code: def __init__(self):
      self._iterations = 0
  
      self._previous_max = None
      self._previous_max_params = None
  
      self._start_time = None
      self._previous_time = None
  
file_path: BayesianOptimization/bayes_opt/observer.py
imports: from datetime import datetime
  from .event import Events
label_desc: Use image node_id 1 to create a new _Tracker object from inherited base classes: object with example: obj = _Tracker()