Re-instate challenge set

RiSAWOZ.py

@@ -298,6 +298,11 @@ class RiSAWOZ(datasets.GeneratorBasedBuilder):
                 # These kwargs will be passed to _generate_examples
                 gen_kwargs={"filepath": data_dir2["test"], "split": "test"},
             ),
+            datasets.SplitGenerator(
+                name="challenge",
+                # These kwargs will be passed to _generate_examples
+                gen_kwargs={"filepath": data_dir2["test"], "split": "challenge"},
+            ),
             datasets.SplitGenerator(
                 name=datasets.Split.VALIDATION,
                 # These kwargs will be passed to _generate_examples