COSC-E4 CS Elective 4: Machine Learning Lesson 3 - Unsupervised Learning
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Questions and Answers

What is the Euclidean distance between the point (168, 60) and Cluster 2?

  • $14.14214$
  • $4.472$ (correct)
  • $20.808$
  • $7.211103$

What are the new coordinates of the cluster centroid for Cluster 2 after updating it?

  • (169, 58) (correct)
  • (179, 68)
  • (182, 70)
  • (185, 72)

What is the Euclidean distance between the point (179, 68) and Cluster 1?

  • $14.14214$
  • $52$
  • $7.211103$ (correct)
  • $200$

Which cluster is the point (179, 68) assigned to?

<p>Cluster 1 (A)</p> Signup and view all the answers

What are the new coordinates of the cluster centroid for Cluster 1 after updating it?

<p>(182, 70) (A)</p> Signup and view all the answers

What is the Euclidean distance between the point (182, 72) and Cluster 1?

<p>$2$ (B)</p> Signup and view all the answers

What distinguishes supervised learning from unsupervised learning?

<p>Use of labeled data (A)</p> Signup and view all the answers

Which type of learning is computationally more complex?

<p>Unsupervised learning (C)</p> Signup and view all the answers

What is the main task of clustering in unsupervised learning?

<p>Dividing data points into groups based on similarity (C)</p> Signup and view all the answers

Which algorithm partitions observations into clusters based on the nearest mean?

<p>K-Means clustering algorithm (D)</p> Signup and view all the answers

What method does K-Means algorithm use for distance calculation?

<p>Euclidean method (D)</p> Signup and view all the answers

What characteristic makes supervised learning more accurate than unsupervised learning?

<p>Use of labeled data (D)</p> Signup and view all the answers

What is the primary goal of unsupervised learning?

<p>To learn patterns and structures from unlabeled data (B)</p> Signup and view all the answers

Which of the following is an advantage of unsupervised learning?

<p>It minimizes the opportunity for human error (A)</p> Signup and view all the answers

What is a disadvantage of unsupervised learning?

<p>It does not consider spatial relationships in the data (A)</p> Signup and view all the answers

Which of the following is an example of unsupervised learning?

<p>Clustering algorithms (B)</p> Signup and view all the answers

In the context of unsupervised learning, what does 'unlabeled data' refer to?

<p>Data without any associated target variables (A)</p> Signup and view all the answers

Which of the following statements best describes the relationship between supervised and unsupervised learning?

<p>They are two distinct paradigms of machine learning (A)</p> Signup and view all the answers

What is the minimum number of points required for a point to be considered a Core Point in the Density-Based Clustering algorithm?

<p>3 (C)</p> Signup and view all the answers

What is the value of the $\epsilon$ parameter used in the Density-Based Clustering algorithm described in the text?

<p>1 cm (D)</p> Signup and view all the answers

What is the first step in the Density-Based Clustering algorithm described in the text?

<p>Pick a random point that has not yet been assigned to a cluster or designated as an Outlier (B)</p> Signup and view all the answers

What is done if a point is determined to not be a Core Point in the Density-Based Clustering algorithm?

<p>The point is labeled as an Outlier (A)</p> Signup and view all the answers

What is done once a Core Point has been found in the Density-Based Clustering algorithm?

<p>All directly reachable points are added to the cluster (B)</p> Signup and view all the answers

What is done if an Outlier is added to a cluster in the Density-Based Clustering algorithm?

<p>The Outlier is labeled as a border point (B)</p> Signup and view all the answers

What is the Euclidean distance between the point (182, 72) and the cluster centroid (169, 58) in the initial iteration?

<p>$\sqrt{169 + 196} = 19.10$ (D)</p> Signup and view all the answers

After assigning the point (188, 77) to Cluster 1, what are the new centroid coordinates for Cluster 1?

<p>(185, 74) (C)</p> Signup and view all the answers

Which of the following points is assigned to Cluster 2 in the final assignment?

<p>(170, 56) (B)</p> Signup and view all the answers

What is the Euclidean distance between the point (188, 77) and Cluster 2 centroid (169, 58)?

<p>$\sqrt{361 + 361} = 26.87$ (A)</p> Signup and view all the answers

Which of the following statements best describes density-based clustering methods?

<p>They consider clusters as dense regions with some similarities and differences from lower-density regions. (A)</p> Signup and view all the answers

What is the Euclidean distance between the point (188, 77) and Cluster 1 centroid (182, 71)?

<p>$\sqrt{36 + 36} = 8.49$ (B)</p> Signup and view all the answers

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