General: http://shuaizhang.tech/2017/03/15/Datasets-For-Recommender-System/
Movielens: https://grouplens.org/datasets/movielens/
Paper + Package: https://github.com/robi56/Deep-Learning-for-Recommendation-Systems
Paper + Code: https://handong1587.github.io/deep_learning/2015/10/09/recommendation-system.html
Summary of Deep Neural Networks for YouTube Recommendations: https://blog.acolyer.org/2016/09/19/deep-neural-networks-for-youtube-recommendations/
Code: https://github.com/ogerhsou/Youtube-Recommendation-Tensorflow/blob/master/youtube_recommendation.py