Evaluating Recommender Systems

Metrics for evaluating Recommender Systems

Parth Chokhra
Jan 27 · 5 min read

Mean absolute error (MAE)

Mean Absolute Error

Root mean square error (RMSE)

Root mean square error

Hit rate

Hit Rate

Average reciprocal hit rate (ARHR)

The average reciprocal hit rate





We need to strike a balance between familiar, popular items and what we call the serendipitous discovery of new items the user has never heard of before. The familiar items establish trust with the user, and the new ones allow the user to discover entirely new things that they might love.

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