For testing, there’s a whole slew of ranking-based metrics you can use. You want to make sure the content being retrieved is actually relevant. Offline precisio

For testing, there’s a whole slew of ranking-based metrics you can use. You want to make sure the content being retrieved is actually relevant. Offline precision, recall, nDCG and MRR tend to be pretty good. Online you can just directly measure user behavior as a function of your model’s inputs and outputs. https://en.m.wikipedia.org/wiki/Evaluation_measures_(information_retrieval) https://en.m.wikipedia.org/wiki/Evaluation_measures_(informa...