Hands-On Machine Learning with C++

Relevance of recommendations

In some cases, it is also essential to consider the freshness of the recommendation. This consideration is especially important for articles or posts on forums. Fresh entries should often get to the top. The correction factors (damping factors) are usually used to make such updates. The following formulas are used for calculating the rating of articles on media sites.

Here is an example of a rating calculation in the Hacker news magazine:

Here, U denotes upvotes, D denotes downvotes, P denotes penalty (additional adjustment for the implementation of other business rules), and T denotes recording time.

The following ...