| """ | |
| This module provides functionality for selecting chat templates based on user choices. | |
| These templates are used for formatting messages in a conversation. | |
| """ | |
| def chat_templates(user_choice: str): | |
| """ | |
| Finds the correct chat_template for the tokenizer_config. | |
| Args: | |
| user_choice (str): The user's choice of template. | |
| Returns: | |
| str: The chosen template string. | |
| Raises: | |
| ValueError: If the user_choice is not found in the templates. | |
| """ | |
| templates = { | |
| "alpaca": "{% for message in messages %}{% if message['role'] == 'user' %}{{ '### Instruction: ' + message['content'] + '\n\n' }}{% elif message['role'] == 'assistant' %}{{ '### Response: ' + message['content'] + eos_token}}{% endif %}{% endfor %}", | |
| "inst": "{{ bos_token }}{% for message in messages %}{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}{% endif %}{% if message['role'] == 'user' %}{{ '[INST] ' + message['content'] + ' [/INST]' }}{% elif message['role'] == 'assistant' %}{{ message['content'] + eos_token}}{% else %}{{ raise_exception('Only user and assistant roles are supported!') }}{% endif %}{% endfor %}", # I don't know what this one is called. Used by Mistral/Mixtral. | |
| "chatml": "{% if messages[0]['role'] == 'system' %}{% set loop_messages = messages[1:] %}{% set system_message = messages[0]['content'] %}{% else %}{% set loop_messages = messages %}{% set system_message = 'You are a helpful assistant.' %}{% endif %}{% if not add_generation_prompt is defined %}{% set add_generation_prompt = false %}{% endif %}{% for message in loop_messages %}{% if loop.index0 == 0 %}{{'<|im_start|>system\n' + system_message + '<|im_end|>\n'}}{% endif %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}", | |
| } | |
| if user_choice in templates: | |
| return templates[user_choice] | |
| raise ValueError(f"Template '{user_choice}' not found.") | |