Lecture 20 Quiz
What is the difference between an anomaly and and outlier?
All anomalies are outliers, but not vice versa
All outliers are anomalies, but not vice versa
Anomalies tend to focus on a particular type of irregularity in data, while outliers are just generally the most unlikely point
None of the above
Which elements on the handwritten digits were most likely to be judged as outliers under the Gaussian distribution?
The least frequently occurring digit
The digits with the thickest or thinest writing
The digits that were placed as far from the center of the image as possible
The most frequently occuring digits
Which is true of the Gaussian mixture model?
The EM algorithm can be applied whether the cluster labels for each point (the z terms) are observed or not
The Gaussian mixture model will assign the highest probability to the points in in the largest clusters.
The K-means algorithm can be used to initialize Gaussian mixture centers and covariances.
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