Update casum.py

casum.py

@@ -59,8 +59,8 @@ class CaSum(datasets.GeneratorBasedBuilder):
     def _split_generators(self, dl_manager):
         """Returns SplitGenerators."""
         urls_to_download = {
-            "train": f"{_URL}{_TRAIN_FILE}"
-            "valid": f"{_URL}{_VALID_FILE}"
+            "train": f"{_URL}{_TRAIN_FILE}",
+            "valid": f"{_URL}{_VALID_FILE}",
             "test": f"{_URL}{_TEST_FILE}"
         }
         downloaded_files = dl_manager.download_and_extract(urls_to_download)