Metrics

Can I just log metrics, no code or dataset examples?

By default, W&B does not log dataset examples. By default, W&B logs code and system metrics. Two methods exist to turn o …

Can I log metrics on two different time scales?

For example, I want to log training accuracy per batch and validation accuracy per epoch. Yes, log indices like batch an …

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 disable logging of system metrics to W&B?

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

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 overwrite the logs from previous steps?

To overwrite logs from previous steps, use forking and rewind.

How often are system metrics collected?

Metrics collect by default every 10 seconds. For higher resolution metrics, email [e-mail].

Is it possible to plot the max of a metric rather than plot step by step?

Create a scatter plot of the metric. Open the Edit menu and select Annotations. From there, plot the running maximum of …

Is it possible to save metrics offline and sync them to W&B later?

By default, wandb.init starts a process that syncs metrics in real time to the cloud. For offline use, set two environme …

Optimizing multiple metrics

To optimize multiple metrics in a single run, use a weighted sum of the individual metrics. Log the new combined metric …

What happens when I log millions of steps to W&B? How is that rendered in the browser?

The number of points sent affects the loading time of graphs in the UI. For lines exceeding 1,000 points, the backend sa …

What if I want to log some metrics on batches and some metrics only on epochs?

To log specific metrics in each batch and standardize plots, log the desired x-axis values alongside the metrics. In the …

Why am I seeing fewer data points than I logged?

When visualizing metrics against an X-axis other than Step, expect to see fewer data points. Metrics must log at the sam …

Why can't I sort or filter metrics with certain characters?

Metric names in W&B must follow GraphQL naming conventions to ensure they can be properly sorted and filtered in the UI. …

Why is nothing showing up in my graphs?

If the message “No visualization data logged yet” appears, the script has not executed the first wandb.log call. This si …

Why is the same metric appearing more than once?

When logging various data types under the same key, split them in the database. This results in multiple entries of the …