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Generic hessian PDF covmat

Emanuele Roberto Nocera requested to merge generic_hessian_pdf_covmat into master

Created by: comane

This PR adds to covmats.pdferr_plus_covmat the option for an asymmetric hessian set. The way in which the PDF covmat is computed follows core.HessianStats.

TODO:

  • Are there some references on how to compute the hessian pdf covmat?
  • understand why the ABMP1_6_5_nnlo set (symmhessian) has such a large chi2 (see report below)

https://vp.nnpdf.science/9rRTyXihSsqCDE3h4qmZ5A==

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