In this quickstart guide, you will package and deploy a text classification pipeline model.

If you want to go step-by-step through these concepts and more, check out the learn model deployment tutorial for a detailed introduction to model deployment and Truss.

Install the Truss package

Install the latest version of Truss with:

pip install --upgrade truss

Create a Truss

To get started, create a Truss with the following terminal command:

truss init text-classification

When prompted, give your Truss a name like Text classification.

Then, navigate to the newly created directory:

cd text-classification

Implement the Model class

One of the two essential files in a Truss is model/ In this file, you write a Model class: an interface between the ML model that you’re packaging and the model server that you’re running it on.

The code to load and invoke a model in a Jupyter notebook or Python script maps directly to the code used in model/

There are two member functions that you must implement in the Model class:

  • load() loads the model onto the model server. It runs exactly once when the model server is spun up or patched.
  • predict() handles model inference. It runs every time the model server is called.

Here’s the complete model/ for the text classification model:

  • Code

  • Diff

from transformers import pipeline

class Model:
    def __init__(self, **kwargs):
        self._model = None

    def load(self):
        self._model = pipeline("text-classification")

    def predict(self, model_input):
        return self._model(model_input)

Add model dependencies

The other essential file in a Truss is config.yaml, which configures the model serving environment. For a complete list of the config options, see the config reference.

The pipeline model relies on Transformers and PyTorch. These dependencies must be specified in the Truss config.

In config.yaml, find the line requirements. Replace the empty list with:

  • Code

  • Diff

  - torch==2.0.1
  - transformers==4.30.0

No other configuration is needed.

Deploy the Truss

Truss is maintained by Baseten, which provides infrastructure for running ML models in production. We’ll use Baseten as the remote host for your model.

Get an API key

To set up the Baseten remote, you’ll need a Baseten API key. If you don’t have a Baseten account, no worries, just sign up for an account and you’ll be issued plenty of free credits to get you started.

Run truss push

With your Baseten API key ready to paste when prompted, you can deploy your model:

truss push

You can monitor your model deployment from your model dashboard on Baseten.

Invoke the model

After the model has finished deploying, you can invoke it from the terminal.


truss predict -d '"Truss is awesome!"'


    "label": "POSITIVE",
    "score": 0.999873161315918

Learn more

You’ve completed the quickstart by packaging, deploying, and invoking an ML model with Truss! Next up: