Great book indeed -- they talk about Collaborative filtering mostly, which suffers from the cold-start problem. If you need to build a recommendation algorithm

Great book indeed -- they talk about Collaborative filtering mostly, which suffers from the cold-start problem. If you need to build a recommendation algorithm that uses expert-knowledge (numerical features) you could use a simple kNN algorithm. [1] and [2] are two libraries I've written for this purpose. [1] https://github.com/axiomzen/Alike https://github.com/axiomzen/Alike [2] https://github.com/axiomzen/Look-Alike https://github.com/axiomzen/Look-Alike