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</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)</p> Signup and view all the answers

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

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

    What distinguishes supervised learning from unsupervised learning?

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

    Which type of learning is computationally more complex?

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

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

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

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

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

    What characteristic makes supervised learning more accurate than unsupervised learning?

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

    What is the primary goal of unsupervised learning?

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

    What is a disadvantage of unsupervised learning?

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

    Which of the following is an example of unsupervised learning?

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

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

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

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

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

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

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

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