Merge branch 'facenet' into 'master'

Improve graph and session handling in facenet class

See merge request !13
3 jobs for master in 17 minutes and 48 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_36 #166579
docker

00:10:36

passed build_macosx_36 #166580
macosx

00:09:22

 
  Deploy
passed deploy_beta #166581
docker

00:07:12