statsmodels.tsa.arima_model.ARMA and statsmodels.tsa.arima_model.ARIMA have been removed in favor of

这种使用方法已经弃用了,改成下面即可

import statsmodels.api as sm
model = sm.tsa.arima.ARIMA(train_data, order=(1,1,1))
result = model.fit()

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