code: def restore(self, checkpoint_file):
      with open(checkpoint_file, "rb") as fin:
          self.model = pickle.load(fin)
      self.model_init = True
  
file_path: analytics-zoo/pyzoo/zoo/chronos/model/arima.py
imports: import os
  import pickle
  from pmdarima.arima import ARIMA
  from pmdarima.arima import ndiffs
  from pmdarima.arima import nsdiffs
  from zoo.orca.automl.metrics import Evaluator
  from zoo.orca.automl.model.abstract import BaseModel, ModelBuilder
label_desc: Use image node_id 7 for calling the ARIMAModel obj's underlying member method code with example usage: obj.restore(checkpoint_file) without return types