[GCC10] fix mxnet and update to 1.6.0 tag

[mrodozov]

please test
super weird bug, it was always there but gcc10 made it fail
got lucky that the author was also using gcc10 I guess

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/6749/console Started: 2020/06/02 20:58

[cmsbuild]

A new Pull Request was created by @mrodozov (Mircho Rodozov) for branch IB/CMSSW_11_2_X/master.

@cmsbuild, @smuzaffar, @mrodozov, @tulamor can you please review it and eventually sign? Thanks.
cms-bot commands are listed here

[cmsbuild]

+1
Tested at: 1af320b
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6d3744/6749/summary.html
CMSSW: CMSSW_11_2_X_2020-06-02-1100
SCRAM_ARCH: slc7_amd64_gcc820

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-6d3744/6749/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 36
• DQMHistoTests: Total histograms compared: 2783666
• DQMHistoTests: Total failures: 51
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2783565
• DQMHistoTests: Total skipped: 50
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 35 files compared)
• Checked 152 log files, 16 edm output root files, 36 DQM output files

[smuzaffar]

@hqucms any objections on moving to mxnet 1.6?
@slava77 , the comparison difference are in L1 and message logger. Can you please give it a look?

[slava77]

@slava77 , the comparison difference are in L1 and message logger. Can you please give it a look?

these are apparently false-positives.
I do not see anything changing related to mxnet. We run it with particleNet tagger in the standard workflows, which means that the update at least did not change the behavior for the existing model.

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_11_2_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @silviodonato, @dpiparo (and backports should be raised in the release meeting by the corresponding L2)