message: improve tf.saved_model.loader.load exception
diff: @@ -311,7 +311,9 @@ class SavedModelLoader(object):
  RuntimeError: if no metagraphs were found with the associated tags.
  """
  found_match = False
  + available_tags = []
  for meta_graph_def in self._saved_model.meta_graphs:
  + available_tags.append(set(meta_graph_def.meta_info_def.tags))
  if set(meta_graph_def.meta_info_def.tags) == set(tags):
  meta_graph_def_to_load = meta_graph_def
  found_match = True
  @@ -322,6 +324,7 @@ class SavedModelLoader(object):
  "MetaGraphDef associated with tags " + str(tags).strip("[]") +
  " could not be found in SavedModel. To inspect available tag-sets in"
  " the SavedModel, please use the SavedModel CLI: `saved_model_cli`"
  + "\navailable_tags: " + str(available_tags)
  )
  return meta_graph_def_to_load
  