Is it possible to change the group assigned to a run after completion?

Yes. Use the W&B API to update the group property on a completed run programmatically.

You can change the group assigned to a completed run using the API. This feature does not appear in the web UI. Use the following code to update the group:

import wandb

api = wandb.Api()
run = api.run("<ENTITY>/<PROJECT>/<RUN_ID>")
run.group = "NEW-GROUP-NAME"
run.update()

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Runs