fix/get_chat_template (#1246)
* Refactor `get_chat_template` to now support system message instead. It supposed to fix ollama tokenizer chattemplate to * Remove type hinting * Update chat_templates.py --------- Co-authored-by: Daniel Han <danielhanchen@gmail.com>
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1 changed files with 89 additions and 8 deletions
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@ -39,6 +39,7 @@ from unsloth_zoo.dataset_utils import (
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train_on_responses_only,
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)
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CHAT_TEMPLATES = {}
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DEFAULT_SYSTEM_MESSAGE = {}
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# =========================================== Unsloth
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# Unsloth efficient template leverages from Zephyr
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@ -48,7 +49,7 @@ unsloth_template = \
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"{{ messages[0]['content'] + '\n' }}"\
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"{% set loop_messages = messages[1:] %}"\
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"{% else %}"\
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"{{ 'You are a helpful assistant to the user\n' }}"\
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"{{ '{system_message}' + '\n' }}"\
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"{% set loop_messages = messages %}"\
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"{% endif %}"\
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"{% for message in loop_messages %}"\
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@ -80,6 +81,7 @@ SYSTEM """You are a helpful assistant to the user"""
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unsloth_eos_token = "eos_token"
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CHAT_TEMPLATES["unsloth"] = (unsloth_template, unsloth_eos_token, False, unsloth_ollama,)
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DEFAULT_SYSTEM_MESSAGE["unsloth"] = "You are a helpful assistant to the user"
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pass
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# =========================================== Zephyr
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@ -116,6 +118,7 @@ PARAMETER min_p 0.1
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zephyr_eos_token = "eos_token"
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CHAT_TEMPLATES["zephyr"] = (zephyr_template, zephyr_eos_token, False, zephyr_ollama,)
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DEFAULT_SYSTEM_MESSAGE["zephyr"] = None # No system message in Zephyr
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pass
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# =========================================== ChatML
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@ -153,6 +156,7 @@ PARAMETER min_p 0.1
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chatml_eos_token = "<|im_end|>"
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CHAT_TEMPLATES["chatml"] = (chatml_template, chatml_eos_token, True, chatml_ollama,)
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DEFAULT_SYSTEM_MESSAGE["chatml"] = None # No system message in ChatML
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pass
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# =========================================== Mistral-1
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@ -193,6 +197,7 @@ PARAMETER min_p 0.1
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mistral_eos_token = "eos_token"
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CHAT_TEMPLATES["mistral"] = (mistral_template, mistral_eos_token, False, mistral_ollama,)
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DEFAULT_SYSTEM_MESSAGE["mistral"] = None # No system message in Mistral
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pass
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# =========================================== Llama-2
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@ -234,6 +239,7 @@ PARAMETER min_p 0.1
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llama_eos_token = "eos_token"
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CHAT_TEMPLATES["llama"] = (llama_template, llama_eos_token, False, llama_ollama,)
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DEFAULT_SYSTEM_MESSAGE["llama"] = None # No system message in Llama
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pass
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# =========================================== Vicuna
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@ -244,7 +250,7 @@ vicuna_template = \
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"{{ messages[0]['content'] + ' ' }}"\
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"{% set loop_messages = messages[1:] %}"\
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"{% else %}"\
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"{{ 'A chat between a curious user and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the user\\'s questions.' + ' ' }}"\
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"{{ '{system_message}' + ' ' }}"\
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"{% set loop_messages = messages %}"\
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"{% endif %}"\
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"{% for message in loop_messages %}"\
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@ -273,6 +279,7 @@ PARAMETER min_p 0.1
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vicuna_eos_token = "eos_token"
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CHAT_TEMPLATES["vicuna"] = (vicuna_template, vicuna_eos_token, False, vicuna_ollama,)
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DEFAULT_SYSTEM_MESSAGE["vicuna"] = "A chat between a curious user and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the user's questions."
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pass
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# =========================================== Vicuna Old
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@ -283,7 +290,7 @@ vicuna_old_template = \
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"{{ messages[0]['content'] + '\n' }}"\
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"{% set loop_messages = messages[1:] %}"\
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"{% else %}"\
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"{{ 'A chat between a curious human and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the human\\'s questions.' + '\n' }}"\
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"{{ '{system_message}' + '\n' }}"\
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"{% set loop_messages = messages %}"\
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"{% endif %}"\
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"{% for message in loop_messages %}"\
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@ -315,6 +322,10 @@ SYSTEM """A chat between a curious human and an artificial intelligence assistan
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vicuna_old_eos_token = "eos_token"
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CHAT_TEMPLATES["vicuna_old"] = (vicuna_old_template, vicuna_old_eos_token, False, vicuna_old_ollama,)
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DEFAULT_SYSTEM_MESSAGE["vicuna_old"] = "A chat between a curious human and an artificial intelligence assistant. The assistant gives helpful, detailed, and polite answers to the human\\'s questions."
