improving 'verb_form' to be the 'stem' form of the verb

qa_srl2018.py

@@ -178,7 +178,7 @@ class QaSrl2018(datasets.GeneratorBasedBuilder):
                             "predicate_idx": predicate_idx,
                             "predicate": predicate,
                             "is_verbal": True,
-                            "verb_form": predicate,
+                            "verb_form": verb_forms['stem'],
                             "question": question_slots_in_order,
                             "answers": answer_strs,
                             "answer_ranges": answer_spans