Base model should not use chat template.

tokenizer_config.json

@@ -15,5 +15,4 @@
   "unk_token": "<unk>",
   "use_default_system_prompt": false,
   "add_prefix_space": true,
-  "chat_template": "{% for message in messages %}{% if loop.first and messages[0]['role'] != 'system' %}{{ '<|im_start|>system\nYou are a helpful assistant<|im_end|>\n' }}{% endif %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}"
 }