问backtesting.py绘图功能不工作

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BokehDeprecationWarning: Passing lists of formats for DatetimeTickFormatter scales was deprecated in Bokeh 3.0. Configure a single string format for each scale
C:\Users\paul_\AppData\Local\Programs\Python\Python310\lib\site-packages\bokeh\models\formatters.py:399: UserWarning: DatetimeFormatter scales now only accept a single format. Using the first prodvided: '%d %b'
  warnings.warn(f"DatetimeFormatter scales now only accept a single format. Using the first prodvided: {fmt[0]!r} ")
BokehDeprecationWarning: Passing lists of formats for DatetimeTickFormatter scales was deprecated in Bokeh 3.0. Configure a single string format for each scale
C:\Users\paul_\AppData\Local\Programs\Python\Python310\lib\site-packages\bokeh\models\formatters.py:399: UserWarning: DatetimeFormatter scales now only accept a single format. Using the first prodvided: '%m/%Y'
  warnings.warn(f"DatetimeFormatter scales now only accept a single format. Using the first prodvided: {fmt[0]!r} ")
GridPlot(id='p11925', ...)

import bokeh
import datetime
import pandas_ta as ta
import pandas as pd

from backtesting import Backtest
from backtesting import Strategy
from backtesting.lib import crossover
from backtesting.test import GOOG

class RsiOscillator(Strategy):

    upper_bound = 70
    lower_bound = 30
    rsi_window = 14

    # Do as much initial computation as possible
    def init(self):
        self.rsi = self.I(ta.rsi, pd.Series(self.data.Close), self.rsi_window)

    # Step through bars one by one
    # Note that multiple buys are a thing here
    def next(self):
        if crossover(self.rsi, self.upper_bound):
            self.position.close()
        elif crossover(self.lower_bound, self.rsi):
            self.buy()

bt = Backtest(GOOG, RsiOscillator, cash=10_000, commission=.002)
stats = bt.run()
bt.plot()