message: Changed scalar to atom
diff: @@ -19,9 +19,9 @@ This module can perform operations on nested structures. A nested structure is a
  Python sequence, tuple (including `namedtuple`), or dict that can contain
  further sequences, tuples, and dicts.
  -Structures are scalar, or tuple or dict or list of constructed scalars and/or
  -other tuples/lists, or a scalar object. Note, numpy arrays are considered
  -scalars.
  +Structures are atom, or tuple or dict or list of constructed atoms and/or
  +other tuples/lists, or an atom object. Note, numpy arrays are considered
  +atoms.
  attr.s decorated classes (http://www.attrs.org) are also supported, in the
  same way as `namedtuple`.
  @@ -264,7 +264,8 @@ def flatten(structure, expand_composites=False):
  running.
  Args:
  - structure: an arbitrarily nested structure.
  + structure: an arbitrarily nested structure. Note, numpy arrays are considered
  + atoms and are not flattened.
  expand_composites: If true, then composite tensors such as tf.SparseTensor
  and tf.RaggedTensor are expanded into their component tensors.
  