Adding training sets

opusparcus.py

@@ -181,6 +181,8 @@ class Opusparcus(datasets.GeneratorBasedBuilder):
                 )
             )
 
+        return splits
+
     def _generate_examples(
             self, lang, quality, filepath, split  # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
     ):