clean up regression notebook

[sanuj]

Removes a deprecated warning and three errors. This notebook has been saved for version 4 of ipython since i have that installed on my laptop.

@karlnapf I wanted to confirm whether version 4 is ok for shogun or should i stick to version 3 (that shogun uses currently) before I send anymore notebook related PRs.

[sanuj]

Got this error at 3 different places. The fix was to make c take an array whose length was equal to number of training points that were being plotted.

Also changed set_color_cycle to set_prop_cycle to fix the following deprecated warning.

/usr/local/lib/python2.7/dist-packages/matplotlib/cbook.py:137: MatplotlibDeprecationWarning: The set_color_cycle attribute was deprecated in version 1.5. Use set_prop_cycle instead.
  warnings.warn(message, mplDeprecation, stacklevel=1)

The notebook is rendered weirdly on Github. It looks fine when I run it locally.

[karlnapf]

@vigsterkr what ipython is on the buildbot?

[vigsterkr]

3.1.0

[karlnapf]

If we have the new version (which we should) I am up for merging this....

[karlnapf]

can update?

[vigsterkr]

yes, to which version?

[sanuj]

Info about latest IPython version.

[vigsterkr]

so we want 4.x?

[vigsterkr]

just upgraded to ipython (4.1.2), but we dont have buildbot so wont be able to test notebook related things until we dont resurrect buildbot

[karlnapf]

Nice thanks, I will merge