Importing package can break due to an os.makedirs on initialization

[glennkroegel]

When importing the package the init.py loads from the dataset submodule from _all.py

At the top of this file is an os.makedirs which breaks the import if you are running in an environment without write permission.

It's possible to bypass this with a monkey-patch but this breaks in other places later on such as when using multi-processing in the explain_X function.

How essential is it to load these dataset functions on init? My case of not having write permission may be a bit of an edge case but putting it out there.

[mmschlk]

While yes not having write-access is a bit of an edge-case, the import does not necessarily have to create the directories. :) Lazily creating the directories should be fine. They are not very essential.

Thank you for pointing this out! :)

[mmschlk]

@glennkroegel, I updated the import of the datasets in #327. With this at least the initial import should be safe. :)