Wandb Callback Handler

Weights & Biases Prompts is a suite of LLMOps tools built for the development of LLM-powered applications.

The WandbCallbackHandler is integrated with W&B Prompts to visualize and inspect the execution flow of your index construction, or querying over your index and more. You can use this handler to persist your created indices as W&B Artifacts allowing you to version control your indices.

python

%pip install llama-index-callbacks-wandb
%pip install llama-index-llms-openai

python

import os
from getpass import getpass

if os.getenv("OPENAI_API_KEY") is None:
    os.environ["OPENAI_API_KEY"] = getpass(
        "Paste your OpenAI key from:"
        " https://platform.openai.com/account/api-keys\n"
    )
assert os.getenv("OPENAI_API_KEY", "").startswith(
    "sk-"
), "This doesn't look like a valid OpenAI API key"
print("OpenAI API key configured")

python

from llama_index.core.callbacks import CallbackManager
from llama_index.core.callbacks import LlamaDebugHandler
from llama_index.callbacks.wandb import WandbCallbackHandler
from llama_index.core import (
    VectorStoreIndex,
    SimpleDirectoryReader,
    SimpleKeywordTableIndex,
    StorageContext,
)
from llama_index.llms.openai import OpenAI

Setup LLM

python

from llama_index.core import Settings

Settings.llm = OpenAI(model="gpt-4", temperature=0)

W&B Callback Manager Setup

Option 1: Set Global Evaluation Handler

python

import llama_index.core
from llama_index.core import set_global_handler

set_global_handler("wandb", run_args={"project": "llamaindex"})
wandb_callback = llama_index.core.global_handler

Option 2: Manually Configure Callback Handler

Also configure a debugger handler for extra notebook visibility.

python

llama_debug = LlamaDebugHandler(print_trace_on_end=True)

# wandb.init args
run_args = dict(
    project="llamaindex",
)

wandb_callback = WandbCallbackHandler(run_args=run_args)

Settings.callback_manager = CallbackManager([llama_debug, wandb_callback])

After running the above cell, you will get the W&B run page URL. Here you will find a trace table with all the events tracked using Weights and Biases' Prompts feature.

1. Indexing

Download Data

python

!mkdir -p 'data/paul_graham/'
!wget 'https://raw.githubusercontent.com/run-llama/llama_index/main/docs/examples/data/paul_graham/paul_graham_essay.txt' -O 'data/paul_graham/paul_graham_essay.txt'

python

docs = SimpleDirectoryReader("./data/paul_graham/").load_data()

python

index = VectorStoreIndex.from_documents(docs)

1.1 Persist Index as W&B Artifacts

python

wandb_callback.persist_index(index, index_name="simple_vector_store")

1.2 Download Index from W&B Artifacts

python

from llama_index.core import load_index_from_storage

storage_context = wandb_callback.load_storage_context(
    artifact_url="ayut/llamaindex/simple_vector_store:v0"
)

# Load the index and initialize a query engine
index = load_index_from_storage(
    storage_context,
)

2. Query Over Index

python

query_engine = index.as_query_engine()
response = query_engine.query("What did the author do growing up?")
print(response, sep="\n")

Close W&B Callback Handler

When we are done tracking our events we can close the wandb run.

python

wandb_callback.finish()