code: def ensure_directory_exists(self, filename):
      dirname = os.path.dirname(filename)
      if not os.path.exists(dirname):
          os.makedirs(dirname)
  
file_path: DeepSpeed/tests/model/Megatron_GPT2/test_common.py
imports: import unittest
  import subprocess
  import os
  import time
label_desc: Use image node_id 3 for calling the BaseTestCase obj's underlying member method code with example usage: obj.ensure_directory_exists(filename) without return types