code: def test_0_initialize(self):
      num = 0
      for model_class in all_model_classes:
          if model_class is not None:
              model = model_class()
              num += 1
      print(
          "There are {:}/{:} valid models in total.".format(
              num, len(all_model_classes)
          )
      )
  
imports: import unittest
  from qlib.contrib.model import all_model_classes
label_desc: Use image node_id 1 for calling the TestAllFlow obj's underlying member method code with example usage: obj.test_0_initialize() without return types