code: def main():
      cwd = os.getcwd()
      parent_dir = os.path.dirname(
          os.path.dirname(os.path.abspath(__file__))
      )
      log_path = os.path.join(parent_dir, "DBNet", "log.txt")
      try:
          print("Compiling DCN operators...")
          os.chdir(
              os.path.join(parent_dir, "DBNet", "assets", "ops", "dcn")
          )
          result = subprocess.run(
              "python setup.py build_ext --inplace",
              shell=True,
              capture_output=True,
          )
          if result.returncode == 0:
              os.chdir(os.path.join(parent_dir, "DBNet"))
              if validate_compilation(parent_dir, log_path, "cpu"):
                  result = subprocess.run(
                      "touch dcn_cpu_compiling_success",
                      shell=True,
                      capture_output=True,
                  )
              if validate_compilation(parent_dir, log_path, "cuda"):
                  result = subprocess.run(
                      "touch dcn_cuda_compiling_success",
                      shell=True,
                      capture_output=True,
                  )
          else:
              print(result.__dict__)
              print_error([result.stdout, result.stderr], log_path)
      except Exception as error:
          print_error("{}".format(error), log_path)
      finally:
          os.chdir(cwd)
  
imports: import os
  import glob
  from datetime import datetime
  import subprocess
label_desc: Use image node_id 4 for calling a global function with example usage: main() without return types