LiteLLM

Weave automatically tracks and logs LLM calls made via LiteLLM, after weave.init() is called.

Traces

It's important to store traces of LLM applications in a central database, both during development and in production. You'll use these traces for debugging, and as a dataset that will help you improve your application.

Note: When using LiteLLM, make sure to import the library using import litellm and call the completion function with litellm.completion instead of from litellm import completion. This ensures that all functions and attributes are correctly referenced.

Weave will automatically capture traces for LiteLLM. You can use the library as usual, start by calling weave.init():

If not already logged in, you will be prompted to log into wandb and authorize using your wandb account in the next step.

Weave will now track and log all LLM calls made through LiteLLM. You can view the traces in the Weave web interface.

Wrapping with your own ops

Weave ops make results reproducible by automatically versioning code as you experiment, and they capture their inputs and outputs. Simply create a function decorated with @weave.op that calls into LiteLLM's completion function and Weave will track the inputs and outputs for you. Here's an example:

Create a Model for easier experimentation

Organizing experimentation is difficult when there are many moving pieces. By using the Model class, you can capture and organize the experimental details of your app like your system prompt or the model you're using. This helps organize and compare different iterations of your app.

In addition to versioning code and capturing inputs/outputs, Models capture structured parameters that control your application's behavior, making it easy to find what parameters worked best. You can also use Weave Models with serve, and Evaluations.

In the example below, you can experiment with different models and temperatures:

Function Calling

LiteLLM supports function calling for compatible models. Weave will automatically track these function calls.

We automatically capture the functions you used in the prompt and keep them versioned.