题目2661 · 机器学习
Why Time-Series CV Is About Information Availability, Not Calendar Purity
Why is the real principle in time-series CV 'never train on information from the future' rather than 'always use a particular fold geometry'?
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中文题目题目4388 · 机器学习
Before Reporting Best Score
A time-series tuning run says a very short lookback window wins, but recent live performance has deteriorated sharply. What should you inspect first before widening the search?
打开 →题目4370 · 机器学习
Nested CV Fit Count 5
A time-series hyperparameter sweep evaluates 8 settings on 6 expanding-window splits. If each setting is refit once per split, how many model fits are needed?
打开 →题目2669 · 机器学习
Why Purging and Embargo Solve Different Problems
Why is purging not the same thing as embargoing in time-series validation?
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