code: def replace_mar_file_with_dummy_mar_in_model_store(
      model_store=None, model_mar=None
  ):
      model_store = (
          model_store
          if (model_store != None)
          else os.path.join(test_utils.ROOT_DIR, "model_store")
      )
      if model_mar != None:
          myfilepath = os.path.join(model_store, model_mar)
          if os.path.exists(myfilepath):
              os.remove(myfilepath)
              with open(myfilepath, "w+") as f:
                  f.write("junk data")
  
imports: import platform
  import time
  import os
  import glob
  import requests
  import json
  import test_utils
label_desc: Use image node_id 3 for calling a global function with example usage: replace_mar_file_with_dummy_mar_in_model_store(model_store, model_mar) without return types