Initial release: pyrrho-modernbert-base-v1

README.md

@@ -0,0 +1,204 @@
+---
+license: apache-2.0
+library_name: transformers
+pipeline_tag: text-classification
+language:
+  - en
+base_model: answerdotai/ModernBERT-base
+tags:
+  - rag
+  - governance
+  - hallucination-detection
+  - epistemic-honesty
+  - classification
+  - fitz-gov
+  - pyrrho
+datasets:
+  - fitz-gov
+metrics:
+  - accuracy
+  - f1
+  - false-trustworthy-rate
+---
+
+# pyrrho-modernbert-base-v1
+
+> Decide whether your retrieved sources support a confident answer, contradict each other, or simply don't contain it — **without an LLM call**.
+
+Named for [Pyrrho of Elis](https://en.wikipedia.org/wiki/Pyrrho), the Greek philosopher whose school practiced suspension of judgment when evidence was insufficient.
+
+This is a fine-tune of [`answerdotai/ModernBERT-base`](https://huggingface.co/answerdotai/ModernBERT-base) on [fitz-gov](https://github.com/yafitzdev/fitz-gov) v5.1 for **3-class RAG governance classification**: given a `(query, retrieved contexts)` pair, predicts one of:
+
+| Verdict | Meaning |
+|---|---|
+| `ABSTAIN` | The sources do not contain enough information to answer. |
+| `DISPUTED` | The sources contradict each other on the answer. |
+| `TRUSTWORTHY` | The sources consistently and sufficiently support an answer. |
+
+A drop-in replacement for the constraint+sklearn governance pipeline in [fitz-sage](https://github.com/yafitzdev/fitz-sage). Single forward pass, ~30 ms on CPU after INT8 ONNX quantization, no external LLM dependency.
+
+---
+
+## Results
+
+Validated on the [fitz-gov](https://github.com/yafitzdev/fitz-gov) v5.1 eval split (584 cases, stratified 20% hold-out from `tier1_core`). All numbers are **3-seed mean ± std** across seeds [42, 1337, 7].
+
+| Metric | pyrrho v1 | fitz-sage v0.11 (sklearn baseline) | Δ |
+|---|---|---|---|
+| Overall accuracy (calibrated) | **86.13 ± 0.86** | 78.7 | **+7.43** |
+| False-trustworthy rate (safety) | **5.27 ± 0.21** | 5.7 | **-0.43** (safer) |
+| Trustworthy recall | **79.38 ± 1.64** | 70.0 | **+9.38** |
+| Disputed recall | **94.81 ± 1.28** | 86.1 | **+8.71** |
+| Abstain recall | **92.94 ± 1.11** | 86.5 | **+6.44** |
+| Macro F1 | 86.10 ± 0.80 | n/a | — |
+
+Every margin is multiple standard deviations larger than seed noise — not a lucky-run artifact.
+
+### Uncalibrated (argmax) numbers, for reference
+
+| Metric | pyrrho v1 (uncalibrated) |
+|---|---|
+| Overall accuracy | 86.82 ± 1.54 |
+| Macro F1 | 86.63 ± 1.32 |
+| False-trustworthy rate | 8.33 ± 2.86 |
+| Trustworthy recall | 83.23 ± 5.33 |
+| Disputed recall | 93.09 ± 3.34 |
+| Abstain recall | 88.81 ± 2.76 |
+
+---
+
+## Known limitations
+
+1. **Multi-source-convergence cases can be misclassified as DISPUTED.** When multiple authoritative sources state the same fact with slight numerical variation that falls within measurement tolerance (e.g., 4 climate agencies citing 1.09–1.20 °C of warming, or NIST and IUPAC both giving the speed of light), the model occasionally classifies the case as DISPUTED with high confidence. On the relevant fitz-gov subcategory (`multi_source_convergence`, n=7) the error rate is ~57%. A v2 release with augmented training data targeting this pattern is planned.
+
+2. **Short, direct factual contexts can trigger over-abstention.** Smoke-test example: query *"When was the iPhone released?"* + a single-sentence context confirming June 29, 2007 → predicted `ABSTAIN` with P(ABSTAIN)=0.92. The model was trained on 62.7% hard tier1 cases (rich methodological contexts), so it underweights the short-clean-answer pattern. Production RAG chunks (typically 200–500 chars) are tier1-like and largely unaffected.
