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PCA
K-means clustering
Gradient descent
None of the above
Regularization
Lasso regression
Data cleaning and preprocessing
Model selection and training
Hyperparameter tuning
Feature engineering
One-hot encoding
Standardization
Increasing model complexity
Decreasing the amount of training data
Adding more features to the model
Grid search
Lasso regularization
To split the data into training and test sets
To perform cross-validation on the data
To perform hyperparameter tuning on the model
To test the performance of the model on unseen data
To create a validation set for hyperparameter tuning
To reduce overfitting of the model
All of the above
Linear regression
K-nearest neighbors