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:

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 …

Can I run wandb offline?

If training occurs on an offline machine, use the following steps to upload results to the servers: 1. Set the environme …

Does W&B use the `multiprocessing` library?

Yes, W&B uses the multiprocessing library. An error message like the following indicates a possible issue: To resolve th …

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?

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

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

The history object tracks metrics logged with wandb.log. Access the history object using the API:

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

Expand the image panel and use the step slider to navigate through images from different steps. This process facilitates …

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

At the beginning of the training script, call wandb.init with an experiment name. For example: wandb.init(name=“my_aweso …

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

WANDB_DIR= or wandb.init(dir= ): Controls the location of the wandb folder created for your training script. Defaults to …

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

The / character separates logged panels in the W&B UI. By default, the segment of the logged item’s name before the / de …

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

When wandb.init is invoked, the system automatically collects git information, including the remote repository link and …

How can I see files that do not 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 wandb with multiprocessing, e.g. distributed training?

If a training program uses multiple processes, structure the program to avoid making wandb method calls from processes w …

How do I add Plotly or Bokeh Charts into Tables?

Direct integration of Plotly or Bokeh figures into tables is not supported. Instead, export the figures to HTML and incl …

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?

Finish previous runs before starting new runs to log multiple runs within a single script. The recommended way to do thi …

How do I log a list of values?

These examples show logging losses a couple of different ways using wandb.Run.log(). For more, see the documentation on …

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

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

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

The .name attribute of a wandb.Run is accessible as follows:

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

If a run is not 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 library encounters an issue launching the process that synchronizes data to the server. Th …

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 …

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?

You likely lost connection to your machine during training. Recover data by running wandb sync PATH_TO_RUN (/models/ref/ …

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 servers. A new process starts to st …

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 storin …

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 allowing explicit specification of files or data for upload. Refer to thi …

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?

These modes are available: online (default): The client sends data to the wandb server. offline: The client stores data …

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 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 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 …

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 …