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ValueError                                Traceback (most recent call last)
<ipython-input-5-49c49b99292b> in <module>()
     26 encoded_y = encoder.transform(y)
     27 
---> 28 y = np_utils.to_categorical(encoded_y)

/home/xxx/local/anaconda2/lib/python2.7/site-packages/keras/utils/np_utils.pyc in to_categorical(y, num_classes)
     20     y = np.array(y, dtype='int').ravel()
     21     if not num_classes:
---> 22         num_classes = np.max(y) + 1
     23     n = y.shape[0]
     24     categorical = np.zeros((n, num_classes))

/home/xxx/local/anaconda2/lib/python2.7/site-packages/numpy/core/fromnumeric.pyc in amax(a, axis, out, keepdims)
   2250 
   2251     return _methods._amax(a, axis=axis,
-> 2252                           out=out, **kwargs)
   2253 
   2254 

/home/xxx/local/anaconda2/lib/python2.7/site-packages/numpy/core/_methods.pyc in _amax(a, axis, out, keepdims)
     24 # small reductions
     25 def _amax(a, axis=None, out=None, keepdims=False):
---> 26     return umr_maximum(a, axis, None, out, keepdims)
     27 
     28 def _amin(a, axis=None, out=None, keepdims=False):

ValueError: zero-size array to reduction operation maximum which has no identity