class_docstr: Set of elements retaining the insertion order
  All new elements are appended to the end of the set.
class_docstr_tok: ["Set","of","elements","retaining","the","insertion","order","All","new","elements","are","appended","to","the","end","of","the","set","."]
code: def discard(self, key: X) -> None:
      del self._data[key]
  
imports: import os
  import site
  import glob
  import ctypes
  import time
  import inspect
  import warnings
  import itertools
  import contextlib
  import collections
  import typing
  import numpy
  from nevergrad.common import sphere
label_desc: Use image node_id 4 for calling the OrderedSet obj's underlying member method code with example usage: obj.discard(key) without return types