July 2018
Beginner to intermediate
146 pages
3h 39m
English
Content preview from Hands-On Recommendation Systems with Python
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The metric
The metric is the numeric quantity based on which we rank movies. A movie is considered to be better than another movie if it has a higher metric score than the other movie. It is very important that we have a robust and a reliable metric to build our chart upon to ensure a good quality of recommendations.
The choice of a metric is arbitrary. One of the simplest metrics that can be used is the movie rating. However, this suffers from a variety of disadvantages. In the first place, the movie rating does not take the popularity of a movie into consideration. Therefore, a movie rated 9 by 100,000 users will be placed below a movie rated 9.5 by 100 users. This is not desirable as it is highly likely that a movie watched and rated only ...
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