code: def setUp(self):
      _DummyTask.clear_instance_cache()
  
file_path: gokart/test/test_list_task_instance_parameter.py
imports: import unittest
  import luigi
  import gokart
  from gokart import TaskOnKart
label_desc: Use image node_id 1 for calling the ListTaskInstanceParameterTest obj's underlying member method code with example usage: obj.setUp() without return types