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Weave Panels allow users to directly query W&B for data, visualize the results, and further analyze interactively.


See this report to see how this team used Weave Panels to visualize their benchmarks.

Create a Weave Panel

To add a Weave Panel:

  • In your Workspace, click Add Panel and select Weave.
  • In a Report:
    • Type /weaveand select Weave to add an independent Weave Panel.
    • Type /Panel grid -> Panel grid and then click Add panel -> Weave to add a Weave Panel associated with a set of runs.


Weave expression

Weave expressions allow the user to query the data stored in W&B - from runs, to artifacts, to models, to tables, and more. Common weave expression that you can generate when you log a Table with wandb.log({"cifar10_sample_table":<MY_TABLE>}):

Let's break this down:

  • runs is a variable automatically injected in Weave Panel Expressions when the Weave Panel is in a Workspace. Its "value" is the list of runs which are visible for that particular Workspace. Read about the different attributes available within a run here.
  • summary is an op which returns the Summary object for a Run. Note: ops are "mapped", meaning this op is applied to each Run in the list, resulting in a list of Summary objects.
  • ["cifar10_sample_table"] is a Pick op (denoted with brackets), with a parameter of "predictions". Since Summary objects act like dictionaries or maps, this operation "picks" the "predictions" field off of each Summary object.

To learn how to write your own queries interactively, see out this report, which goes from the basic operations available in Weave to other advanced visualizations of your data.

Weave configuration

Select the gear icon on the upper left corner of the panel to expand the Weave configuration. This allows the user to configure the type of panel and the parameters for the result panel.

Weave result panel

Finally, the Weave result panel renders the result of the Weave expression, using the selected weave panel, configured by the configuration to display the data in an interactive form. The following images shows a Table and a Plot of the same data.

Basic operations


You can easily sort from the column options


You can either filter directly in the query or using the filter button in the top left corner (second image)


Map operations iterate over lists and apply a function to each element in the data. You can do this directly with a Weave query or by inserting a new column from the column options.


You can groupby using a query or from the column options.


The concat operation allows you to concatenate 2 tables and concatenate or join from the panel settings


It is also possible to join tables directly in the query, where:

  • project("luis_team_test", "weave_example_queries").runs.summary["short_table_0"].table.rows.concat is the first table
  • project("luis_team_test", "weave_example_queries").runs.summary["short_table_1"].table.rows.concat is the second table
  • (row) => row["Label"] are selectors for each table, determining which column to join on
  • "Table1" and "Table2" are the names of each table when joined
  • true and false are for left and right inner/outer join settings

Runs object

Among other things, Weave allows you to access the runs object, which stores a detailed record of your experiments. You can find more details about it in this section of the report but, as quick overview, runs object has available:

  • summary: A dictionary of information that summarizes the run's results. This can be scalars like accuracy and loss, or large files. By default, wandb.log() sets the summary to the final value of a logged time series. You can set the contents of the summary directly. Think of the summary as the run's outputs.
  • history: A list of dictionaries meant to store values that change while the model is training such as loss. The command wandb.log() appends to this object.
  • config: A dictionary of the run's configuration information, such as the hyperparameters for a training run or the preprocessing methods for a run that creates a dataset Artifact. Think of these as the run's "inputs"

Access Artifacts

Artifacts are a core concept in W&B. They are a versioned, named collection of files and directories. Use Artifacts to track model weights, datasets, and any other file or directory. Artifacts are stored in W&B and can be downloaded or used in other runs. You can find more details and examples in this section of the report. Artifacts are normally accessed from the project object:

  • project.artifactVersion(): returns the specific artifact version for a given name and version within a project
  • project.artifact(""): returns the artifact for a given name within a project. You can then use .versions to get a list of all versions of this artifact
  • project.artifactType(): returns the artifactType for a given name within a project. You can then use .artifacts to get a list of all artifacts with this type
  • project.artifactTypes: returns a list of all artifact types under the project
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