Experiments

Can I just set the run name to the run ID?

Yes. To overwrite the run name with the run ID, use the following code snippet:

Does W&B use the `multiprocessing` library?

Yes, W&B uses the multiprocessing library. As a result, scripts that call W&B directly need to guard their entry point s …

Does logging block my training?

“Is the logging function lazy? I don’t want to depend on the network to send results to your servers while executing loc …

Does your tool track or store training data?

To associate a dataset with a training run, pass a SHA or unique identifier to wandb.Run.config.update(…). W&B stores …

How can I access the data logged to my runs directly and programmatically?

The history object tracks metrics logged with wandb.log. To access the history object, use the API:

How can I compare images or media across epochs or steps?

To compare images or other media logged at different epochs or steps, expand the image panel and use the step slider to …

How can I configure the name of the run in my training code?

At the beginning of the training script, call wandb.init with a run name. For example: wandb.init(name=“my_awesome_run”) …

How can I define the local location for `wandb` files?

You can control where wandb stores its files locally by setting the following environment variables or, where noted, by …

How can I organize my logged charts and media in the W&B UI?

Organize logged charts and media into related groups by naming logged items with a shared prefix, which makes it easier …

How can I save the git commit associated with my run?

When you call wandb.init, W&B automatically collects Git information, including the remote repository link and the SHA o …

How can I see files that don't appear in the Files tab?

The Files tab shows a maximum of 10,000 files. To download all files, use the public API:

How can I use W&B with multiprocessing, for example distributed training?

This article explains how to use W&B in training programs that span multiple processes, such as distributed training job …

How do I add Plotly or Bokeh Charts into Tables?

Direct integration of Plotly or Bokeh figures into tables isn’t supported. Instead, export the figures to HTML and inclu …

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

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

How do I get the random run name in my script?

Call a run object’s .save() method to save the current run. Retrieve the name using the run object’s name attribute.

How do I launch multiple runs from one script?

To log multiple runs within a single script, you must finish each previous run before you start a new one. The following …

How do I log a list of values?

You can log a list of values, such as per-step losses, with wandb.Run.log(). The following examples show two common appr …

How do I plot multiple lines on a plot with a legend?

Create a multi-line custom chart with wandb.plot.line_series(). Go to the project page to view the line chart. To add a …

How do I programmatically access the human-readable run name?

To access the .name attribute of a wandb.Run, use the following code:

I didn't name my run. Where is the run name coming from?

If a run isn’t explicitly named, W&B assigns a random name to identify it in your project. Examples of random names are …

InitStartError: Error communicating with wandb process

This error indicates that the W&B library can’t launch the process that synchronizes data to the server. To resolve the …

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. If you need to run experiments wit …

My run's state is `crashed` on the UI but is still running on my machine. What do I do to get my data back?

This state usually means you lost connection to your machine during training. To recover your data, run wandb sync PATH_ …

What does wandb.init do to my training process?

When wandb.init() runs in a training script, an API call creates a run object on the W&B servers. A new process starts t …

What happens if I pass a class attribute into wandb.Run.log()?

Avoid passing class attributes into wandb.Run.log(). Attributes may change before the network call executes. When you st …

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 integrate W&B into my project, but I don't want to upload any images or media?

W&B supports projects that log only scalars by letting you specify which files or data to upload. For an example of logg …

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 …

What is the difference between wandb.init modes?

When you call wandb.init, you can choose a mode that controls how the client communicates with the W&B server. The follo …

Why am I seeing fewer data points than I logged?

When you visualize metrics against an X-axis other than Step, expect to see fewer data points. You must log metrics at t …

Why are steps missing from a CSV metric export?

Export limits can prevent you from exporting the entire run history as a CSV or with the run.history API. To access the …

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

Metric names in W&B must follow GraphQL naming conventions so that you can sort and filter them in the UI. Valid metric …

Why does my process stop responding when using Hydra with W&B?

This page explains how to resolve unresponsive processes that occur when you start a process with Hydra alongside W&B. I …

Why does my training hang with distributed training?

This article helps you resolve training hangs when you use W&B with distributed training frameworks, so your runs can st …

Why is nothing showing up in my graphs?

If the message “No visualization data logged yet” appears, the script hasn’t executed the first wandb.log call. This can …

Why is the same metric appearing more than once?

When you log multiple data types under the same key, W&B splits them in the database. This results in multiple entries o …

Will wandb slow down my training?

W&B has a minimal impact on training performance under normal usage conditions. Normal use includes logging at a rate of …