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convert: Zamba2-VL template, images as llama.cpp's media markers #17

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Merged
bong-water-water-bong merged 1 commit into from
Sep 26, 2026
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convert: Zamba2-VL template, images as llama.cpp's media markers #17

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48 changes: 30 additions & 18 deletions conversion/zamba2vl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,27 +67,39 @@ def set_vocab(self):
special_vocab.chat_template = self._CHAT_TEMPLATE
special_vocab.add_to_gguf(self.gguf_writer)

# Zyphra's template only takes content as a list of parts. llama.cpp passes a string, with a
# media marker where each image was; this one takes both, and puts the images in front of the
# user turn as Zyphra's does (mtmd wraps each in <|vision_start|> ... <|vision_end|>).
# Zyphra's template only takes content as a list of image and text parts. llama.cpp passes a
# message with media as a string holding a marker, <__media_<id>__> with an id random per server,
# where each image was; this one takes both, and puts the images (the markers) in front of the
# user turn, as Zyphra's does (mtmd wraps each image in <|vision_start|> ... <|vision_end|>).
_CHAT_TEMPLATE = (
"{%- for message in messages -%}"
'{%- for message in messages -%}'
"{%- if message['content'] is string -%}"
"{%- set text = message['content'] -%}"
"{%- set n_img = (text.split('<__media__>') | length) - 1 -%}"
"{%- set text = text.replace('<__media__>', '') | trim -%}"
"{%- else -%}"
"{%- set text = message['content'] | selectattr('type', 'equalto', 'text') | map(attribute='text') | join('') -%}"
"{%- set n_img = message['content'] | selectattr('type', 'equalto', 'image') | list | length -%}"
"{%- endif -%}"
"{%- set ns = namespace(text=message['content'], media='') -%}"
'{%- else -%}'
"{%- set ns = namespace(text=message['content'] | selectattr('type', 'equalto', 'text') | map(attribute='text') | join(''), media='') -%}"
"{%- for c in message['content'] | selectattr('type', 'equalto', 'image') -%}"
"{%- set ns.media = ns.media ~ '<|vision_start|><image><|vision_end|>\\n' -%}"
'{%- endfor -%}'
'{%- endif -%}'
"{%- set segs = ns.text.split('<__media_') -%}"
'{%- if segs | length > 1 -%}'
'{%- set ns.text = segs[0] -%}'
'{%- for seg in segs[1:] -%}'
"{%- set bits = seg.split('>') -%}"
"{%- set ns.media = ns.media ~ '<__media_' ~ bits[0] ~ '>\\n' -%}"
"{%- set ns.text = ns.text ~ (bits[1:] | join('>')) -%}"
'{%- endfor -%}'
'{%- set ns.text = ns.text | trim -%}'
'{%- endif -%}'
"{%- if message['role'] == 'user' -%}"
"{%- for i in range(n_img) -%}{{ '<__media__>\\n' }}{%- endfor -%}"
"{{ '<s>user\\n' ~ text ~ '</s>\\n' }}"
"{%- else -%}"
"{{ '<s>' ~ message['role'] ~ '\\n' ~ text ~ '</s>' }}"
"{%- endif -%}"
"{%- endfor -%}"
"{%- if add_generation_prompt -%}{{ '<s>assistant\\n' }}{%- endif -%}"
"{{ ns.media ~ '<s>user\\n' ~ ns.text ~ '</s>\\n' }}"
'{%- else -%}'
"{{ '<s>' ~ message['role'] ~ '\\n' ~ ns.text ~ '</s>' }}"
'{%- endif -%}'
'{%- endfor -%}'
'{%- if add_generation_prompt -%}'
"{{ '<s>assistant\\n' }}"
'{%- endif -%}'
)


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