How to use the yappi.clear_stats function in yappi

yappi.set_tag_callback(tag_cbk2)
        burn_io(0.1)
        yappi.stop()
        traces = yappi.get_func_stats()
        t1 = '''
        ..p/yappi/tests/utils.py:134 burn_io  2      0.000000  0.208146  0.104073
        '''
        self.assert_traces_almost_equal(t1, traces)

        tagged_traces = yappi.get_func_stats(filter={'tag': 2})
        t1 = '''
        ..p/yappi/tests/utils.py:134 burn_io  1      0.000000  0.105063  0.105063
        '''
        self.assert_traces_almost_equal(t1, tagged_traces)

        yappi.clear_stats()

def setUp(self):
        # reset everything back to default
        yappi.stop()
        yappi.clear_stats()
        yappi.set_clock_type('cpu')  # reset to default clock type
        yappi.set_context_id_callback(None)
        yappi.set_context_name_callback(None)
        yappi.set_tag_callback(None)

def test_no_stats_different_clock_type_load(self):

        def a():
            pass

        yappi.start()
        a()
        yappi.stop()
        yappi.get_func_stats().save("tests/ystats1.ys")
        yappi.clear_stats()
        yappi.set_clock_type("WALL")
        yappi.start()
        yappi.stop()
        stats = yappi.get_func_stats().add("tests/ystats1.ys")
        fsa = utils.find_stat_by_name(stats, 'a')
        self.assertTrue(fsa is not None)

yappi.set_tag_callback(tag_cbk2)
        burn_cpu(0.1)
        yappi.stop()
        traces = yappi.get_func_stats()
        t1 = '''
        ../yappi/tests/utils.py:125 burn_cpu  2      0.000000  0.200156  0.100078
        '''
        self.assert_traces_almost_equal(t1, traces)

        tagged_traces = yappi.get_func_stats(filter={'tag': 1})
        t1 = '''
        ../yappi/tests/utils.py:125 burn_cpu  1      0.000000  0.100062  0.100062
        '''
        self.assert_traces_almost_equal(t1, tagged_traces)

        yappi.clear_stats()

        # test wall
        yappi.set_clock_type("wall")
        yappi.set_tag_callback(tag_cbk)
        yappi.start()
        burn_io(0.1)
        yappi.set_tag_callback(tag_cbk2)
        burn_io(0.1)
        yappi.stop()
        traces = yappi.get_func_stats()
        t1 = '''
        ..p/yappi/tests/utils.py:134 burn_io  2      0.000000  0.208146  0.104073
        '''
        self.assert_traces_almost_equal(t1, traces)

        tagged_traces = yappi.get_func_stats(filter={'tag': 2})

def a():
            pass

        def b():
            pass

        yappi.start()
        t = threading.Thread(target=a)
        t.start()
        t.join()
        t = threading.Thread(target=b)
        t.start()
        t.join()
        yappi.get_func_stats().save("tests/ystats1.ys")
        yappi.clear_stats()
        _yappi._set_test_timings(timings)
        self.assertEqual(len(yappi.get_func_stats()), 0)
        self.assertEqual(len(yappi.get_thread_stats()), 1)
        t = threading.Thread(target=a)
        t.start()
        t.join()

        self.assertEqual(_yappi._get_start_flags()["profile_builtins"], 0)
        self.assertEqual(_yappi._get_start_flags()["profile_multithread"], 1)
        yappi.get_func_stats().save("tests/ystats2.ys")

        stats = yappi.YFuncStats([
            "tests/ystats1.ys",
            "tests/ystats2.ys",
        ])
        fsa = utils.find_stat_by_name(stats, "a")

asyncio.get_event_loop().run_until_complete(a())
        asyncio.get_event_loop().run_until_complete(a())
        yappi.stop()

        r1 = '''
        ..p/yappi/tests/test_asyncio.py:43 a  2      0.000118  1.604049  0.802024
        async_sleep                           6      0.000000  0.603239  0.100540
        ../yappi/tests/utils.py:126 burn_cpu  2      0.576313  0.600026  0.300013
        ..p/yappi/tests/utils.py:135 burn_io  4      0.000025  0.400666  0.100166
        time.sleep                            4      0.400641  0.400641  0.100160
        '''
        stats = yappi.get_func_stats()

        self.assert_traces_almost_equal(r1, stats)

        yappi.clear_stats()
        yappi.set_clock_type("cpu")
        yappi.start(builtins=True)
        asyncio.get_event_loop().run_until_complete(a())
        asyncio.get_event_loop().run_until_complete(a())
        yappi.stop()
        stats = yappi.get_func_stats()
        r1 = '''
        ..p/yappi/tests/test_asyncio.py:43 a  2      0.000117  0.601170  0.300585
        ../yappi/tests/utils.py:126 burn_cpu  2      0.000000  0.600047  0.300024
        async_sleep                           6      0.000159  0.000801  0.000134
        time.sleep                            4      0.000169  0.000169  0.000042
        '''
        self.assert_traces_almost_equal(r1, stats)

def clear_stats(self):
            yappi.clear_stats()
            return '<a href="stats">stats</a>'

def _startProfiling():
            logger.info("Activating new profiler")
            yappi.clear_stats()
            yappi.start()
            _updateMenuStatus()

def __exit__(self,*args):
		import yappi
		yappi.stop()
		yappi.print_stats()
		yappi.clear_stats()