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CHAT_TEMPLATES["vicuna old"] = CHAT_TEMPLATES["vicuna_old"]
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DEFAULT_SYSTEM_MESSAGE["vicuna old"] = DEFAULT_SYSTEM_MESSAGE["vicuna_old"]
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pass
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# =========================================== Alpaca multi turn
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@ -325,7 +336,7 @@ alpaca_template = \
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"{{ messages[0]['content'] + '\n\n' }}"\
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"{% set loop_messages = messages[1:] %}"\
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"{% else %}"\
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"{{ 'Below are some instructions that describe some tasks. Write responses that appropriately complete each request.\n\n' }}"\
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"{{ '{system_message}' + '\n\n' }}"\
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"{% set loop_messages = messages %}"\
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"{% endif %}"\
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"{% for message in loop_messages %}"\
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@ -362,6 +373,7 @@ SYSTEM """Below are some instructions that describe some tasks. Write responses
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alpaca_eos_token = "eos_token"
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CHAT_TEMPLATES["alpaca"] = (alpaca_template, alpaca_eos_token, False, alpaca_ollama,)
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DEFAULT_SYSTEM_MESSAGE["alpaca"] = "Below are some instructions that describe some tasks. Write responses that appropriately complete each request."
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pass
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# =========================================== Gemma
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@ -372,7 +384,7 @@ gemma_template = \
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"{{ bos_token }}"\
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"{% if messages[0]['role'] == 'system' %}"\
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"{{'<start_of_turn>user\n' + messages[0]['content'] | trim + ' ' + messages[1]['content'] | trim + '<end_of_turn>\n'}}"\
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"{% set loop_messages = messages[2:] %}"\
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"{% set messages = messages[2:] %}"\
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"{% endif %}"\
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"{% for message in messages %}"\
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"{% if message['role'] == 'user' %}"\
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@ -407,6 +419,7 @@ PARAMETER min_p 0.1
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gemma_eos_token = "<end_of_turn>"
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CHAT_TEMPLATES["gemma"] = (gemma_template, gemma_eos_token, True, gemma_ollama,)
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DEFAULT_SYSTEM_MESSAGE["gemma"] = None # No system message in Gemma
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pass
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# =========================================== Gemma with ChatML instead
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@ -437,6 +450,7 @@ gemma_chatml_eos_token = (
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"<|im_end|>",
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)
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CHAT_TEMPLATES["gemma_chatml"] = (gemma_chatml_template, gemma_chatml_eos_token, True, gemma_chatml_ollama,)
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DEFAULT_SYSTEM_MESSAGE["gemma_chatml"] = None # No system message in Gemma
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pass
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# =========================================== Gemma 2
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@ -446,12 +460,14 @@ gemma2_template = gemma_template
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gemma2_ollama = gemma_ollama + "PARAMETER num_ctx 4096\n"
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gemma2_eos_token = "<end_of_turn>"
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CHAT_TEMPLATES["gemma2"] = (gemma2_template, gemma2_eos_token, True, gemma2_ollama,)
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DEFAULT_SYSTEM_MESSAGE["gemma2"] = None # No system message in Gemma 2
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# =========================================== Gemma 2 with ChatML instead
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gemma2_chatml_template = gemma_chatml_template
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gemma2_chatml_ollama = gemma_chatml_ollama + "PARAMETER num_ctx 4096\n"
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gemma2_chatml_eos_token = gemma_chatml_eos_token
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CHAT_TEMPLATES["gemma2_chatml"] = (gemma2_chatml_template, gemma2_chatml_eos_token, True, gemma2_chatml_ollama,)
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DEFAULT_SYSTEM_MESSAGE["gemma2_chatml"] = None # No system message in Gemma 2
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pass
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# =========================================== Llama-3
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@ -491,7 +507,12 @@ PARAMETER min_p 0.1
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'''
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llama3_template_eos_token = "eos_token"
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CHAT_TEMPLATES["llama-3"] = (llama3_template, llama3_template_eos_token, False, llama3_ollama,)
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DEFAULT_SYSTEM_MESSAGE["llama-3"] = None # No system message in Llama-3
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CHAT_TEMPLATES["llama3"] = (llama3_template, llama3_template_eos_token, False, llama3_ollama,)
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DEFAULT_SYSTEM_MESSAGE["llama3"] = None # No system message in Llama-3
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pass
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@ -532,8 +553,13 @@ PARAMETER min_p 0.1
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phi3_template_eos_token = "<|end|>"
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CHAT_TEMPLATES["phi-3"] = (phi3_template, phi3_template_eos_token, False, phi3_ollama,)
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DEFAULT_SYSTEM_MESSAGE["phi-3"] = None # No system message in Phi-3
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CHAT_TEMPLATES["phi-35"] = CHAT_TEMPLATES["phi-3"]
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DEFAULT_SYSTEM_MESSAGE["phi-35"] = None # No system message in Phi-3.5
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CHAT_TEMPLATES["phi-3.5"] = CHAT_TEMPLATES["phi-3"]
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DEFAULT_SYSTEM_MESSAGE["phi-3.5"] = None # No system message in Phi-3.5
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pass
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# =========================================== Llama-3.1
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@ -573,7 +599,7 @@ llama31_template = \
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{%- set system_message = messages[0]['content'] %}
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{%- set messages = messages[1:] %}
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{%- else %}
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{%- set system_message = "" %}
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{%- set system_message = "{system_message}" %}
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{%- endif %}
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{#- System message + builtin tools #}
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@ -729,7 +755,10 @@ PARAMETER min_p 0.1
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llama31_template_eos_token = "eos_token"
