Evaluating Recommendation engines What is the standard way for evaluating and comparing different algorithms while developing recommendation system? Whether we need to have a predetermined annotated ranked dataset and then compare with precision/recall/F measure of  different algorithms ? Is this the best way for evaluation ? Or is there any other way to compare results of various recommendation algorithms ?
The standard way to evaluate a recommendation engine is by using the RMSE (root mean square error) of the predicted values and the ground truth.

It is almost a SOP that, after finishing developing a recommendation engine, we will evaluate this engine by comparing its RMSE with other famous, common recommendation algorithms like SVD, tranditional CF, even RBM, etc.

Some terms mentioned above do not seem to be related with recommendation, but you can easily find on the internet how these techniques can be used in this topic.