Draft: Complex salt model for a unified tagger
Description
The primary purpose of this complex model is to allow feeding not-so-well-modelled variables into our future unified tagger, without potentially increasing data-MC disagreement in b-tagging and c-tagging discriminants.
Any such extra input, which increases separation power for s-tagging and/or q/g-tagging only, should be fed into init_nets_secondary.
Review checklist:
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CI Passing -
Comments addressed -
Source branch is up to date with target