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a b/chat_templates/gemma-it.jinja
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{% if messages[0]['role'] == 'system' %}
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    {% set system_message = messages[0]['content'] | trim + '\n\n' %}
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    {% set messages = messages[1:] %}
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{% else %}
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    {% set system_message = '' %}
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{% endif %}
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{% for message in messages %}
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    {% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}
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        {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}
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    {% endif %}
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    {% if loop.index0 == 0 %}
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        {% set content = system_message + message['content'] %}
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    {% else %}
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        {% set content = message['content'] %}
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    {% endif %}
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    {% if (message['role'] == 'assistant') %}
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        {% set role = 'model' %}
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    {% else %}
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        {% set role = message['role'] %}
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    {% endif %}
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    {{ '<start_of_turn>' + role + '\n' + content | trim + '<end_of_turn>\n' }}
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{% endfor %}
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{% if add_generation_prompt %}
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    {{'<start_of_turn>model\n'}}
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{% endif %}