code: def test_aggregate_stats_valid_json_return():
      file_name = "test_aggregate_stats_json_return.json"
      enable_profiler(file_name, True, True, True)
      test_profile_event(False)
      debug_str = profiler.dumps(format="json")
      assert len(debug_str) > 0
      target_dict = json.loads(debug_str)
      assert (
          "Memory" in target_dict
          and "Time" in target_dict
          and "Unit" in target_dict
      )
      profiler.set_state("stop")
  
imports: from __future__ import print_function
  import time
  import os
  import csv
  import json
  import numpy
  from collections import OrderedDict
  import mxnet
  from mxnet import profiler
  from mxnet.gluon import nn
  from mxnet.test_utils import is_cd_run
  from common import run_in_spawned_process
  import pytest
label_desc: Use image node_id 11 for calling a global function with example usage: test_aggregate_stats_valid_json_return() without return types