Importing caffe results in ImportError: "No module named google.protobuf.internal" (import enum_type_wrapper)
This is probably because you have two python environments in your machine, the one provided by your linux distribution(pip) and the other by the anaconda environment (/home/username/anaconda2/bin/pip).
Try installing protobuf for both environments to be sure
pip install protobuf
/home/username/anaconda2/bin/pip install protobuf
If you are using Ubuntu, try installing protobuf using
sudo apt-get install protobufIt solved the same problem that I faced.