message: [TF-numpy] Fixed einsum's signature to be Python2 compatible.
diff: @@ -1340,7 +1340,9 @@ def meshgrid(*xi, **kwargs):
  @np_utils.np_doc('einsum')
  -def einsum(subscripts, *operands, casting='safe', optimize=False): # pylint: disable=missing-docstring
  +def einsum(subscripts, *operands, **kwargs): # pylint: disable=missing-docstring
  + casting = kwargs.get('casting', 'safe')
  + optimize = kwargs.get('optimize', False)
  if casting == 'safe':
  operands = np_array_ops._promote_dtype(*operands) # pylint: disable=protected-access
  elif casting == 'no':
  