How to use the yfinance.utils.back_adjust function in yfinance

'Adj Close': quotes2['Adj Close'].last(),
                'Volume': quotes2['Volume'].sum()
            })
            try:
                quotes['Dividends'] = quotes2['Dividends'].max()
            except Exception:
                pass
            try:
                quotes['Stock Splits'] = quotes2['Dividends'].max()
            except Exception:
                pass

        if auto_adjust:
            quotes = utils.auto_adjust(quotes)
        elif back_adjust:
            quotes = utils.back_adjust(quotes)

        if rounding:
            quotes = _np.round(quotes, data[
                "chart"]["result"][0]["meta"]["priceHint"])
        quotes['Volume'] = quotes['Volume'].fillna(0).astype(_np.int64)

        quotes.dropna(inplace=True)

        # actions
        dividends, splits = utils.parse_actions(data["chart"]["result"][0], tz)

        # combine
        df = _pd.concat([quotes, dividends, splits], axis=1, sort=True)
        df["Dividends"].fillna(0, inplace=True)
        df["Stock Splits"].fillna(0, inplace=True)