code: def handle(self, req, run):
      self._ensure_output(run)
      start = req.args.get("s", None, int)
      end = req.args.get("e", None, int)
      lines = self._output.read(start, end)
      return serving_util.json_resp(lines)
  
imports: import json
  import logging
  import math
  import os
  import socket
  import subprocess
  import sys
  import threading
  import time
  from werkzeug.exceptions import NotFound
  from werkzeug.utils import redirect
  from guild import serving_util
  from guild import util
  from guild import var
label_desc: Use image node_id 2 for calling the RunOutput obj's underlying member method code with example usage: obj.handle(req, run) and returns: serving_util