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 Job ID Name Coverage
  Build
passed #166579
docker
build_linux_36

00:10:36

passed #166580
macosx
build_macosx_36

00:09:22

 
  Deploy
passed #166581
docker
deploy_beta

00:07:12