class_docstr: Class which stores vertex and edge properties that can be used to construct
  Graphs from individual property selections and used later to annotate graph
  algorithm results with corresponding properties.
class_docstr_tok: ["Class","which","stores","vertex","and","edge","properties","that","can","be","used","to","construct","Graphs","from","individual","property","selections","and","used","later","to","annotate","graph","algorithm","results","with","corresponding","properties","."]
docstr: Series containing the set of edge type names
code: def edge_types(self):
      """
      Series containing the set of edge type names
      """
      value_counts = self._edge_type_value_counts
      if value_counts is None:
          return set()
      elif self.__series_type is cudf.Series:
          return set(value_counts.index.to_arrow().to_pylist())
      else:
          return set(value_counts.index)
  
imports: import cudf
  import numpy
  import cugraph
  from cugraph.utilities.utils import import_optional, MissingModule, create_list_series_from_2d_ar
  from typing import Union
label_desc: Use image node_id 7 for calling the EXPERIMENTAL__PropertyGraph obj's underlying member method code with example usage: obj.edge_types() and returns: set, set, set