old_contents: from keras import backend as K
  
  # We import all keras backend functions here,
  # so that files in this repo can import both
  # core and contrib backend functions with a
  # single import statement.
  
  from keras.backend import *
  
  
  if K.backend() == 'theano':
      from .theano_backend import *
  elif K.backend() == 'tensorflow':
      from .tensorflow_backend import *
  elif K.backend() == 'cntk':
  	from .cntk_backend import *
  
new_contents: from keras import backend as K
  
  # We import all keras backend functions here,
  # so that files in this repo can import both
  # core and contrib backend functions with a
  # single import statement.
  
  from keras.backend import *
  
  
  if K.backend() == 'theano':
      from .theano_backend import *
  elif K.backend() == 'tensorflow':
      from .tensorflow_backend import *
  elif K.backend() == 'cntk':
      from .cntk_backend import *
  
subject: Fix PEP8 error