We do not assert any limits beyond rate limiting. Our Python client will automatically do an exponential backoff and retry requests that exceed limits, so this should be transparent to you. It will say “Network failure” on the command line.
For unpaid accounts, we may reach out in extreme cases where usage exceeds reasonable thresholds.
The W&B API is rate limited by IP and API key. New accounts are restricted to 200 requests per minute. This rate allows you to run approximately 15 processes in parallel and have them report without being throttled. If the wandb client detects it's being limited, it will backoff and retry sending the data in the future. If you need to run more than 15 processes in parallel send an email to contact@wandb.com.
The maximum file size for new accounts is 2GB. A single run is allowed to store 10 GB of data. If you need to store larger files or more data per run, contact us at contact@wandb.com.
Metrics are sampled to 1500 data points by default before displaying in the UI. Generally you shouldn't be calling wandb.log more than a few times per second or wandb may start to interfere with your training run's performance. For scalars, you can have tens of thousands of step and hundreds of metrics. If you have histograms, we recommend limiting to thousands of steps. If you send us more that that, your data will be saved and tracked, but the query performance will be slowed down.
While a run is in progress we tail the last 5000 lines of your log for you in the UI. After a run is completed the entire log is archived and can be downloaded from an individual run page.