Update Recommender.rank() to support unknown item scores #283
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Description
Update
Recommender.rank()method to support models that can produce score for unknown items.This change is backward compatible. The current implementations of all models are not affected.
Related Issues
Checklist:
README.md(if you are adding a new model).examples/README.md(if you are adding a new example).datasets/README.md(if you are adding a new dataset).