Implement MMR recommender
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@aisa6148 is already working on this.
Since Aug 6, 2025.
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- Python
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Description
We should implement a maximum marginal relevance recommender, in part to make it available, and in part so that an out-of-the-box LensKit component violates the assumption that filtering recommendation lists is the same as excluding items from the candidate set.
This should be done after #180, so we have general-purpose similarity constructs to use as the basis for MMR.
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