Rework the worker due to `Dataset` API changes

Closes #14 (closed), #16 (closed)

worker_generic_training_dataset/worker.py

@@ -382,7 +382,8 @@ class DatasetExtractor(DatasetWorker):
 
         dataset_sets: list[Set] = list(self.list_sets())
         datasets_and_sets: list[tuple[Dataset, list[Set]]] = [
-            groupby(dataset_sets, attrgetter("dataset.id"))
+            (dataset, list(sets))
+            for dataset, sets in groupby(dataset_sets, attrgetter("dataset"))
         ]
         if not datasets_and_sets:
             logger.warning("No datasets to process, stopping.")