code: def process(input_dir, output_dir):
      for root, _dirs, names in os.walk(input_dir, followlinks=True):
          for name in names:
              if name.endswith(".csv"):
                  input_path = os.path.join(root, name)
                  df = pandas.read_csv(input_path)
                  output_name = name + ".pkl"
                  output_path = os.path.join(output_dir, output_name)
                  if not os.path.exists(output_dir):
                      os.makedirs(output_dir)
                  print(
                      "Converting %s to %s" % (input_path, output_path)
                  )
                  df.to_pickle(output_path)
  
label_desc: Use image node_id 1 for calling a global function with example usage: process(input_dir, output_dir) without return types