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A CLI and library for interacting with the Weights and Biases API.

Project description

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Use W&B to organize and analyze machine learning experiments. It's framework-agnostic and lighter than TensorBoard. Each time you run a script instrumented with wandb, we save your hyperparameters and output metrics. Visualize models over the course of training, and compare versions of your models easily. We also automatically track the state of your code, system metrics, and configuration parameters.

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  • Store hyper-parameters used in a training run
  • Search, compare, and visualize training runs
  • Analyze system usage metrics alongside runs
  • Collaborate with team members
  • Replicate historic results
  • Run parameter sweeps
  • Keep records of experiments available forever

Documentation →


pip install wandb

In your training script:

import wandb
# Your custom arguments defined here
args = ...

wandb.init(config=args, project="my-project")
wandb.config["more"] = "custom"

def training_loop():
    while True:
        # Do some machine learning
        epoch, loss, val_loss = ...
        # Framework agnostic / custom metrics
        wandb.log({"epoch": epoch, "loss": loss, "val_loss": val_loss})

If you're already using Tensorboard or TensorboardX, you can integrate with one line:


Running your script

Run wandb login from your terminal to signup or authenticate your machine (we store your api key in ~/.netrc). You can also set the WANDB_API_KEY environment variable with a key from your settings.

Run your script with python and all metadata will be synced to the cloud. You will see a url in your terminal logs when your script starts and finishes. Data is staged locally in a directory named wandb relative to your script. If you want to test your script without syncing to the cloud you can set the environment variable WANDB_MODE=dryrun.

If you are using docker to run your code, we provide a wrapper command wandb docker that mounts your current directory, sets environment variables, and ensures the wandb library is installed. Training your models in docker gives you the ability to restore the exact code and environment with the wandb restore command.

Web Interface

Sign up for a free account → Watch the video Introduction video →

Detailed Usage

Framework specific and detailed usage can be found in our documentation.


To run basic test use make test. More detailed information can be found at

We use circleci for CI.

Academic Researchers

If you'd like a free academic account for your research group, reach out to us →

We make it easy to cite W&B in your published paper. Learn more →


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