Adding low pt muon MVA (muon POG)

[sscruz]

Muon POG plans to add a new muons MVA targetting low pt muons. Details are being discussed in https://its.cern.ch/jira/browse/CMSMUONS-158.
PR to include the new selector in cmssw will follow shortly

[cmsbuild]

A new Pull Request was created by @sscruz for branch master.

@cmsbuild, @smuzaffar, @gudrutis, @mrodozov can you please review it and eventually sign? Thanks.
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external issue cms-sw/cmsdist#4880

[mrodozov]

assign reconstruction

[cmsbuild]

New categories assigned: reconstruction

@slava77,@perrotta you have been requested to review this Pull request/Issue and eventually sign? Thanks

[slava77]

@sscruz
the same questions as in #4 apply here to the file size:
the new files are a factor of 3 larger than the presently used mu_BDTG_Run2017.weights.xml.
Is is because the trees are larger? or is there something with the new format which may be a bit wasteful.

[sscruz]

@slava77 indeed, the new BDT have a bit more trees (800 vs 1000), and each tree is also larger: we allow for a maximum depth of 4 instead of 2 now, and nodes with smaller size are allowed. It is expected that we have larger files then

[slava77]

I suggest to merge this with #4
This way we'll be able to test cms-sw/cmssw#26460 with the standard tools.

[slava77]

@mrodozov

sorry for not being clear in #5 (comment), I was making a comment to @sscruz asking to combine two PRs and address the comments in this one #4 (comment)

Based on the feedback so far, only the file renaming for the files introduced in #4 is missing.
So, a followup PR can be rather simple.