Week 13 — Unsupervised (11/14–18)#

In this week, we are going to talk more about unsupervised learning — learning without labels. We are not going to have time to investigate these techniques very deeply, but I want you to know about them, and you are experimenting with them in Assignment 6.

This week’s content is lighter, since we just had a large assignment and a midterm, and another assignment is due on Sunday.

🧐 Content Overview#

Element Length

🎥 No Supervision

2m51s

🎥 Decomposing Matrices

17m22s

🎥 Clustering

6m56s

🎥 Vectors and Spaces

7m27s

🎥 Information and Entropy

10m31s

This week has 0h45m of video and 0 words of assigned readings. This week’s videos are available in a Panopto folder.

📅 Deadlines#

🎥 No Supervision#

In this video, we review the idea of supervised learning and contrast it with unsupervised learning.

🎥 Decomposing Matrices#

This video introduces the idea of matrix decomposition, which we can use to reduce the dimensionality of data points.

Resources#

📓 Movie Decomposition#

The Movie Decomposition notebook demonstrates matrix decomposition with movie data.

🎥 Clustering#

This video introduces the concept of clustering, another useful unsupervised learning technique.

Resources#

📓 Clustering Example#

The clustering example notebook shows how to use the KMeans class.

🎥 Vector Spaces#

This video talks about vector spaces and transforms.

Resources#

🎥 Information and Entropy#

This video introduces the idea of entropy as a way to quantify information. It’s something I want to make sure you’ve seen at least once by the end of the class.

Resources#

🚩 Week 13 Quiz#

Take the Week 13 quiz on Canvas.

📓 Practice: SVD on Paper Abstracts#

The Week 13 Exercise notebook demonstrates latent semantic analysis on paper abstracts and has an exercise to classify text into new or old papers.

It requires the chi-papers.csv file, which is derived from the HCI Bibliography. It is the abstracts from papers published at the CHI conference (the primary conference for human-computer interaction) over a period of nearly 40 years.

If you want to see how to create this file, see the Fetch CHI Papers example.

📩 Assignment 6#

Assignment 6 is due November 20.