sklearn is not sklearn

If you came across complaint no module named sklearn and you are sure that you “installed” that with pip install sklearn. Sorry, sklearn is scikit-learn instead of sklearn.

pip install scikit-learn

should solve the problem.

Dropbox is syncing all files except some

Check if you own the file. It maybe belong to root. In particular if you run sudo docker, the output file will belong to root and thus is not synced.