too nested for core test

Author: soluwalana

tests/collections/llm/gpt/data/test_core.py

@@ -36,7 +36,7 @@ def __init__(self):
         self.bos_id = 1
         self.space_sensitive = False
         self.tokenizer = MagicMock()
-        self.tokenizer.tokenizer.apply_chat_template = mock_llama_apply_chat_template
+        self.tokenizer.apply_chat_template = mock_llama_apply_chat_template
 
     def text_to_ids(self, text):
         # Simple mock implementation - converts each character to its ASCII value