Version 1.0.0+git20180821.99bd997-2 of caffe is marked for autoremoval from testing on Thu 14 Feb 2019. It depends (transitively) on scikit-learn, affected by #907806. You should try to prevent the removal by fixing these RC bugs.
This package has been
orphaned. This means that it does not have a real
maintainer at the moment. Please consider adopting this package
if you are interested in it. Please see bug number #915186 for more information.