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CHAT_TEMPLATES["llama-3.1"] = (llama31_template, llama31_template_eos_token, False, llama31_ollama,)
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DEFAULT_SYSTEM_MESSAGE["llama-3.1"] = "" # Llama3.1 default system message is empty + the dates
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CHAT_TEMPLATES["llama-31"] = (llama31_template, llama31_template_eos_token, False, llama31_ollama,)
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DEFAULT_SYSTEM_MESSAGE["llama-31"] = "" # Llama3.1 default system message is empty + the dates
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pass
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@ -751,7 +780,7 @@ qwen25_template = \
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{%- if messages[0][\'role\'] == \'system\' %}
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{{- \'<|im_start|>system\\n\' + messages[0][\'content\'] + \'<|im_end|>\\n\' }}
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{%- else %}
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{{- \'<|im_start|>system\\nYou are Qwen, created by Alibaba Cloud. You are a helpful assistant.<|im_end|>\\n\' }}
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{{- \'<|im_start|>system\\n{system_message}<|im_end|>\\n\' }}
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{%- endif %}\n{%- endif %}\n{%- for message in messages %}
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{%- if (message.role == "user") or (message.role == "system" and not loop.first) or (message.role == "assistant" and not message.tool_calls) %}
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{{- \'<|im_start|>\' + message.role + \'\\n\' + message.content + \'<|im_end|>\' + \'\\n\' }}
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@ -847,10 +876,53 @@ PARAMETER min_p 0.1
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'''
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qwen25_template_eos_token = "eos_token"
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qwen25_default_system_message = "You are Qwen, created by Alibaba Cloud. You are a helpful assistant."
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CHAT_TEMPLATES["qwen-2.5"] = (qwen25_template, qwen25_template_eos_token, False, qwen25_ollama,)
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DEFAULT_SYSTEM_MESSAGE["qwen-2.5"] = qwen25_default_system_message # No system message in Qwen 2.5
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CHAT_TEMPLATES["qwen-25"] = (qwen25_template, qwen25_template_eos_token, False, qwen25_ollama,)
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DEFAULT_SYSTEM_MESSAGE["qwen-25"] = qwen25_default_system_message # No system message in Qwen 2.5
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CHAT_TEMPLATES["qwen25"] = (qwen25_template, qwen25_template_eos_token, False, qwen25_ollama,)
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DEFAULT_SYSTEM_MESSAGE["qwen25"] = qwen25_default_system_message # No system message in Qwen 2.5
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CHAT_TEMPLATES["qwen2.5"] = (qwen25_template, qwen25_template_eos_token, False, qwen25_ollama,)
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DEFAULT_SYSTEM_MESSAGE["qwen2.5"] = qwen25_default_system_message # No system message in Qwen 2.5
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pass
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def _change_system_message(template: str, type_chat_template: str, system_message: str = None):
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system_message_pattern = r"\{system_message\}"
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# For predefined templates, check if default system message exists
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default_system_message = DEFAULT_SYSTEM_MESSAGE.get(f"{type_chat_template}", None)
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if default_system_message is None:
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if system_message is not None:
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logger.warning_once(
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f"Unsloth: You tried to change the system message for {type_chat_template}, "
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"but it doesn't have a default system message. "
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"You need to manually add the system message in your data."
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)
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return template, system_message
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pass
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# For custom templates
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if type_chat_template is None:
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has_placeholder = re.search(system_message_pattern, template) is not None
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if has_placeholder:
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if system_message is None:
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raise ValueError("Unsloth: You need to provide a system message for custom templates.")
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new_template = re.sub(system_message_pattern, system_message, template)
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return new_template, system_message
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return template, system_message
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pass
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# For predefined templates with default system message
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message_to_use = system_message if system_message is not None else default_system_message
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new_template = re.sub(system_message_pattern, message_to_use, template)
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return new_template, message_to_use
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pass
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@ -886,14 +958,20 @@ def get_chat_template(
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old_padding_side = tokenizer.padding_side
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same_padding_token = False
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type_chat_template = None
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if type(chat_template) in (list, tuple,):
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# For changing system message later
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# Since it's not supported yet, we will raise an error first!
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type_chat_template = chat_template[0].lower()
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chat_template, stop_word = chat_template
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assert(type(chat_template) is str)
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assert(type(stop_word) is str)
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ollama_modelfile = None
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elif type(chat_template) is str:
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# For changing system message later
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type_chat_template = chat_template.lower()
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chat_template, stop_word, yes_map_eos_token, ollama_modelfile = CHAT_TEMPLATES[chat_template]
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@ -1052,6 +1130,9 @@ def get_chat_template(
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else:
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chat_template = new_chat_template
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pass
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chat_template, system_message = _change_system_message(chat_template, type_chat_template, system_message)
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tokenizer.chat_template = chat_template
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# Also fix up other tokens
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