联代码

以下是与aquery方法相关的代码片段:

1.查询模式的实现:

3.查询完成处理:

awaitself._query_done()

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hybrid_query方法解析

hybrid_query方法是LightRAG框架中的一个异步函数,旨在结合本地和全局上下文来处理用户的查询。它通过提取关键词并构建相应的上下文,最终生成一个响应。以下是对该方法的详细解析:

方法定义

async def hybrid_query(
query,
knowledge_graph_inst: BaseGraphStorage,
entities_vdb: BaseVectorStorage,
relationships_vdb: BaseVectorStorage,
text_chunks_db: BaseKVStorage[TextChunkSchema],
query_param: QueryParam,
global_config: dict,
) -> str:

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方法流程


hybrid 查询流程详解

关键词提取

query:自建组合的分红方式

通过提示词:

---Role---
You are a helpful assistant tasked with identifying both high-level and low-level keywords in the user's query.
---Goal---
Given the query, list both high-level and low-level keywords. High-level keywords focus on overarching concepts or themes, while low-level keywords focus on specific entities, details, or concrete terms.
---Instructions---
- Output the keywords in JSON format.- The JSON should have two keys:- "high_level_keywords" for overarching concepts or themes.- "low_level_keywords" for specific entities or details.
######################-Examples-######################Example 1:
Query: "How does international trade influence global economic stability?"################Output:{"high_level_keywords": ["International trade", "Global economic stability", "Economic impact"],"low_level_keywords": ["Trade agreements", "Tariffs", "Currency exchange", "Imports", "Exports"]}#############################Example 2:
Query: "What are the environmental consequences of deforestation on biodiversity?"################Output:{"high_level_keywords": ["Environmental consequences", "Deforestation", "Biodiversity loss"],"low_level_keywords": ["Species extinction", "Habitat destruction", "Carbon emissions", "Rainforest", "Ecosystem"]}#############################Example 3:
Query: "What is the role of education in reducing poverty?"################Output:{"high_level_keywords": ["Education", "Poverty reduction", "Socioeconomic development"],"low_level_keywords": ["School access", "Literacy rates", "Job training", "Income inequality"]}#############################-Real Data-######################Query: 自建组合的分红方式######################Output:

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从模型获取到如下数据:

{
"high_level_keywords": ["自建组合", "分红方式"],
"low_level_keywords": ["投资策略", "收益分配", "股票组合", "财务管理"]
}

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关键词检索

分别用关键词调用_build_local_query_context 和 _build_global_query_context 方法获取检索内容。

async def _build_local_query_context(query,knowledge_graph_inst: BaseGraphStorage,# 这是一个知识图谱的实例,提供对图形数据的存储和查询功能。entities_vdb: BaseVectorStorage,# 这是一个存储实体的向量数据库实例,用于根据查询获取相关的实体。text_chunks_db: BaseKVStorage[TextChunkSchema],# 这是一个存储文本块的键值存储实例,用于查找与实体相关的文本单元。query_param: QueryParam,):results = await entities_vdb.query(query, top_k=query_param.top_k)# 这是从 entities_vdb 中查询得到的结果,包含与输入查询相关的实体信息。使用 top_k 参数限制返回的实体数量。node_datas = await asyncio.gather(# 包含从知识图谱中获取的节点数据。通过 asyncio.gather 并行获取每个实体的详细信息。*[knowledge_graph_inst.get_node(r["entity_name"]) for r in results])node_degrees = await asyncio.gather(# 包含每个实体的度(即与该实体相连的边的数量)*[knowledge_graph_inst.node_degree(r["entity_name"]) for r in results])node_datas = [# 包含每个节点的详细信息、实体名称和排名。通过 zip 函数将 results、node_datas 和 node_degrees 组合在一起。{**n, "entity_name": k["entity_name"], "rank": d}for k, n, d in zip(results, node_datas, node_degrees)if n is not None]use_text_units = await _find_most_related_text_unit_from_entities(# 获取的与实体相关的文本单元node_datas, query_param, text_chunks_db, knowledge_graph_inst)
use_relations = await _find_most_related_edges_from_entities(# 获取的与实体相关的关系node_datas, query_param, knowledge_graph_inst)......

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_build_global_query_context 的区别

数据来源:buildlocal_query_context主要从实体向量数据库中查询相关的实体,而buildglobal_query_context则从关系向量数据库中查询相关的关系。

处理的对象:buildlocal_query_context处理的是节点(实体),而buildglobal_query_context处理的是边(关系)。

上下文构建:buildlocal_query_context主要构建与特定查询相关的上下文,而buildglobal_query_context则构建与关键词相关的全局上下文。

返回结果: 两者都返回格式化的字符串,但内容不同。前者返回的是与查询相关的实体和文本单元,后者返回的是与关键词相关的关系和实体。

前者专注于具体的查询,而后者则关注更广泛的关键词和相关的关系。








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