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Machine Learning Practice · End Term · 24 Dec 2023 · September 2023 term · Set FDD1

Question 28: consider the below code : keep following symbols in mind…

Question 28

+3 marksOne or more correct options

consider the below code :

keep following symbols in mind:

  • >>>: Represents input code
  • # : Represents comment in a code
  • ... : Represents code continuation
  • Without any symbols at the beginning of a line then it is output of just above input line of code.
  • arrow pointing towards right is code continuation to another line.
python
>>> from sklearn.feature_selection import SelectKBest, chi2
>>> from sklearn.datasets import load_wine
>>> X,y = load_wine(return_X_y=True,as_frame=True)
>>> print(X.shape)
(178, 13)


>>> print(X.columns)
['alcohol', 'malic_acid', 'ash', 'alcalinity_of_ash', 'magnesium',
↪ 'total_phenols', 'flavanoids', 'nonflavanoid_phenols',
↪ 'proanthocyanins', 'color_intensity', 'hue',
↪ 'od280/od315_of_diluted_wines', 'proline']


>>> skb = SelectKBest(chi2, k=3)
>>> X_selected = skb.fit_transform(X, y)


>>> print(skb.scores_)
[5.44, 28.06, 0.74, 29.38, 45.02, 15.62, 63.33, 1.81, 9.36, 109.01, 5.18,
↪ 23.38, 16540.06]


>>> print(skb.pvalues_)
[6.56e-02, 8.03e-07, 0.68, 4.16e-07, 1.66e-10, 4.05e-04, 1.76e-14,  0.40,
↪ 9.24e-03, 2.12e-24, 0.074, 8.33e-06, 0]


>>> print(skb.pvalues_.argsort())
[12,  9,  6,  4,  3,  1, 11,  5,  8,  0, 10,  7,  2]

Which of the following feature(s) will be selected in X_selected from X ?

Select all that apply.

  1. A

    malic_acid

  2. B

    magnesium

  3. C

    flavanoids

  4. D

    proanthocyanins

  5. E

    color_intensity

  6. F

    proline

Show answer

Correct answers

  • C

    flavanoids

  • E

    color_intensity

  • F

    proline

See the whole paperTake it as a mock test

Question 28 of 38 in the IIT Madras BS Machine Learning Practice (MLP) End Term paper sat on 24 Dec 2023, in the September 2023 term (IIT M DIPLOMA FN EXAM FDD1 24 Dec 2023). It carries 3 marks.

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