code: def execute(self):
      if self._name in self._tpu_map:
          tpu_dict = self._tpu_map[self._name].copy()
          if isinstance(tpu_dict.get("health"), list):
              # Do extraction of health list to a single health string based on time.
              time_now = time.time()
              health_now = tpu_dict.get("health")[time_now]
              tpu_dict["health"] = health_now
          return tpu_dict
      else:
          raise KeyError("Resource %s was not found" % self._name)
  
imports: import datetime
  import json
  import os
  import time
  import urllib
  from absl import flags
  from tensorflow.python.platform import test
  from tensorflow.python.tpu.client import client
label_desc: Use image node_id 2 for calling the MockRequestClass obj's underlying member method code with example usage: obj.execute() and returns: tpu_dict