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Make weight initialization reproducible

Emanuele Roberto Nocera requested to merge reproducibility into master

Created by: APJansen

This is an attempt to address #1916 (closed), branching off of #1905 because it uses the MultiInitializer to initialize the preprocessing weights.

I have checked that when doing any of:

  • n3fit runcard.yaml 1 -r 3
  • n3fit runcard.yaml 2 -r 3
  • n3fit runcard.yaml 1 -r 2

the preprocessing weights, NN weights and PDF output right after creation are identical for replica number 2.

Even after rebasing on trvl-mask-layers though, results do not remain identical.

I don't know where the difference is coming from, as the tr/vl masks, and the invcovmats, are also the same for replica 2.

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