message: Update nn_ops.py
  Removed bad-whitespaces
diff: @@ -5546,7 +5546,7 @@ def erosion2d(value, kernel, strides, rates, padding, name=None):
  Returns:
  A `Tensor`. Has the same type as `value`.
  - 4-D with shape `[batch, out_height, out_width, depth]`.
  + 4-D with shape `[batch, out_height, out_width, depth]`. )
  Raises:
  ValueError: If the `value` depth does not match `kernel`' shape, or if
  