Machine Learning Intermediate Quiz 5
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Intermediate Quiz 5
1. Which of these is a drawback of k-Nearest Neighbors?
Slow prediction for large datasets
Requires labeled data
Cannot handle missing values
2. What is the main goal of model regularization?
Prevent overfitting
Increase training speed
Reduce data size
3. Which of these is a common loss function for classification?
Cross-Entropy Loss
Mean Squared Error
Silhouette Score
4. What is the main difference between L1 and L2 regularization?
L1 can set some weights to zero; L2 cannot
L2 can set some weights to zero; L1 cannot
They are the same
5. Which method is used for hyperparameter tuning?
Random Search
Feature Extraction
Clustering
6. What does "stratified sampling" ensure?
Each class is proportionally represented in the sample
All data is used for training
Features are normalized
7. Which of these is a limitation of decision trees?
Prone to overfitting
Cannot handle numerical data
Require feature scaling
8. What is the main purpose of using pipelines in scikit-learn?
Automate workflows and avoid data leakage
Increase model complexity
Reduce dataset size
9. Why is feature scaling important for distance-based algorithms like k-NN?
So that features with larger scales do not dominate the distance calculation
To increase the number of neighbors automatically
To remove all categorical features from the dataset
10. What is a validation curve typically used to analyze?
How training and validation scores change with a single hyperparameter
How model accuracy changes with different random seeds
How data size changes during preprocessing
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