Fix strip whitespace filter (#2048)

* batch commit

* :Revert "batch commit"

This reverts commit d859d1ca.

* batch commit

* checkout from main

* checkout from main

* checkout from main

* checkout from main

* checkout from main

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

* cleanup

lm_eval/filters/extraction.py

@@ -62,11 +62,8 @@ class WhitespaceFilter(Filter):
         def filter_set(inst):
             filtered_resp = []
             for resp in inst:
-                if resp.startswith(" "):
-                    resp = resp[1:]
-
+                resp = resp.lstrip()
                 filtered_resp.append(resp)
-
             return filtered_resp
 
         filtered_resps = [filter_set(resp) for resp in resps]