code: def __init__(self):
      self.counter = 0
  
file_path: BayesianOptimization/tests/test_observer.py
imports: from bayes_opt.bayesian_optimization import Observable
  from bayes_opt.observer import _Tracker
  from bayes_opt.event import Events
  import os
label_desc: Use image node_id 1 to create a new SimpleObserver object  with example: obj = SimpleObserver()