handle empty item lits

lenskit · Feb 6, 2025 · aa74eb6 · aa74eb6
1 parent 71a69e2
commit aa74eb6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lenskit-implicit/lenskit/implicit.py b/lenskit-implicit/lenskit/implicit.py
@@ -101,7 +101,7 @@ def __call__(self, query: QueryInput, items: ItemList) -> ItemList:
         if query.user_id is not None:
             user_num = self.users_.number(query.user_id, missing=None)
 
-        if user_num is None:
+        if user_num is None or not len(items):
             return ItemList(items, scores=np.nan)
 
         inos = items.numbers(vocabulary=self.items_, missing="negative")