code: def _track_variable(self, variable):
      self._tracker.add_to_store("variables", variable)
  
imports: import re
  import warnings
  import numpy
  from keras import backend
  from keras import initializers
  from keras import ops
  from keras.optimizers.schedules import learning_rate_schedule
  from keras.saving import serialization_lib
  from keras.utils import tracking
  from keras.utils.naming import auto_name
label_desc: Use image node_id 2 for calling the BaseOptimizer obj's underlying member method code with example usage: obj._track_variable(variable) without return types