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 do I fix `Rate limit exceeded` errors when logging metrics?

If you receive an HTTP 429 Rate limit exceeded error when calling wandb.log(), you are exceeding the rate limit quota fo …

How do I fix an `anaconda 400 error` during a sweep?

The following error usually occurs when you do not log the metric that you are optimizing: To fix this, make sure you ar …

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 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 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 are my metrics missing from wandb.log()?

If metrics logged with wandb.log() are not appearing in the W&B UI, there are several common causes. SDK version issue C …

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 does my workspace load slowly?

Workspaces can load slowly when a project has a large number of metrics, runs, or panels. Here are common causes and fix …

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 …