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I have recommender system based on some dataset. But what if i want to add new user to and predict for this user recommendation? Question based on this tutorial https://learn.microsoft.com/en-us/dotnet/machine-learning/tutorials/movie-recommendation

David Olejnik
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If you just want to predict, then no, you simply call CreatePredictionEngine passing in your user data

If you want to update your model with data for the new user, then you have to rebuild the model.

Matt Evans
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  • Is there simple way to rebuild the model (I mean retrain, not training from scratch)? – David Olejnik Oct 09 '19 at 13:30
  • Not in my experience, the full model gets built whenever you add new data. However I am not familiar with ML.Net, tbh. Is there a concern around how long retraining takes? If not, you can simply automate. – Matt Evans Oct 09 '19 at 13:43