fix non-challenge splits

wsdmt.py

@@ -15,7 +15,7 @@ class WSDMTConfig(datasets.BuilderConfig):
 
         super().__init__(
             *args,
-            name=f"{corpus}{'#challenge' if challenge is not None else ''}@{lang1}-{lang2}@{variety}",
+            name=f"{corpus}{'#challenge' if challenge else ''}@{lang1}-{lang2}@{variety}",
             **kwargs,
         )
         self.lang1 = lang1
@@ -25,7 +25,7 @@ class WSDMTConfig(datasets.BuilderConfig):
         self.challenge = challenge
 
     def path_for(self, split, lang):
-        split_path = ('challenge/' if self.challenge is not None else '') + split
+        split_path = ('challenge/' if self.challenge else '') + split
         return f"data/{self.corpus}/{self.variety}/{split_path}/{lang}.jsonl.bz2"