code: def md5_checksum(filepath: str) -> str:
      """Calculate MD5 checksum hash for a given file.
  
      Code from example: https://stackoverflow.com/a/3431838/8734015.
  
      Args:
          filepath: file to calculate MD5 checksum.
  
      Returns:
          MD5 hash string.
  
      """
      hash_md5 = hashlib.md5()
      with open(filepath, "rb") as f:
          for chunk in iter(lambda: f.read(4096), b""):
              hash_md5.update(chunk)
      return hash_md5.hexdigest()
  
label_desc: Use image node_id 1 for calling a global function with example usage: md5_checksum(filepath) and returns: hash_md5