问题描述
我尝试从 sktime 包中拟合 ARIMA 模型。我导入一些数据集并将其转换为熊猫系列。然后我在训练样本上拟合模型,当我尝试预测错误发生时。
from sktime.forecasting.base import ForecastingHorizon
from sktime.forecasting.model_selection import temporal_train_test_split
from sktime.forecasting.arima import ARIMA
import numpy as np,pandas as pd
df = pd.read_csv('https://raw.githubusercontent.com/selva86/datasets/master/a10.csv',parse_dates=['date']).set_index('date').T.iloc[0]
p,d,q = 3,1,2
y_train,y_test = temporal_train_test_split(df,test_size=24)
model = ARIMA((p,q))
results = model.fit(y_train)
fh = ForecastingHorizon(y_test.index,is_relative=False,)
# the error is here !!
y_pred_vals,y_pred_int = results.predict(fh,return_pred_int=True)
错误信息如下:
ValueError: Invalid frequency. Please select a frequency that can be converted to a regular
`pd.Periodindex`. For other frequencies,basic arithmetic operation to compute durations
currently do not work reliably.
我在读取数据集时尝试使用 .asfreq("M")
,但是,该系列中的所有值都变成了 NaN
。
有趣的是,此代码适用于来自 load_airline
的默认 sktime.datasets
数据集,但不适用于我来自 github 的数据集。