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PROFESSIONAL-MACHINE-LEARNING-ENGINEER · Question #163

PROFESSIONAL-MACHINE-LEARNING-ENGINEER Question #163: Real Exam Question with Answer & Explanation

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Submitted by akirajp· Apr 18, 2026Data processing and feature engineering

Question

You are developing an ML model using a dataset with categorical input variables. You have randomly split half of the data into training and test sets. After applying one-hot encoding on the categorical variables in the training set, you discover that one categorical variable is missing from the test set. What should you do?

Options

  • AUse sparse representation in the test set.
  • BRandomly redistribute the data, with 70% for the training set and 30% for the test set
  • CApply one-hot encoding on the categorical variables in the test data
  • DCollect more data representing all categories

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Topics

#Data preprocessing#Categorical variables#One-hot encoding#Training-test consistency
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