Change subsets for _subsets

src/ptbench/scripts/dataset.py

@@ -179,7 +179,7 @@ def check(dataset, limit):
                 logger.info(f"Checking protocol {protocol}")
 
                 errors += check_database_split_loading(
-                    database_split.subsets, raw_data_loader, limit=limit
+                    database_split._subsets, raw_data_loader, limit=limit
                 )
 
         if not errors: