code: def test_get_latency(self):
      def test_func(count):
          time.sleep(0.001 * count)
  
      with pytest.raises(RuntimeError):
          Evaluator.get_latency(test_func, 5, num_running="10")
      with pytest.raises(RuntimeError):
          Evaluator.get_latency(test_func, 5, num_running=-10)
  
      latency_list = Evaluator.get_latency(test_func, 5)
      assert isinstance(latency_list, dict)
      for info in ["p50", "p90", "p95", "p99"]:
          assert info in latency_list
          assert isinstance(latency_list[info], float)
  
file_path: BigDL/python/chronos/test/bigdl/chronos/metric/test_forecast_metrics.py
imports: import numpy
  import pytest
  import time
  from unittest import TestCase
  from numpy.testing import assert_almost_equal
  from numpy.testing import assert_array_almost_equal
  from bigdl.chronos.metric.forecast_metrics import Evaluator
  from ..None import op_torch, op_tf2, op_distributed, op_diff_set_all
label_desc: Use image node_id 7 for calling the TestChronosForecastMetrics obj's underlying member method code with example usage: obj.test_get_latency() without return types