code: def not_(self, a):
      # Not is eager (not lazy)
      return fn._conditional.not_(a)
  
imports: from nvidia.dali import _autograph
  from nvidia.dali.data_node import DataNode
  from nvidia.dali import fn
  from nvidia.dali._autograph.utils import ag_logging
  from nvidia.dali._autograph.operators import variables
  from contextlib import contextmanager
  from enum import Enum
  import tree
label_desc: Use image node_id 6 for calling the DaliOperatorOverload obj's underlying member method code with example usage: obj.not_(a) and returns: fn