remove import plot from ot/__init__.py

[Slasnista]

Hello,

Would it be possible to remove line 19 from . import plot from ot/init.py ?

It automatically loads matplotlib which could generates an error when using an instance without graphical display.

Thanks in advance !

[agramfort]

that's exactly why sklearn has no hard dependency on matplotlib

[rflamary]

Agreed,

@Slasnista feel free to do a PR with the working tests and updated examples (some of them require ot.plot).

[rflamary]

Issue has been fixed in PR #41