如何为您的代理部署添加语义搜索

{
    ...
    "store": {
        "index": {
            "embed": "openai:text-embedding-3-small",
            "dims": 1536,
            "fields": ["$"]
        }
    }
}

# In pyproject.toml
[project]
dependencies = [
    "langchain>=0.3.8"
]

langchain>=0.3.8

def search_memory(state: State, *, store: BaseStore):
    # Search the store using semantic similarity
    # The namespace tuple helps organize different types of memories
    # e.g., ("user_facts", "preferences") or ("conversation", "summaries")
    results = store.search(
        namespace=("memory", "facts"),  # Organize memories by type
        query="your search query",
        limit=3  # number of results to return
    )
    return results

{
    ...
    "store": {
        "index": {
            "embed": "path/to/embedding_function.py:embed",
            "dims": 1536,
            "fields": ["$"]
        }
    }
}

# path/to/embedding_function.py
from openai import AsyncOpenAI

client = AsyncOpenAI()

async def aembed_texts(texts: list[str]) -> list[list[float]]:
    """Custom embedding function that must:
    1. Be async
    2. Accept a list of strings
    3. Return a list of float arrays (embeddings)
    """
    response = await client.embeddings.create(
        model="text-embedding-3-small",
        input=texts
    )
    return [e.embedding for e in response.data]

from langgraph_sdk import get_client

async def search_store():
    client = get_client()
    results = await client.store.search_items(
        ("memory", "facts"),
        query="your search query",
        limit=3  # number of results to return
    )
    return results

# Use in an async context
results = await search_store()