Debugging Machine Learning at CMS Level 1 Trigger

Setting the scene Recently I was taking part in some debugging of an ML model deployment for the CMS Level 1 Trigger in Run 3. The Level 1 Trigger is the tier of processing at the CMS experiment. It’s responsible for computing which particles and other physics quantities can be seen in an LHC collision, and making a decision whether that particular collision is worthy of being read out from the…