如果你在 Colab 中打开这个 Notebook，可能需要先安装 LlamaIndex 🦙。

%pip install llama-index-embeddings-openai
%pip install llama-index-vector-stores-pinecone

!pip install llama-index

import os
import pinecone

api_key = os.environ["PINECONE_API_KEY"]
pinecone.init(api_key=api_key, environment="eu-west1-gcp")

准备示例“现有”Pinecone 向量存储

创建索引

indexes = pinecone.list_indexes()
print(indexes)

['quickstart-index']

if "quickstart-index" not in indexes:
    # dimensions are for text-embedding-ada-002
    pinecone.create_index(
        "quickstart-index", dimension=1536, metric="euclidean", pod_type="p1"
    )

pinecone_index = pinecone.Index("quickstart-index")

pinecone_index.delete(deleteAll="true")

{}

定义示例数据

我们创建 4 本示例书籍

books = [
    {
        "title": "To Kill a Mockingbird",
        "author": "Harper Lee",
        "content": (
            "To Kill a Mockingbird is a novel by Harper Lee published in"
            " 1960..."
        ),
        "year": 1960,
    },
    {
        "title": "1984",
        "author": "George Orwell",
        "content": (
            "1984 is a dystopian novel by George Orwell published in 1949..."
        ),
        "year": 1949,
    },
    {
        "title": "The Great Gatsby",
        "author": "F. Scott Fitzgerald",
        "content": (
            "The Great Gatsby is a novel by F. Scott Fitzgerald published in"
            " 1925..."
        ),
        "year": 1925,
    },
    {
        "title": "Pride and Prejudice",
        "author": "Jane Austen",
        "content": (
            "Pride and Prejudice is a novel by Jane Austen published in"
            " 1813..."
        ),
        "year": 1813,
    },
]

添加数据

我们将示例书籍添加到 Weaviate 的 “Book” 类中（并对 content 字段进行嵌入

import uuid
from llama_index.embeddings.openai import OpenAIEmbedding

embed_model = OpenAIEmbedding()

entries = []
for book in books:
    vector = embed_model.get_text_embedding(book["content"])
    entries.append(
        {"id": str(uuid.uuid4()), "values": vector, "metadata": book}
    )
pinecone_index.upsert(entries)

{'upserted_count': 4}

查询“现有”Pinecone 向量存储

from llama_index.vector_stores.pinecone import PineconeVectorStore
from llama_index.core import VectorStoreIndex
from llama_index.core.response.pprint_utils import pprint_source_node

你必须正确选择一个类属性作为 “text” 字段。

vector_store = PineconeVectorStore(
    pinecone_index=pinecone_index, text_key="content"
)

retriever = VectorStoreIndex.from_vector_store(vector_store).as_retriever(
    similarity_top_k=1
)

nodes = retriever.retrieve("What is that book about a bird again?")

让我们检查检索到的节点。可以看到书籍数据被加载为 LlamaIndex Node 对象，并将 “content” 字段作为主文本。

pprint_source_node(nodes[0])

Document ID: 07e47f1d-cb90-431b-89c7-35462afcda28
Similarity: 0.797243237
Text: author: Harper Lee title: To Kill a Mockingbird year: 1960.0  To
Kill a Mockingbird is a novel by Harper Lee published in 1960......

其余字段应作为元数据加载（位于 metadata 中）

nodes[0].node.metadata

{'author': 'Harper Lee', 'title': 'To Kill a Mockingbird', 'year': 1960.0}