Python recommendation toolkit

lenskit python recsys scikit
1 Open Issue Need Help Last updated: Jul 10, 2025

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AI Summary: Improve the warning mechanism in the LensKit Python recommendation toolkit's `ItemKNNScorer` (and potentially other components). The current warning for missing user history incorrectly triggers when a user is unknown in the training data. The task involves revising the warning logic to only trigger when a genuine history component is missing, possibly by checking if the query is a `RecQuery`.

Complexity: 3/5
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Python recommendation toolkit

Python
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