Les houches example

[vschutze-alt]

Added an example showing how to use colibri to perform a fit for the Les Houches parametrisation.

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[comane]

the folder structure should be something like

les_houches_example/les_houches

where in the les_houches_example folder there is a pyproject.toml file that allows one to install a les_houches exec and in the les_houches folder there is the model definition.

Moreover, I would suggest that we try run a model-specific closure test, rather than generating the Level0 data from an NNPDF pdf

[comane]

Hi @vschutze-alt in order to do model specific closure tests you need to add to the runcard something like:

closure_test_pdf: colibri_model
closure_test_model_settings:
  model: les_houches_example

and then specify the input values for the parameters.

Here is the PR in which model specific closure tests were introduced: #280

[comane]

Also, please change all the names from example to les houches in a consistent way.
It will be much easier doing it now rather than in a month.

[LucaMantani]

I left a few comments, in particular the fitted_flavours variable was still around but never used, I suggested to remove it everywhere.

[LucaMantani]

It looks good to me!

[comane]

Before merging, can we have a list of sanity checks that the model is actually physical?

I would like to see sum rules conservation especially to hold

[comane]

Something else that would be great to have, I'll add it to the list of 1.0, is a model-specific .github workflow using the les houches model, instead on relying on any external models, to test that the model-scpecific closure tests are working fine and are not broken by some changes.