Fix nltk import failing (#1013)

Author: clefourrier

src/lighteval/tasks/extended/ifeval/instructions_utils.py

@@ -28,6 +28,11 @@ def download_nltk_resources():
     except LookupError:
         nltk.download("punkt")
 
+    try:
+        nltk.data.find("tokenizers/punkt_tab")
+    except LookupError:
+        nltk.download("punkt_tab")
+
 
 download_nltk_resources()