# Course talk:CPSC522/Collaborative Filtering

## Contents

Suggestions105:17, 26 April 2016
Feedback003:47, 21 April 2016
Discussion with your page100:49, 19 April 2016

## Suggestions

Hi Tanuj,

A nice page. It is perfect if you can give some explanation for your pseudo code and do some proof reading.

Bests,

Yu Yan

08:46, 21 April 2016

05:17, 26 April 2016

## Feedback

Hey Tanuj,

• At one point, you used ${\displaystyle q_{i}}$ and ${\displaystyle p_{u}}$ to describe the latent features, then changed it to ${\displaystyle f_{i}}$ and ${\displaystyle g_{u}}$.
• If the correct way is

${\displaystyle (\sum _{\in D}(r^{'}+b_{i}+c_{u}+(\sum _{\overline {s}}f_{ik}g_{ku})-r)^{2})+(\lambda (b_{i}^{2}+c_{u}^{2}+\sum _{k}(f_{ik}^{2}+g_{ku}^{2})))}$
Then where are the indices ${\displaystyle i}$ and ${\displaystyle u}$ for the second term coming from...? What is the outermost bracket supposed to mean?

• What are the differences now that you've made this change?
03:46, 21 April 2016

Nice page! Could you clearly summarize the difference between old version and new version (maybe you can rename them to be more clear)?

02:03, 21 April 2016