Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/Users/benjamin/Workspace/git/yellowbrick/yellowbrick/cluster/__init__.py", line 23, in <module>

from .elbow import *


 "/Users/benjamin/Workspace/git/yellowbrick/yellowbrick/cluster/elbow.py", line 33, in <module>

from sklearn.metrics import calinski_harabasz_score
ImportError: cannot import name 'calinski_harabasz_score'

Traceback (most recent call last):

 "<stdin>", line 5, in <module>

 "/usr/local/lib/python2.7/dist-packages/iptc/ip4tc.py", line 1323, in delete_rule
self.table.delete_entry(self.name, rbuf, rule.mask)

 "/usr/local/lib/python2.7/dist-packages/iptc/ip4tc.py", line 1348, in new
ret = fn(*args)

 "/usr/local/lib/python2.7/dist-packages/iptc/ip4tc.py", line 1588, in delete_entry
(chain, self.strerror()))iptc.ip4tc.IPTCError: can't delete entry from chain INPUT: Bad rule (does a matching rule exist in that chain?))