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Quorum-Reader-Qwen3-4B-Adapter

A LoRA adapter for Qwen/Qwen3-4B — the in-context reader of the Quorum 24-shot intent-classification ensemble.

Given 24 retrieved examples in the prompt (no weight update), it scores every candidate label in a single forward pass. Combined (geometric mean) with a frozen BAAI/bge-large-en-v1.5 nearest-neighbour over the same 24 examples, the ensemble reaches 0.932 on Banking77 (full 3,080 test) — above the closed API Jev's 0.924 at Jev's own 24-shot protocol. In our study a further configuration (per-class descriptions + a calibration-selected combination) reached 0.938 and significantly beat Jev on a paired McNemar test (p = 0.0014).

Training

LoRA (r = 64) on Qwen/Qwen3-4B, fine-tuned on a mixture of public intent-classification datasets with Banking77 held out. Single-forward answer-token option scoring.

Intended use & limitations

  • Use as the reader in the Quorum 24-shot pipeline (see the repo). Requires the base model + PEFT to load.
  • Contamination: the training mixture includes CLINC150, HWU64 and SNIPS — do not use this adapter to judge zero-shot generalization on those datasets.
  • Not a general-purpose chat model; not a claim of open zero-shot state-of-the-art.

Usage

# https://github.com/DataAgent-Lab/Quorum
python scripts/eval_24shot.py --dataset banking77 --adapter DataAgent/Quorum-Reader-Qwen3-4B-Adapter

License

Adapter weights: Apache-2.0. The base model and datasets retain their own licenses.

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