什么时候使用交叉验证？
Cross-validation gives a more accurate measure of model quality, which is especially important if you are making a lot of modeling decisions. However, it can take longer to run, because it estimates multiple models (one for each fold).
So, given these tradeoffs, when should you use each approach?
-For small datasets, where extra computational burden isn't a big deal, you should run cross-validation.
-For larger datasets, a single validation set is sufficient. Your code will run faster, and you may have enough data that there's little need to re-use some of it for holdout.
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