strange bug in Travis related to network2 (??)
remove not used imports
@@ -11,7 +11,7 @@ import numpy as npy
from numpy import fft
import matplotlib.pyplot as plb
-from IPython.display import Image, SVG, Math
+from IPython.display import Image
from IPython.core.pylabtools import print_figure
from abc import ABCMeta, abstractmethod
