Milvus Vector Store

In this notebook we are going to show a quick demo of using the MilvusVectorStore.

import logging
import sys

# Uncomment to see debug logs
# logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)
# logging.getLogger().addHandler(logging.StreamHandler(stream=sys.stdout))

from llama_index import VectorStoreIndex, SimpleDirectoryReader, Document
from llama_index.vector_stores import MilvusVectorStore
from IPython.display import Markdown, display
import textwrap

Setup OpenAI

Lets first begin by adding the openai api key. This will allow us to access openai for embeddings and to use chatgpt.

import openai

openai.api_key = "sk-"

Generate our data

With our LLM set, lets start using the Milvus Index. As a first example, lets generate a document from the file found in the paul_graham_essay/data folder. In this folder there is a single essay from Paul Graham titled What I Worked On. To generate the documents we will use the SimpleDirectoryReader.

# load documents
documents = SimpleDirectoryReader("../data/paul_graham/").load_data()

print("Document ID:", documents[0].doc_id)
Document ID: d33f0397-b51a-4455-9b0f-88a101254d95

Create an index across the data

Now that we have a document, we can can create an index and insert the document. For the index we will use a GPTMilvusIndex. GPTMilvusIndex takes in a few arguments:

  • collection_name (str, optional): The name of the collection where data will be stored. Defaults to “llamalection”.

  • index_params (dict, optional): The index parameters for Milvus, if none are provided an HNSW index will be used. Defaults to None.

  • search_params (dict, optional): The search parameters for a Milvus query. If none are provided, default params will be generated. Defaults to None.

  • dim (int, optional): The dimension of the embeddings. If it is not provided, collection creation will be done on first insert. Defaults to None.

  • host (str, optional): The host address of Milvus. Defaults to “localhost”.

  • port (int, optional): The port of Milvus. Defaults to 19530.

  • user (str, optional): The username for RBAC. Defaults to “”.

  • password (str, optional): The password for RBAC. Defaults to “”.

  • use_secure (bool, optional): Use https. Defaults to False.

  • overwrite (bool, optional): Whether to overwrite existing collection with same name. Defaults to False.

# Create an index over the documnts
from import StorageContext

vector_store = MilvusVectorStore(dim=1536, overwrite=True)
storage_context = StorageContext.from_defaults(vector_store=vector_store)
index = VectorStoreIndex.from_documents(documents, storage_context=storage_context)

Query the data

Now that we have our document stored in the index, we can ask questions against the index. The index will use the data stored in itself as the knowledge base for chatgpt.

query_engine = index.as_query_engine()
response = query_engine.query("What did the author learn?")
print(textwrap.fill(str(response), 100))
The author learned several things during their time at Interleaf. They learned that it's better for
technology companies to be run by product people than sales people, that code edited by too many
people leads to bugs, that cheap office space is not worth it if it's depressing, that planned
meetings are inferior to corridor conversations, that big bureaucratic customers can be a dangerous
source of money, and that there's not much overlap between conventional office hours and the optimal
time for hacking. However, the most important thing the author learned is that the low end eats the
high end, meaning that it's advantageous to be the "entry level" option because if you're not,
someone else will be and will surpass you.
response = query_engine.query("What was a hard moment for the author?")
print(textwrap.fill(str(response), 100))
The author experienced a difficult moment when their mother had a stroke and was put in a nursing
home. The stroke destroyed her balance, and the author and their sister were determined to help her
get out of the nursing home and back to her house.

This next test shows that overwriting removes the previous data.

vector_store = MilvusVectorStore(dim=1536, overwrite=True)
storage_context = StorageContext.from_defaults(vector_store=vector_store)
index = VectorStoreIndex.from_documents(
    [Document(text="The number that is being searched for is ten.")], storage_context
query_engine = index.as_query_engine()
res = query_engine.query("Who is the author?")
print("Res:", res)
Res: I'm sorry, but based on the given context information, there is no information provided about the author.

The next test shows adding additional data to an already existing index.

del index, vector_store, storage_context, query_engine

vector_store = MilvusVectorStore(overwrite=False)
storage_context = StorageContext.from_defaults(vector_store=vector_store)
index = VectorStoreIndex.from_documents(documents, storage_context=storage_context)
query_engine = index.as_query_engine()
res = query_engine.query("What is the number?")
print("Res:", res)
Res: The number is ten.
res = query_engine.query("Who is the author?")
print("Res:", res)
Res: The author of the given context is Paul Graham.