Expose positivity threshold in the runcard
Created by: scarlehoff
This is the maximum value that the replica's positivity loss can have to get a POS_PASS tag in .fitinfo. By default it has the conservative 1e-6 value, but now it can be changed directly from the runcard as sometimes might not a good idea to be too strict. A comparison below:
I used as baseline the 130920-nnpdf40_jcm_iterated fit from Cameron, for which 66% of the replica passed. This was with a threshold of 1e-6.
I've launched a fit with 1e-4 and another one with 1e-3, the results are below:
For 1e-4, 74% of the replicas passed positivity
https://vp.nnpdf.science/VLGnw8h8SPOVI4HxJ0YaXA==/
For 1e-3, 90% of the replicas passed positivity.