I have issue with the first tutorial

[billchenxi]

The problem is from this: sep_color= (yn+1)/2.0; line, since it return's a array of list of list. And the pl.scatter() cannot accept array of list as parameter.

I unlisted the sep_color.

# Computing the colors for the points
from itertools import chain
sep_color = (yn+1)/2.0;
sep_color = list(chain(*sep_color))