Data + Model Versioning

Dataset versioning, model versioning, pipeline tracking with flexible and lightweight building blocks

Use W&B Artifacts for dataset versioning, model versioning, and tracking dependencies and results across machine learning pipelines. Think of an artifact as a versioned folder of data. You can store entire datasets directly in artifacts, or use artifact references to point to data in other systems like S3, GCP, or your own system.

Try the Guide to W&B Artifacts for an end-to-end example of using Artifacts for dataset and model versioning.


1. Log an artifact

Initialize a run and log an artifact, for example a dataset version that you're using to train a model.

run = wandb.init(job_type="dataset-creation")
artifact = wandb.Artifact('my-dataset', type='dataset')

2. Use the artifact

Start a new run and pull down that saved artifact, for example to use the dataset to train a model.

run = wandb.init(job_type="model-training")
artifact = run.use_artifact('my-dataset:latest')
artifact_dir =

3. Log a new version

If an artifact changes, re-run the same artifact creation script. In this case, imagine the data in the my-dataset.txt file changes. This same script will capture the new version neatly — we'll checksum the artifact, identify that something changed, and track the new version. If nothing changes, we don't reupload any data or create a new version.

run = wandb.init(job_type="dataset-creation")
artifact = wandb.Artifact('my-dataset', type='dataset')
# Imagine more lines of text were added to this text file:
# Log that artifact, and we identify the changed file
# Now you have a new version of the artifact, tracked in W&B

Looking for a longer example with real model training? Try our Guide to W&B Artifacts.

How it works

Using our Artifacts API, you can log artifacts as outputs of W&B runs, or use artifacts as input to runs.

Since a run can use another run’s output artifact as input, artifacts and runs together form a directed graph. You don’t need to define pipelines ahead of time. Just use and log artifacts, and we’ll stitch everything together.

Here's an example artifact where you can see the summary view of the DAG, as well as the zoomed-out view of every execution of each step and every artifact version.

Artifacts resources

Learn more about using artifacts for data and model versioning:

Video Tutorial for W&B Artifacts

Follow along with our interactive tutorial and learn how to track your machine learning pipeline with W&B Artifacts.