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retrieve alpha from a backtest conveniently

From the backtest view, it seems I cannot easily locate alpha or make a comparison with benchmark sharpe ratio. There is the notebook section, but running

bt = get_backtest('5b68f6eaa81f9c43df34be1a')
bt.create_full_tear_sheet()

usually (70% of the time) lags and not responding after it says 100%. I have to tried a lot of time in order to obtain the alpha (the only way i know of is to get backtest and bt.create_full_tear_sheet, i think there should be some easier way.). And for some strategy, I finish the back test but the bt.create_full_tear_sheet() always fail (I have tried multiple times...). how do I conveniently obtain alpha or compare with bench mark sharpe ratio? Thank you.