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Add jet fold hash

Dan Guest requested to merge dguest/athena:folder into main

This just adds a variable to flavor tagging. Nothing else should change.

We found that our flavor tagging networks were a bit overtrained on the ttbar dataset we normally use. We're considering working around this by adding a per-jet hash and training several networks, so we can avoid ever applying the tagger to a jet we trained on.

This is adding the first part: the hash. It mixes some hit and constituent info with the event number to get something pretty random.

Tagging @svanstro, @hartman, @bdong, @ligang

Edited by Dan Guest

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