docstr: The set of vertex type names
code: def vertex_types(self):
      """The set of vertex type names"""
      return set(self.__client.get_graph_vertex_types(self.__graph_id))
  
imports: import numpy
  import importlib
  from cugraph_service_client.exceptions import CugraphServiceError
  from cugraph_service_client.remote_graph_utils import _transform_to_backend_dtype, _transform_to_backend_dtype_1d, _offsets_to_backend_dtype, MissingModule
label_desc: Use image node_id 22 for calling the RemoteGraph obj's underlying member method code with example usage: obj.vertex_types() and returns: set