题目4387 · 机器学习
Before Adding More Dimensions
Two hyperparameter settings differ in mean CV score by only 0.001, while the estimated standard error is 0.010. What is the first sensible interpretation?
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中文题目题目4390 · 机器学习
Before Blaming The Search
The current best setting sits at extreme values on both the learning-rate and regularization grids. What should your next search action be?
打开 →题目4389 · 机器学习
Before Choosing Nested CV
A categorical encoder was fit once on all rows and then reused inside cross-validation. What is the immediate correction?
打开 →题目4437 · 机器学习
Before Claiming Robustness
What should you inspect first before saying a walk-forward result is robust?
打开 →题目4439 · 机器学习
Before Comparing Models
Two models were validated under different walk-forward schemes. What is the first reason not to compare their average scores naively?
打开 →题目4436 · 机器学习
Before Designing Windows
What is the first thing you should map before choosing train, test, and embargo lengths in financial walk-forward validation?
打开 →题目4440 · 机器学习
Before Refitting More Often
What should you check first before increasing refit frequency because recent performance dipped?
打开 →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4438 · 机器学习
Before Shortening Windows
Before shrinking both train and test windows to 'adapt faster,' what should you quantify first?
打开 →题目4386 · 机器学习
Before Tuning
Training AUC is very high but CV AUC is near chance. Before trying more hyperparameter values, what is the first diagnostic step?
打开 →题目4418 · 机器学习
Embargo Budget Across Folds 3
A walk-forward backtest produces 7 complete folds, and the research protocol inserts a 3-day embargo between each training block and its following test block. How many calendar days are lost to embargo across the whole run?
打开 →题目811 · 脑筋急转弯
Mixed-Outcome Signature Slack 1
A diagnostic protocol has answer slots with outcome counts [2, 2, 3]. If it must encode exactly 11 hidden states, how many answer signatures remain unused under a perfect injective assignment?
打开 →题目815 · 脑筋急转弯
Mixed-Outcome Signature Slack 5
A diagnostic protocol has answer slots with outcome counts [2, 2, 2, 3]. If it must encode exactly 19 hidden states, how many answer signatures remain unused under a perfect injective assignment?
打开 →题目821 · 脑筋急转弯
Signature Feasibility Check 1
A protocol has answer slots with outcome counts [2, 2, 2]. Can it encode 9 hidden states injectively?
打开 →题目823 · 脑筋急转弯
Signature Feasibility Check 3
A protocol has answer slots with outcome counts [3, 3]. Can it encode 8 hidden states injectively?
打开 →题目4429 · 机器学习
Walk-Forward Is Not Magic
Why does a clean walk-forward protocol still not guarantee that a strategy will survive live trading?
打开 →题目082 · 概率
The Sleeping Beauty Problem
Sleeping Beauty participates in the following experiment. On Sunday she is put to sleep. A fair coin is flipped. If it lands Heads, she is woken on Monday only. If it lands Tails, she is woken on Monday and again on Tuesday (with her memory of the Monday awakening erased before T
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