class_docstr: PaddleHub server
class_docstr_tok: ["PaddleHub","server"]
code: def _get_source_key(self, url: str):
      return "source_{}".format(utils.md5(url))
  
imports: import json
  import os
  import requests
  import threading
  import time
  import yaml
  from collections import OrderedDict
  from typing import List
  import paddle
  import paddlehub
  import paddlehub.config
  from paddlehub.config import cache_config
  from paddlehub.server import ServerSource, GitSource
  from paddlehub.utils import utils
label_desc: Use image node_id 3 for calling the HubServer obj's underlying member method code with example usage: obj._get_source_key(url) and returns: str