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ivyisabelle · 2020年01月06日

问一道题:NO.PZ201512020300000506

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问题如下:

Comparing two ML models that could be used to accomplish Step 3, which statement(s) best describe(s) the advantages of using Classification and Regression Trees (CART) instead of K-Nearest Neighbor (KNN)?

Statement I For CART there is no requirement to specify an initial hyperparameter (like K)

Statement II For CART there is no requirement to specify a similarity (or distance) measure

Statement III For CART the output provides a visual explanation for the prediction

选项:

A.

Statement I only

B.

Statement III only

C.

Statements I, II and III

解释:

C is correct. The advantages of using CART over KNN to classify companies into two categories (“not acquisition target” and “acquisition target”), include all of the following: For CART there are no requirements to specify an initial hyperparameter (like K) or a similarity (or distance) measure as with KNN, and CART provides a visual explanation for the prediction (i.e., the feature variables and their cut-off values at each node).
A is incorrect, because CART provides all of the advantages indicated in Statements I, II and III.

B is incorrect, because CART provides all of the advantages indicated in Statements I, II and III.

CART法不是为了防止overfitting的问题,可以有两种方法,一种是事前设定regularization parameters,还有一种是事后pruning。第一种不就是事前先设参数吗?为什么这个题说,事前不用设hyperparameter?

1 个答案

星星_品职助教 · 2020年01月06日

同学你好,

设置超参数并不是CART必须的前提条件,没有超参数也可以做CART。只是像你说的那样,CART是有可能导致过度拟合的。这个时候可以选择的解决方案之一才是加超参数,并不是没了这一步就没法用算法了。

利利群群 · 2021年03月01日

这都可以啊,超参的条件有些是必要的,有些是不必要的

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NO.PZ201512020300000506 Statement I only Statement III only Statements I, II anIII C is correct. The aantages of using CART over KNN to classify companies into two categories (“not acquisition target” an“acquisition target”), inclu all of the following: For CART there are no requirements to specify initihyperparameter (like K) or a similarity (or stance) measure with KNN, anCART provis a visuexplanation for the prection (i.e., the feature variables antheir cut-off values eano). A is incorrect, because CART provis all of the aantages incatein Statements I, II anIII. B is incorrect, because CART provis all of the aantages incatein Statements I, II anIII. 老师好, 这道题statement I我是纠结了一下,因为对CART来说,可以设定一些超参数,也可以不用。所以我没判断出来到底是对是错。然后就去看了StatementII这个结论。 在StatementII里面,它说CART没有对similarity和stance的设定,我就在想,咱们CART里的root no和cision no,不都是用的是similarity吗?比如\"ROE>10?\"作为一个no下面有两个分支。其实在我看来就是一种similarity的设定。我是哪里又理解错了吗? (总感觉我和出题人的思路总是不一样,哎><) 谢谢老师

2021-05-22 14:31 1 · 回答

NO.PZ201512020300000506 Statement I only Statement III only Statements I, II anIII C is correct. The aantages of using CART over KNN to classify companies into two categories (“not acquisition target” an“acquisition target”), inclu all of the following: For CART there are no requirements to specify initihyperparameter (like K) or a similarity (or stance) measure with KNN, anCART provis a visuexplanation for the prection (i.e., the feature variables antheir cut-off values eano). A is incorrect, because CART provis all of the aantages incatein Statements I, II anIII. B is incorrect, because CART provis all of the aantages incatein Statements I, II anIII. 为什么称其为cart对比的优点

2021-03-17 15:16 2 · 回答