Bump the version number for all tasks based on PerplexityTask

This is due to the change in the bits_per_byte calculation.

lm_eval/tasks/pile.py

@@ -10,7 +10,7 @@ from best_download import download_file
 
 
 class PilePerplexityTask(PerplexityTask, abc.ABC):
-    VERSION = 0
+    VERSION = 1
 
     PILE_SET_NAME = None
     VAL_PATH = 'data/pile/val.jsonl.zst'

lm_eval/tasks/wikitext.py

@@ -41,7 +41,7 @@ def wikitext_detokenizer(string):
 
 
 class WikiText(PerplexityTask):
-    VERSION = 0
+    VERSION = 1
 
     def download(self):
         if not os.path.exists('data/wikitext/wikitext-2-raw/wiki.valid.raw'):
@@ -87,4 +87,4 @@ class WikiText(PerplexityTask):
     
     def count_words(self, doc):
         # count number of words in *original doc before detokenization*
-        return len(re.split(r"\s+", doc))
\ No newline at end of file
+        return len(re.split(r"\s+", doc))