title: How to handle ImportError: cannot import name '_ellipsoid' Keras
body: <p>I am getting an error which says 
  ImportError: cannot import name '_ellipsoid' 
  while importing 
  "from keras.preprocessing.image import ImageDataGenerator ".
  Please help me to rectify this issue.
  I am using 
  keras version: 2.1.5
  python version: 3 </p>
  
  <p>Thanks in advance</p>