code: def pop(self, key, default=None):
      if self.tracker:
          value = super().pop(key, default)
          if value is not default:
              self.tracker.untrack(value)
          return value
      else:
          return super().pop(key, default)
  
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 4 for calling the TrackedDict obj's underlying member method code with example usage: obj.pop(key, default) and returns: value, super