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小强爱英语 · 2023年06月06日

A为什么错?

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NO.PZ202208300200000402

问题如下:

In the report on suggested actions to increase the ALPHA model’s accuracy, the suggestion that is most appropriate is:

选项:

A.Suggestion 1.

B.Suggestion 2.

C.Suggestion 3.

解释:

Solution

B is correct. Using k-fold cross-validation will increase the overall robustness and accuracy of the underlying model in predicting actual events.

A is incorrect. Increasing the holdout sample, also known as the validation sample, implies reducing the number of records in the training set data, which will reduce the underlying accuracy of the model given that it already has a relatively low number of data records (≈7,000).

C is incorrect. Reducing the size of the training set would reduce the accuracy and precision of the model and increase the likelihood of overfitting to the training set.

请详细讲一下,为什么A是错的,增加那个交叉验证的样本不是会让整个模型会更准确吗?

1 个答案

袁园_品职助教 · 2023年06月08日

嗨,从没放弃的小努力你好:


因为总样本数是固定的,我们是把样本数分为三份,训练集、验证集、测试集。增加了验证样本数就会导致训练集里面的数据变少,训练出来的模型就会不准确,所以A选项是错误的。

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努力的时光都是限量版,加油!

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