LlamaIndex 知识库

了解如何将 LlamaIndex 检索器或向量存储用作知识库。

LlamaIndexKnowledgeBase 允许我们将 LlamaIndex 检索器或向量存储用作知识库。

用法

pip install llama-index-core llama-index-readers-file llama-index-embeddings-openai

llamaindex_kb.py

from pathlib import Path
from shutil import rmtree

import httpx
from agno.agent import Agent
from agno.knowledge.llamaindex import LlamaIndexKnowledgeBase
from llama_index.core import (
    SimpleDirectoryReader,
    StorageContext,
    VectorStoreIndex,
)
from llama_index.core.retrievers import VectorIndexRetriever
from llama_index.core.node_parser import SentenceSplitter


data_dir = Path(__file__).parent.parent.parent.joinpath("wip", "data", "paul_graham")
if data_dir.is_dir():
    rmtree(path=data_dir, ignore_errors=True)
data_dir.mkdir(parents=True, exist_ok=True)

url = "https://raw.githubusercontent.com/run-llama/llama_index/main/docs/docs/examples/data/paul_graham/paul_graham_essay.txt"
file_path = data_dir.joinpath("paul_graham_essay.txt")
response = httpx.get(url)
if response.status_code == 200:
    with open(file_path, "wb") as file:
        file.write(response.content)
    print(f"File downloaded and saved as {file_path}")
else:
    print("Failed to download the file")


documents = SimpleDirectoryReader(str(data_dir)).load_data()

splitter = SentenceSplitter(chunk_size=1024)

nodes = splitter.get_nodes_from_documents(documents)

storage_context = StorageContext.from_defaults()

index = VectorStoreIndex(nodes=nodes, storage_context=storage_context)

retriever = VectorIndexRetriever(index)

# Create a knowledge base from the vector store
knowledge_base = LlamaIndexKnowledgeBase(retriever=retriever)

# Create an agent with the knowledge base
agent = Agent(knowledge_base=knowledge_base, search_knowledge=True, debug_mode=True, show_tool_calls=True)

# Use the agent to ask a question and print a response.
agent.print_response("Explain what this text means: low end eats the high end", markdown=True)

参数

参数	类型	默认值	描述
retriever	BaseRetriever	None	LlamaIndex 检索器，用于查询知识库。
loader	Optional[Callable]	None	可选的调用函数，用于将文档加载到知识库中。

LlamaIndexKnowledgeBase 是 AgentKnowledge 类的子类，并拥有与其相同的参数。

开发者资源

• 查看 Cookbook