message: Fix resize_volumes data_format
diff: @@ -1353,11 +1353,11 @@ def resize_images(x, height_factor, width_factor, data_format, interpolation='ne
  @_log_call
  def resize_volumes(x, depth_factor, height_factor, width_factor, data_format):
  data_format = _normalize_data_format(data_format)
  - if data_format == 'ncx':
  + if data_format == plaidml_op.TensorLayout.NCX:
  ret = repeat_elements(x, depth_factor, axis=2)
  ret = repeat_elements(ret, height_factor, axis=3)
  ret = repeat_elements(ret, width_factor, axis=4)
  - elif data_format == 'nxc':
  + elif data_format == plaidml_op.TensorLayout.NXC:
  ret = repeat_elements(x, depth_factor, axis=1)
  ret = repeat_elements(ret, height_factor, axis=2)
  ret = repeat_elements(ret, width_factor, axis=3)
  