Traceback (most recent call last):
  File "averaged_perceptron_observable_shogun.py", line 21, in <module>
    perceptron.train(features_train)
SystemError: [ERROR] In file /root/shogun/src/shogun/labels/BinaryLabels.cpp line 161: Cannot convert MulticlassLabels to binary labels: [ERROR] In file /root/shogun/src/shogun/labels/BinaryLabels.cpp line 154: Sorry, not yet implemented .