Matplotlib vs matplotlib base

[SylvainCorlay]

This is probably not critical for this tutorial, but I noticed that the current environment was pulling matplotlib instead of matplotlib-base which causes many more dependencies to be fetched such as qt.

This is probably due to matplotlib being a a second-order dependency of a rapidsai recipe, which should probably be fixed.

[bryevdv]

I didn't see MPL specified in any of the immediate cu* recipes, but Holoviews seems to specify in bare matplotlib in it's setup.py (which then drives the conda recipe requirements):

https://github.com/holoviz/holoviews/blob/master/setup.py

cc @philippjfr could this be changed for conda recipe? Do you want an issue?

[SylvainCorlay]

holoviews-feedstock looks fine

https://github.com/conda-forge/holoviews-feedstock/blob/master/recipe/meta.yaml

Will look at the dependency graph tomorrow.

[philippjfr]

There is an existing issue about this in HoloViews. The issue is that the default conda channel does not ship a python2 matplotlib-base so my initial attempt at switching to matplotlib-base was unsuccessful. We are way overdue dropping py2, but I'd love a workaround in the meantime.