Hi Konstantinos.
There is an IRC channel but it's not that busy any more.
You could try the gitter channel at
http://gitter.im/scikit-learn/scikit-learn
The issue that you cited is ok, but this one might be easier to start with:
https://github.com/scikit-learn/scikit-learn/issues/8194
You need
Hello all,
My name is Konstantinos and I would like to contribute to scikit-learn.
I am relatively new to open source development and I want to work on
some easy bug-fixing to get used to the github workflow.
Firstly, is this issue open and should I try working on it?
https://github.com/scik
