---
language:
- en
license: apache-2.0
library_name: peft
base_model: Qwen/Qwen2.5-3B-Instruct
tags:
- clinical
- extraction
- medical
- qlora
- lora
- healthcare
- on-prem
- dilr
- schema-agnostic
datasets:
- synthea
pipeline_tag: text-generation
---

# Mira-Q2 — Clinical Extraction SLM (v2)

**By [DILR](https://dilr.ai)** — Enterprise-grade clinical document extraction. Reads documents, outputs structured, source-grounded JSON. Deployed on-prem.

## Comprehensive Evaluation (782 docs across 4 test sets)

| Eval Set | N | Type | JSON Validity | Identifier Leak | Field-F1 |
|----------|---|------|---------------|-----------------|----------|
| **test_gold** | 200 | Same distribution (held-out) | **100.0%** [1.0-1.0] | **0.0%** | **1.000** [0.999-1.0] |
| **synthetic_v2** | 150 | Different formatting dialect | **100.0%** [1.0-1.0] | **0.0%** | n/a (unlabeled) |
| **extraction_relevant** | 150 | Real physician docs (on-schema) | **94.7%** [90.7-98.0] | **0.0%** | n/a (unlabeled) |
| **mtsamples** | 282 | Real physician docs (39 specialties) | **85.8%** [81.9-89.7] | **0.0%** | n/a (unlabeled) |

*95% bootstrap CIs (1000 resamples). Zero identifier leaks across all 782 documents.*

## Three-Way Comparison

| Model | Training Data | Validity (test_gold) | F1 (test_gold) |
|-------|--------------|---------------------|----------------|
| Qwen2.5-3B zero-shot | — | **0%** (invents own schema) | 0.0 |
| **Mira-Q1** (v1) | 3,438 examples | 98% (50-example eval) | — |
| **Mira-Q2** (this model) | 8,400 examples | **100%** (200-example eval) | **1.000** |

## Training

| Parameter | Value |
|-----------|-------|
| Base model | Qwen/Qwen2.5-3B-Instruct (via Unsloth) |
| Method | QLoRA (4-bit, r=16, alpha=32) |
| Training data | 8,400 examples (6,400 gold-by-construction + 2,000 schema variants) |
| Data sources | Real ICD-10 codes (71K), NLM drug names, curated lab reference ranges |
| Schema variants | Renamed fields, dropped fields, minimal schemas (for generalization) |
| Epochs | 2 |
| Final train loss | 0.132 |
| Final eval loss | 0.142 |
| Overfit gap | 0.010 (healthy) |

### Loss Curve
```
Step   50: 1.0723  (epoch 0.1)
Step  200: 0.1556  (epoch 0.4)
Step  525: 0.1414  (epoch 1.0) — checkpoint
Step  750: 0.1318  (epoch 1.4) — lowest
Step 1050: 0.1320  (epoch 2.0) — final
Eval:      0.1418  (epoch 2.0)
```

## What's New vs Mira-Q1

- **2.4x more training data** (8,400 vs 3,438)
- **Gold-by-construction data** — real ICD-10 codes, NLM drugs, real lab reference ranges (not Synthea-rendered)
- **Schema-variant training** — 2,000 examples with modified schemas for schema-as-input generalization
- **8% lower loss** (0.132 vs 0.143)
- **100% validity** on 200-example gold eval (vs 98% on 50 examples)
- **Comprehensive eval** on 782 docs including real physician dictations
- **Zero identifier leaks** verified across all test sets

## Synthetic-to-Real Gap

The honest finding: Mira-Q2 scores 100% on training-distribution data but 86% on general real physician prose (MTSamples). This is expected for a model trained on synthetic data — it learned our generator's patterns well but struggles with document types it never saw (operative notes, physical exams). The gap narrows to ~5% on on-schema real docs (94.7%).

**This gap closes with:** real partner data retraining (v1), broader document type coverage in training, and OCR pipeline integration.

## Usage

```python
# IMPORTANT: Load with Unsloth (not standard PeftModel — quantization mismatch)
from unsloth import FastLanguageModel

model, tokenizer = FastLanguageModel.from_pretrained(
    model_name="dilr/Mira-Q2",
    max_seq_length=4096,
    dtype=torch.float16,
    load_in_4bit=True,
)
FastLanguageModel.for_inference(model)

messages = [
    {"role": "system", "content": "You are a clinical information extraction system..."},
    {"role": "user", "content": "Patient: 45/M\nHb 12.5 g/dL (13-17) LOW\nWBC 8.2 x10^9/L (4-11) Normal"},
]

text = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = tokenizer(text, return_tensors="pt").to("cuda")
outputs = model.generate(**inputs, max_new_tokens=1024, do_sample=False,
                          eos_token_id=[tokenizer.eos_token_id,
                                        tokenizer.convert_tokens_to_ids("<|im_end|>")])
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))
```

**Note:** Do NOT load with `PeftModel.from_pretrained(base, "dilr/Mira-Q2")` — the adapter was trained with Unsloth's quantization which differs from standard bitsandbytes. Use `FastLanguageModel` as shown above.

## Schema

Extracts 10 required fields:
- `document_type`: lab_report | medication_list | discharge_summary | pathology_report | intake_form | progress_note | other
- `patient`: {age, sex} — de-identified, never includes names/MRN
- `encounter`: {date (ISO), department}
- `vitals[]`, `labs[]`, `medications[]`, `diagnoses[]`, `procedures[]`, `allergies[]`
- `extraction_notes`

## Architecture: Schema-as-Input

Mira-Q2 is trained with **schema-variant examples** — the model learns to follow *any* extraction schema injected in the system prompt, not just the clinical one. This enables customer onboarding with zero code changes (schema file + seed examples only).

## Eval Data

The `eval/` directory contains:
- `comprehensive_scorecard.json` — full results with bootstrap CIs
- `test_gold_200_result.json` — test_gold scorecard
- `mtsamples_282_result.json` — real MTSamples probe
- `extraction_relevant_150_result.json` — on-schema real docs
- `synthetic_v2_150_result.json` — format robustness probe

## Limitations

- English only
- Trained on synthetic data — real clinical document retraining improves accuracy (v1 with design partner)
- 86% validity on general real docs (39 specialties) — strongest on lab/discharge/med types it was trained on
- Every output is a **draft for human review** — not for autonomous clinical decisions
- Must load with Unsloth (not vanilla PeftModel)

## License

Apache-2.0 (same as base model)