code: def pop(self, index=-1):
      if self.tracker:
          value = self[index]
          self.tracker.untrack(value)
          return super().pop(index)
      else:
          return super().pop(index)
  
imports: from functools import wraps
  from keras.backend.common.global_state import get_global_attribute
  from keras.backend.common.global_state import set_global_attribute
  from keras.utils import python_utils
label_desc: Use image node_id 6 for calling the TrackedList obj's underlying member method code with example usage: obj.pop(index) and returns: super, super