fixes

Author: czaloom

src/valor_lite/common/persistent.py

@@ -40,7 +40,7 @@ def batch_size(self) -> int:
         return self._batch_size
 
     @property
-    def rows_per_files(self) -> int:
+    def rows_per_file(self) -> int:
         return self._rows_per_file
 
     @property

src/valor_lite/object_detection/loader.py

@@ -485,7 +485,7 @@ def rank(
         detailed_reader = self._detailed_writer.to_reader()
         subset_columns = [
             field.name
-            for field in self._ranked_writer._schema
+            for field in self._ranked_writer.schema
             if field.name not in {"high_score", "iou_prev"}
         ]
         if (