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过儿 · 2024年09月22日

前半句话没听懂

NO.PZ2015120204000050

问题如下:

Steele and Schultz discuss the importance of feature selection and feature engineering in ML model training. Steele tells Schultz:

“Appropriate feature selection is a key factor in minimizing model overfitting, whereas feature engineering tends to prevent model underfitting.”

Is Steele’s statement regarding the relationship between feature selection/feature engineering and model fit correct?

选项:

A.

Yes

B.

No, because she is incorrect with respect to feature selection.

C.

No, because she is incorrect with respect to feature engineering.

解释:

A is correct. A dataset with a small number of features may not carry all the characteristics that explain relationships between the target variable and the features. Conversely, a large number of features can complicate the model and
potentially distort patterns in the data due to low degrees of freedom, causing over
fitting. Therefore, appropriate feature selection is a key factor in minimizing such model overfitting. Feature engineering tends to prevent underfitting in the training of the model. New features, when engineered properly, can elevate the underlying data points that better explain the interactions of features. Thus, feature engineering can be critical to overcome underfitting.

为什么模型选择能降低过度拟合风险?

1 个答案

品职助教_七七 · 2024年09月24日

嗨,努力学习的PZer你好:


feature selection相当于删除一些冗余不需要的变量,使过于复杂的模型变得简化,从而降低overfitting。

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努力的时光都是限量版,加油!