Machine Learning Basics in MATLAB

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What is the primary distinction between supervised and unsupervised learning?

The complexity of the problem
The type of data used to train the model (correct)
The type of algorithms used
The speed of the learning process

What is the primary goal of machine learning?

To create a predefined output
To learn from experience (correct)
To find a specific algorithm
To create a machine that thinks

What is the purpose of feature scaling in the classification workflow?

To remove missing values
To encode categorical variables
To prevent certain features from dominating others (correct)
To select relevant features

What is the main characteristic of unsupervised learning?

The algorithm finds hidden structure or patterns in the data on its own (D) Signup and view all the answers

What is the typical split ratio for training and testing sets in the classification workflow?

70-30 or 80-20 (D) Signup and view all the answers

What is the purpose of clustering in unsupervised learning?

To group similar data points together (B) Signup and view all the answers

What is the purpose of feature selection in the classification workflow?

To select relevant features that contribute the most to the classification task (B) Signup and view all the answers

What is the challenge of creating a similarity measure in machine learning?

It is complex to create a similarity measure as the number of features increases (A) Signup and view all the answers

What is the main consideration when choosing a classification algorithm?

The nature of the problem, dataset size, and computational resources (C) Signup and view all the answers

What is the purpose of data preprocessing in the classification workflow?

To handle missing values, scale features, and encode categorical variables (B) Signup and view all the answers

What is the purpose of dimensionality reduction in unsupervised learning?

To reduce the number of features in data (A) Signup and view all the answers

What is an example of an unsupervised learning algorithm?

K-means clustering (A) Signup and view all the answers

What is the purpose of setting the random number generator seed to 1 in the code?

To ensure the reproducibility of results (D) Signup and view all the answers

What is the purpose of the cvpartition function in the code?

To split the dataset into training and testing sets (B) Signup and view all the answers

What is the ratio of the dataset reserved for testing?

30% (B) Signup and view all the answers

What is the purpose of the fitcecoc function in the code?

To train a Support Vector Machine classifier (B) Signup and view all the answers

What is the purpose of one-hot encoding for labels in the code?

To convert categorical labels into numerical format (B) Signup and view all the answers

What is the purpose of the normalize function in the code?

To normalize the features in the dataset (C) Signup and view all the answers

What is the purpose of removing rows with NaN values from the imported table?

To avoid errors in the discretization process (D) Signup and view all the answers

What are the bin edges used to discretize the CombinedMPG variable?

0, 20, 30, 70 (C) Signup and view all the answers

What is the color assigned to observations with 'Low' combined MPG in the scatter plot?

Red (B) Signup and view all the answers

What is the variable that stores the discretized result of the CombinedMPG variable?

MPGClass (A) Signup and view all the answers

What is the purpose of creating a scatter plot in this exercise?

To visualize the relationship between CityMPG and HighwayMPG (B) Signup and view all the answers

What is the file that contains the fuel economy data for different car models?

fuelEconomy.txt (B) Signup and view all the answers

What is the purpose of the function findgroups in the given MATLAB program?

To group the variable NumCyl and prepare it for the splitapply function (B) Signup and view all the answers

What is the role of the splitapply function in the given MATLAB program?

To find the average CombinedMPG for each group of NumCyl (D) Signup and view all the answers

What is the purpose of the line 'a.XTickLabel = gVal;' in the given MATLAB program?

To set the x-axis tick labels to the group values of NumCyl (C) Signup and view all the answers

What is the color of the bars in the bar plot created by the given MATLAB program?

[0 0.31 0.42] (A) Signup and view all the answers

What is the purpose of the line 'f.Color = [0.81 0.87 0.9];' in the given MATLAB program?

To set the background color of the figure (C) Signup and view all the answers

What is the typical environment used to write and upload codes to Arduino?

Arduino IDE (A) Signup and view all the answers