23 lines
959 B
Plaintext
23 lines
959 B
Plaintext
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{%- set ns = namespace(expected='user') -%}
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{%- for message in messages -%}
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{%- set role = 'model' if message['role'] == 'assistant' else message['role'] -%}
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{%- if role == 'system' -%}
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{%- if not loop.first -%}
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{{- raise_exception("System message, if present, must be first.") -}}
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{%- endif -%}
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{{- '<|im_start|>system\n' + message['content'] + '<|im_end|>\n' -}}
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{%- else -%}
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{%- if role not in ['user', 'model'] -%}
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{{- raise_exception("Only 'system', 'user' and 'model' (or 'assistant') roles are allowed, got: " + message['role']) -}}
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{%- endif -%}
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{%- if role != ns.expected -%}
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{{- raise_exception("user/model must alternate starting with user; expected " + ns.expected + ", got " + role) -}}
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{%- endif -%}
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{%- set ns.expected = 'model' if role == 'user' else 'user' -%}
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{{- '<|im_start|>' + role + '\n' + message['content'] + '<|im_end|>\n' -}}
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{%- endif -%}
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{%- endfor -%}
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{%- if add_generation_prompt -%}
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{{- '<|im_start|>model\n' -}}
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{%- endif -%}
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