code: def dbl_epsilon():
      """Approximates the machine epsilon value for doubles."""
      epsilon = 1.0
      while 1.0 + epsilon / 2.0 != 1.0:
          epsilon /= 2
      return epsilon
  
imports: from contextlib import contextmanager
  from collections.abc import MutableMapping
  from itertools import chain
  from warnings import warn
  import os
  import tempfile
label_desc: Use image node_id 9 for calling a global function with example usage: dbl_epsilon() and returns: epsilon