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- Modified `chat_template` so that it supports the `system` role.
### Chat template
```jinja
{{ bos_token }}
{% if messages[0]['role'] == 'system' %}
{% set loop_messages = messages[1:] %}
{% set system_message = messages[0]['content'] + ' ' %}
{% else %}
{% set loop_messages = messages %}
{% set system_message = '' %}
{% endif %}
{% for message in loop_messages %}
{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}
{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}
{% endif %}
{% if loop.index0 == 0 %}
{% set content = system_message + message['content'] %}
{% else %}
{% set content = message['content'] %}
{% endif %}
{% if (message['role'] == 'assistant') %}
{% set role = 'model' %}
{% else %}
{% set role = message['role'] %}
{% endif %}
{{ '<start_of_turn>' + role + '\n' + (content | trim) + '<end_of_turn>\n' }}
{% endfor %}
{% if add_generation_prompt %}
{{'<start_of_turn>model\n'}}
{% endif %}
```
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