HIKARI-Deneb-8B-SkinDx-Cascade

Healthcare-oriented Intelligent Knowledge Augmented Retrieval and Inference
Named after Deneb — tail star of Cygnus the Swan, tracing the cascade from group to disease

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📦 Model Type: Merged Full Model

This is a fully merged model — the LoRA adapter weights have been merged directly into the base model weights.

✅ No adapter loading needed. Load and run directly with transformers, vLLM, or SGLang.

💾 Size: ~17 GB (4 safetensor shards)

🔌 Lightweight adapter version: E27085921/HIKARI-Deneb-8B-SkinDx-Cascade-LoRA (~1.1 GB)

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Overview

HIKARI-Deneb uses 2-Stage Cascade Fine-Tuning for 10-class skin disease diagnosis. Instead of starting from the raw base model, Stage 2 disease training begins from the weights of HIKARI-Subaru-8B-SkinGroup (the 4-class group classifier). The model inherits group-level visual discrimination before learning disease-level distinctions.

Property	Value
Task	10-class skin disease diagnosis (Stage 2)
Base model	Qwen/Qwen3-VL-8B-Thinking
Init weights	HIKARI-Subaru group classifier (cascaded)
Val accuracy (no RAG)	74.00%
Val accuracy (R2 α=0.9)	79.80% (with RAG retrieval at inference)
Model type	Merged full model

Why Cascade?

Training Start	Accuracy	Reason
Raw base model (Altair)	74.00%	Learns disease features from scratch
Group Classifier weights (Deneb)	79.80%	Pre-trained on inter-group visual comparison

Starting from the group classifier teaches the model to compare visual features across skin disease groups before learning fine-grained disease distinctions — making it significantly more effective when used with RAG reference images.

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🔧 Quick Inference — transformers

from transformers import Qwen3VLForConditionalGeneration, AutoProcessor
import torch
from PIL import Image

model_id = "E27085921/HIKARI-Deneb-8B-SkinDx-Cascade"

processor = AutoProcessor.from_pretrained(model_id, trust_remote_code=True)
model = Qwen3VLForConditionalGeneration.from_pretrained(
    model_id, torch_dtype=torch.bfloat16, device_map="auto", trust_remote_code=True
)

image = Image.open("skin_lesion.jpg").convert("RGB")
group = "inflammatory"  # from Stage 1 (HIKARI-Subaru)

PROMPT = (
    "This skin lesion belongs to the group '{group}'. "
    "Examine the lesion morphology (papules, plaques, macules), "
    "color (red, violet, white, brown), scale/crust, border sharpness, "
    "and distribution pattern. Based on these visual features, "
    "what is the specific skin disease?"
)

messages = [{"role": "user", "content": [
    {"type": "image", "image": image},
    {"type": "text", "text": PROMPT.format(group=group)},
]}]
text = processor.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = processor(text=[text], images=[image], return_tensors="pt").to(model.device)

with torch.no_grad():
    out = model.generate(**inputs, max_new_tokens=64, temperature=0.0, do_sample=False)

print(processor.batch_decode(out[:, inputs["input_ids"].shape[1]:], skip_special_tokens=True)[0].strip())

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🔌 LoRA Adapter Version

from peft import PeftModel
from transformers import Qwen3VLForConditionalGeneration
import torch

base = Qwen3VLForConditionalGeneration.from_pretrained(
    "Qwen/Qwen3-VL-8B-Thinking", torch_dtype=torch.bfloat16, device_map="auto"
)
model = PeftModel.from_pretrained(base, "E27085921/HIKARI-Deneb-8B-SkinDx-Cascade-LoRA")

→ E27085921/HIKARI-Deneb-8B-SkinDx-Cascade-LoRA

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📄 Citation

@misc{hikari2026,
  title  = {HIKARI: RAG-in-Training for Skin Disease Diagnosis
            with Cascaded Vision-Language Models},
  author = {Watin Promfiy and Pawitra Boonprasart},
  year   = {2026},
  institution = {King Mongkut's Institute of Technology Ladkrabang,
                 Department of Information Technology, Bangkok, Thailand}
}

Made with ❤️ at King Mongkut's Institute of Technology Ladkrabang (KMITL)