FAQ

How do I connect to ml.cern.ch outside CERN?

The service is not yet open in the CERN firewall.

Follow one of the documented recipes for remote access to CERN services in Teleworking Tips & Tricks.

My Notebook server is stuck during creating (longer than 10 minutes)

Each personal profile has a 1 GPU limit. If you attempt to use more than your allocated GPU quota, you may encounter issues with notebook startup. Navigating to the notebook in question, under the events tab you will see a quota exceeded message.

I cannot open any notebooks in my Notebook Server due to database is locked or unhandled error

When Jupyter notebooks are opened, the server keeps track of their state in an internal database (located inside ~/.local/share/jupyter/ folder in your home directory). If a Jupyter process gets terminated abruptly (e.g. due to an out-of-memory error), the database lock is not cleared properly, and future instances of Jupyter detect the lock and complain.

• Solution is to remove the folder ~/.local/share/jupyter/ and restart the notebook server

In case of any other issues, if this persists please contact us in the ML mattermost channel of IT-dep team.