Warn if we override the chat template in the tokenizer config

src/axolotl/utils/models.py

@@ -291,6 +291,12 @@ def load_tokenizer(cfg):
  "You are a helpful assistant.", cfg.default_system_message
  )
 
+ if tokenizer.chat_template:
+ LOG.warning(
+ "The chat template is being overridden by the one in the config. "
+ "This may cause a mismatch with the existing chat template in the base model. "
+ "Please verify that this override is intended and compatible."
+ )
  tokenizer.chat_template = chat_template_string
  else:
  LOG.info(