Add overfit metric to vp
Created by: RoyStegeman
As discussed in Amsterdam I've implemented the overfit metric to vp, and included a plot and table by default in the comparefit report.
I'll open the metric per dataset grouping in a later PR.
I don't really like how it's implemented in the comparefits report, but I believe including something like fits::fitcontext
in the loop already means that the default use_t0=False
is included in the loop.
example report: https://vp.nnpdf.science/ihtLSPpKTBa45jD2UEH4bw==
Also to prevent confusion we may went to use something other than "deltachi2", but ideally also something better than "overfit metric"?