Enhancements to GBRForest/Tree for converting TMVA classifiers (74X)

[lgray]

Backport of #10275

@bendavid

[cmsbuild]

A new Pull Request was created by @lgray (Lindsey Gray) for CMSSW_7_4_X.

Enhancements to GBRForest/Tree for converting TMVA classifiers (74X)

It involves the following packages:

CondFormats/EgammaObjects

@ggovi, @cmsbuild, @mmusich, @diguida, @cerminar can you please review it and eventually sign? Thanks.
@apfeiffer1 this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@Degano you are the release manager for this.
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[diguida]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: af39e10
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10370/11497/summary.html

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[diguida]

@lgray sorry for late signing, and thanks for the reminder.
@davidlange6 what is the proposed strategy here? I think that CMSSW_7_6_0_pre2 RelVal should confirm that no changes are seen. In this case, you can merge, but this will trigger a full build (interface changes).
Unfortunately I missed this at the ORP meeting: do you want me to add it to the TWiki for reference?

[slava77]

@davidlange6 please check
this is blocking further backports now (10475)

[davidlange6]

+1