fix HPF

lenskit-hpf/lenskit/hpf.py

@@ -53,14 +53,17 @@ def train(self, data: Dataset, options: TrainingOptions = TrainingOptions()):
         if hasattr(self, "item_features_") and not options.retrain:
             return
 
-        log = data.interaction_matrix(format="pandas", field="rating")
+        log = data.interactions().pandas()
+        if "rating" not in log.columns:
+            log["rating"] = 1.0
+
         log = log.rename(
             columns={
                 "user_num": "UserId",
                 "item_num": "ItemId",
                 "rating": "Count",
             }
-        )
+        )[["UserId", "ItemId", "Count"]]
 
         hpf = hpfrec.HPF(self.config.features, reindex=False, **self.config.__pydantic_extra__)  # type: ignore
 

lenskit/lenskit/data/dataset.py

@@ -670,6 +670,10 @@ def is_interaction(self) -> bool:
         """
         return self.schema.interaction
 
+    @property
+    def attribute_names(self) -> list[str]:
+        return [c for c in self._table.column_names if c not in self._link_cols]
+
     def count(self):
         if "count" in self._table.column_names:
             raise NotImplementedError()