message: Add broadcasting support for `tf.where`
diff: @@ -126,7 +126,7 @@ from tensorflow.python.ops.init_ops import convolutional_orthogonal_2d
  from tensorflow.python.ops.init_ops import convolutional_orthogonal_3d
  from tensorflow.python.util.all_util import remove_undocumented
  -_allowed_symbols = ['nest']
  +_allowed_symbols = ['nest', 'broadcast_to', 'where']
  _nest_allowed_symbols = [
  'assert_same_structure',
  'is_sequence',
  