code: def _refresh_config(self):
      config_filename = os.path.join(self.working_dir, "config.tf.json")
      config = self._init_config()
      with open(config_filename, "w") as out:
          json.dump(config, out)
  
imports: import json
  import logging
  import os
  import re
  import subprocess
  import sys
  from guild import remote
  from guild import remote_util
  from guild import util
  from guild import var
  from .None import ssh
  from .None import ssh_util
label_desc: Use image node_id 18 for calling the EC2Remote obj's underlying member method code with example usage: obj._refresh_config() without return types