---
base_model: google/gemma-3-27b-it
library_name: peft
license: gemma
pipeline_tag: text-generation
tags:
- lora
- peft
- gemma3
- information-extraction
---

# Domain-Specific IE Adapter — Gemma 3 27B (long instruction)

LoRA adapter for `google/gemma-3-27b-it` fine-tuned to extract compensation-consultant mentions from SEC proxy statements (DEF 14A), classifying each firm as:

- **RET** — consultant retained/engaged as a compensation advisor
- **SURV** — survey-only data provider (not retained as an advisor)

Companion artifact for the anonymous submission *"From Lengthy Narrative to Structured Data: Instruction Fine-Tuning Open-Weight LLMs for Information Extraction from Corporate Disclosures."*

## This adapter

| | |
|---|---|
| Base model | `google/gemma-3-27b-it` |
| Method | LoRA (r=8, α=16), 4-bit QLoRA |
| Instruction format | **detailed (long)** |
| Instance-level F1 | **95.9%** |

Each adapter is trained for one instruction variant — pair this adapter with the **long** prompt at inference.

## Adapter family (same task, 2,001-sample training set)

| Adapter | Base | Instruction | F1 |
|---|---|---|---|
| `domain-specific-adapter` | Gemma 3 27B | detailed (long) | 95.9% |
| `domain-specific-adapter-short` | Gemma 3 27B | minimal (short) | 96.1% |
| `domain-specific-12b-adapter` | Gemma 3 12B | detailed (long) | 95.7% |
| `domain-specific-12b-adapter-short` | Gemma 3 12B | minimal (short) | 93.0% |

Evaluated on 316 consultants across 143 company-years from 84 SEC filings.

## Usage

```python
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel

base = "google/gemma-3-27b-it"
tok = AutoTokenizer.from_pretrained(base)
model = AutoModelForCausalLM.from_pretrained(base, device_map="auto", load_in_4bit=True)
model = PeftModel.from_pretrained(model, "cs-file-uploads/domain-specific-adapter")
```

See the code repository for the full inference pipeline (retrieval → chunking → extraction → grounding validation → cross-chunk aggregation) and the exact prompt templates.

## Output format

```
{RET: 'Pearl Meyer & Partners, LLC'}, {SURV: 'Mercer', 'Radford'}
```

## Training

2,001 human-labeled and augmented proxy-statement excerpts; LR 2e-4 (cosine, 3% warmup); max sequence length 5,120; 3 epochs; 20% validation split.

## License

Derived from Google **Gemma 3**; use is subject to the [Gemma Terms of Use](https://ai.google.dev/gemma/terms). Adapter weights are released for research use.

## Citation

```bibtex
@misc{anonymous2026fromlengthy,
  title={From Lengthy Narrative to Structured Data: Instruction Fine-Tuning Open-Weight LLMs for Information Extraction from Corporate Disclosures},
  author={Anonymous},
  year={2026},
  note={Under review}
}
```