Which of the following is NOT a common type of machine learning?

• Supervised learning

• Unsupervised learning

• Reinforcement learning

• Statistical learning

Which of the following is an example of a regression problem?

• Classifying images of animals into different species

• Predicting the price of a house based on its features

• Identifying spam emails

• Recommending products to customers based on their purchase history

What is the purpose of a cost function in machine learning?

• To measure the accuracy of the model's predictions

• To optimize the model's parameters during training

• To prevent overfitting of the model to the training data

• To reduce the complexity of the model

Which of the following is a common method for evaluating the performance of a machine learning model?

• Cross-validation

• Gradient descent

• Feature engineering

• Regularization

What is the difference between a validation set and a test set in machine learning?

• A validation set is used to train the model, while a test set is used to evaluate its performance.

• A validation set is used to tune the hyperparameters of the model, while a test set is used to evaluate its final performance.

• A validation set is used to evaluate the model's generalization performance, while a test set is used to evaluate its training performance.

• There is no difference between a validation set and a test set.

Which of the following is an example of an ensemble learning technique?

• Linear regression

• Decision trees

• Naive Bayes classification

• Support vector machines (SVM)

What is the purpose of feature scaling in machine learning?

• To make the model more complex

• To reduce the size of the dataset

• To improve the accuracy of the model

• To normalize the features so they have similar ranges

Which of the following is an example of a clustering algorithm?

• Linear regression

• K-means

• Random forests

• Gradient boosting

Which of the following is an example of a kernel function used in SVMs?

• Sigmoid

• Rectified linear unit (ReLU)

• Softmax

• Cross-entropy

Which of the following is a disadvantage of using a decision tree algorithm?

• It is computationally expensive to train

• It can be prone to overfitting

• It requires a large amount of labeled data

• It is only suitable for binary classification problems