Cause: The version of neptune.cls you downloaded expects specific fonts (e.g., newtxtext, Fira Sans, or custom math fonts) that are not installed on your system.
Fix: Install the required font packages via tlmgr install newtx (TeX Live) or manually download the fonts. Alternatively, edit neptune.cls and comment out or replace font calls with standard ones (e.g., \RequirePackagetimes).
In the context of Python and Neptune.ai, .cls is not a standard default file extension generated by the library (unlike .csv or .json). The term typically arises in two scenarios: neptune.cls download
If you are looking to download experiment data or configuration classes from the Neptune cloud to your local machine, here is the standard workflow. Cause: The version of neptune
run = neptune.init_run( project="workspace/project-name", api_token="YOUR_API_TOKEN", with_id="PROJ-123" # The ID of the run you want to download from ) If you are looking to download experiment data