code: def get_historical_data(nmr_problems):
      
      observations = np.tile(np.array([[10, 256, 202, 97]]), (nmr_problems, 1))
      nmr_tanks_ground_truth = np.ones((nmr_problems,)) * 276
      return observations, nmr_tanks_ground_truth
docs: Get the historical tank data.
  
      Args:
          nmr_problems (int): the number of problems
  
      Returns:
          tuple: (observations, nmr_tanks_ground_truth)