处理非平稳性
在本练习中,您将再次可视化模型分数的波动,不过这次的数据统计特性会随时间变化。
model 中存有一个线性回归模型对象实例,交叉验证对象在 cv 中,数据在 X 和 y 中。
本练习是课程的一部分
Python 中的时间序列机器学习
交互式实操练习
通过完成这段示例代码来试试这个练习。
# Pre-initialize window sizes
window_sizes = [25, 50, 75, 100]
# Create an empty DataFrame to collect the stores
all_scores = ____(index=times_scores)
# Generate scores for each split to see how the model performs over time
for window in window_sizes:
# Create cross-validation object using a limited lookback window
cv = ____(n_splits=100, max_train_size=window)
# Calculate scores across all CV splits and collect them in a DataFrame
this_scores = ____(____, ____, ____, cv=cv, scoring=my_pearsonr)
all_scores['Length {}'.format(window)] = this_scores