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ChatTS-14B

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Fix: Add chat_template to tokenizer config

Recent versions of transformers (v4.44+) no longer allow a default chat template.
The latest model revision removed this field, causing errors in vLLM and Hugging Face preprocessing:

ValueError: As of transformers v4.44, default chat template is no longer allowed...

Change
Restored the previous template in tokenizer_config.json:

"chat_template": "{% set system_message = 'You are a helpful assistant.' %}{% if messages[0]['role'] == 'system' %}{% set system_message = messages[0]['content'] %}{% endif %}{% if system_message is defined %}{{ '<|im_start|>system\\n' + system_message + '<|im_end|>\\n' }}{% endif %}{% for message in messages %}{% set content = message['content'] %}{% if message['role'] == 'user' %}{{ '<|im_start|>user\\n' + content + '<|im_end|>\\n<|im_start|>assistant\\n' }}{% elif message['role'] == 'assistant' %}{{ content + '<|im_end|>' + '\\n' }}{% endif %}{% endfor %}"

Result

• apply_chat_template works again
• vLLM /chat/completions endpoint runs without error
• Maintains backward compatibility with earlier formatting