Collaborative filtering Deep learning parts

Hi All,

I’m new to DNN this is my first course. I have the following questions on collaborative filtering from notebook 8.

  1. I think it has two approaches

    a). The first part is based on a matrix approach, nothing related to DNN
    b). The second part starting from “Deep learning for Collaborative filter” applies the DNN


2). For the DNN part from the option b, what is the DNN type? like is it a sequential model, RNN, or CNN?