Update vox_celeb.py

vox_celeb.py

@@ -116,9 +116,9 @@ def format_urls(urls_dict, cred_key):
         if isinstance(value, dict):
             formatted_urls[key] = format_urls(value, cred_key)
         elif isinstance(value, tuple):
-            formatted_urls[key] = tuple([url.format(_CRED_KEY=cred_key) for url in value])
+            formatted_urls[key] = tuple([url.format(cred_key=cred_key) for url in value])
         else:
-            formatted_urls[key] = value.format(_CRED_KEY=cred_key)
+            formatted_urls[key] = value.format(cred_key=cred_key)
 
     return formatted_urls