Runs

Best practices to organize hyperparameter searches

Set unique tags with wandb.init(tags=‘your_tag’). This allows efficient filtering of project runs by selecting the corre …

Can I group runs without using the 'Group' feature?

Yes, you can also use tags or custom metadata to categorize runs. That can be done using the Group button which is avail …

Can I rerun a grid search?

If a grid search completes but some W&B Runs need re-execution due to crashes, delete the specific W&B Runs to re-run. T …

Can you group runs by tags?

A run can have multiple tags, so grouping by tags is not supported. Add a value to the config object for these runs and …

How can I change how frequently to log system metrics?

To configure the frequency to log system metrics, set _stats_sampling_interval to a number of seconds, expressed as a fl …

How can I change the colors of each run in the same group?

Changing the colors of individual runs within a group is not possible. All runs in the same group share a common color.

How can I delete multiple runs in bulk instead of one at a time?

Use the public API to delete multiple runs in a single operation:

How can I disable logging of system metrics to W&B?

To disable logging of system metrics, set _disable_stats to True:

How can I log a metric that doesn't change over time such as a final evaluation accuracy?

Using run.log( ) updates the final accuracy correctly. By default, run.log( ) updates run.settings ‘final_accuracy’ , wh …

How can I log additional metrics after a run completes?

There are several ways to manage experiments. For complex workflows, use multiple runs and set the group parameters in w …

How can I recover deleted runs?

Learn how to recover recently deleted runs in the W&B App for up to 7 days.

How do I download the console log file from a run?

W&B captures your training script’s stdout and stderr output and stores it as output.log in the run’s file storage. Wher …

How do I fix `CommError, Run does not exist` during a sweep?

If you see both CommError, Run does not exist and ERROR Error uploading during a sweep, the most likely cause is that yo …

How do I fix the error `resume='must' but run (<run_id>) doesn't exist`?

If you encounter the error resume=‘must’ but run ( ) doesn’t exist, the run you are attempting to resume does not exist …

How do I log NLP metrics and text outputs in W&B?

W&B handles NLP experiments well through scalar metric logging for corpus-level scores (BLEU, ROUGE, perplexity) and wan …

How do I log gradients and model weights with wandb.watch()?

wandb.watch() hooks into a PyTorch model’s parameters and gradients and logs histograms of their values at regular inter …

How do I log runs launched by continuous integration or internal tools?

To launch automated tests or internal tools that log to W&B, create a Service Account on the team settings page. This ac …

How do I paginate through large API results in W&B?

The W&B Public API returns results in pages. For projects with hundreds or thousands of runs, loading everything at once …

How do I resolve permission errors when logging a run?

To resolve permission errors when logging a run to a W&B entity, follow these steps: Verify entity and project names: En …

How do I set up W&B alerts and notifications?

W&B supports two types of alerts: automated alerts configured in User Settings (run finished, run crashed) and programma …

How do I update run config, tags, and notes via the W&B API?

After a run finishes you can edit its config values, display name, tags, and notes using the Public API without re-runni …

How do I use W&B with JAX?

W&B does not have a JAX-specific integration, but works well with JAX training loops through direct calls to wandb.log() …

How do I use the parallel coordinates chart in W&B?

The parallel coordinates chart visualizes the relationship between hyperparameters and metrics across many runs. Each ru …

How many runs can I create per project?

Limit each project to approximately 10,000 runs for optimal performance.

Is it possible to change the group assigned to a run after completion?

You can change the group assigned to a completed run using the API. This feature does not appear in the web UI. Use the …

Is it possible to move a run from one project to another?

You can move a run from one project to another by following these steps: Navigate to the project page with the run to be …

Why are steps missing from a CSV metric export?

Export limits can prevent the entire run history from being exported as a CSV or using the run.history API. To access th …

Why do my workspace settings not persist between sessions?

Workspace layout changes (panel positions, filters, grouping) are stored in your browser session by default. If you clos …

Why is console output not captured for my run?

W&B captures your script’s stdout and stderr output and stores it as output.log on the run’s Files tab. By default, the …

Why is my W&B run slow to initialize or upload?

Slow wandb.init() or sluggish metric uploads are usually caused by one of four things: network latency, large media payl …

Why is my run showing as crashed?

W&B marks a run as Crashed when it stops receiving heartbeats from the process that called wandb.init(), without the pro …