Merge branch 'update_cnntrainer' into 'master'

Set default optimizer, updated cnntrainer to replace unsupported optimizer by...

See merge request !25
4 jobs for master in 6 minutes and 57 seconds (queued for 1 second)
Status Job ID Name Coverage
  Windows
passed #269210
Windows10
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  Linux
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masterJobLinux

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failed #269425
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failed #269211
masterJobLinux

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