Talking about collaborative filtering, I’ve created a small post when was watching the previous version of the course. The code from the post is written in PyTorch but probably could be interesting for someone who wants to dig deeper into the topic.
One of the gists from the post that shows writing of a small custom nn.Module with embeddings:
Update 1: Not sure why the link to Medium is not rendered properly, here is a plain address:
https://medium.com/@iliazaitsev/how-to-implement-a-recommendation-system-with-deep-learning-and-pytorch-2d40476590f9
Otherwise, you probably could find it via @iliazaitsev username on Medium.
Update 2: Ok, Medium support responded that my account was blocked automatically by their spam filter. Probably they need try some Deep Learning methods to reduce the number of false positives 