+
+---
+
+## Usage
+
+### Direct (transformers)
+
+```python
+from transformers import AutoTokenizer, AutoModelForSequenceClassification
+import torch
+
+tokenizer = AutoTokenizer.from_pretrained("yafitzdev/pyrrho-modernbert-base-v1")
+model = AutoModelForSequenceClassification.from_pretrained("yafitzdev/pyrrho-modernbert-base-v1").eval()
+
+query = "Has the company achieved profitability?"
+contexts = [
+    "The company posted its first profitable quarter, with net income of $4 million.",
+    "The company recorded a quarterly loss of $12 million, the third consecutive losing quarter.",
+]
+
+# Build the input the same way training data was formatted
+text = f"Question: {query}\n\nSources:\n" + "\n".join(
+    f"[{i}] {c}" for i, c in enumerate(contexts, start=1)
+)
+
+enc = tokenizer(text, truncation=True, max_length=4096, return_tensors="pt")
+with torch.no_grad():
+    logits = model(**enc).logits[0]
+probs = torch.softmax(logits, dim=-1).numpy()
+labels = ["ABSTAIN", "DISPUTED", "TRUSTWORTHY"]
+print(f"Predicted: {labels[int(probs.argmax())]}")
+print(f"Probs    : A={probs[0]:.3f} D={probs[1]:.3f} T={probs[2]:.3f}")
+```
+
+### CPU-optimized (ONNX + INT8)
+
+For production CPU inference at ~30 ms / case, load the INT8 ONNX variant via `optimum`:
+
+```python
+from optimum.onnxruntime import ORTModelForSequenceClassification
+from transformers import AutoTokenizer
+
+tokenizer = AutoTokenizer.from_pretrained("yafitzdev/pyrrho-modernbert-base-v1")
+model = ORTModelForSequenceClassification.from_pretrained(
+    "yafitzdev/pyrrho-modernbert-base-v1",
+    file_name="model_quantized.onnx",
+)
+# Same input format as above...
+```
+
+### Calibrated decision rule
+
+The headline numbers above use **threshold calibration** on the TRUSTWORTHY softmax probability. To match the published numbers, fall back from `TRUSTWORTHY` to the runner-up class when `P(TRUSTWORTHY) < tau`. The per-seed selected `tau` varied across runs (0.34–0.62); the safest default is `tau = 0.50`.
+
+```python
+TAU = 0.50
+pred = int(probs.argmax())
+if pred == 2 and probs[2] < TAU:  # TRUSTWORTHY id is 2
+    pred = int(probs[:2].argmax())   # fall back to runner-up between ABSTAIN/DISPUTED
+```
+
+---
+
+## Training
+
+| Hyperparameter | Value |
+|---|---|
+| Base model | `answerdotai/ModernBERT-base` |
+| Architecture | ModernBERT (sequence classification head) |
+| Labels (3-class) | ABSTAIN (0), DISPUTED (1), TRUSTWORTHY (2) |
+| Max sequence length | 4096 tokens |
+| Epochs | 5 (with early stopping, patience 2) |
+| Per-device batch size | 16 |
+| Effective batch size | 16 |
+| Learning rate | 5e-5 |
+| LR scheduler | cosine, 10% warmup |
+| Weight decay | 0.01 |
+| Label smoothing | 0.15 |
+| Class weights | [2.3, 2.3, 1.0] (counters TRUSTWORTHY-over-prediction from 53% class imbalance) |
+| Loss | Weighted cross-entropy + label smoothing |
+| Selection metric | `ft_penalized_accuracy = accuracy - 3 * max(0, FT - 0.057)` |
+| Optimizer | adamw_torch_fused (bf16) |
+| Hardware | NVIDIA RTX 5090 (Blackwell sm_120) |
+| Training time | ~80–500 s per run depending on GPU contention |
+
+Training data: fitz-gov v5.1 `tier1_core`, stratified 80/20 split by `(label, difficulty)` for train/eval. The 60-case `tier0_sanity` set is held out separately as a noise-prone diagnostic.
+
+---
+
+## Dataset
+
+This model is trained and evaluated on [**fitz-gov**](https://github.com/yafitzdev/fitz-gov), a 2,980-case benchmark for RAG governance (epistemic honesty). The eval split (584 cases) is a stratified 20% hold-out from `tier1_core` (2,920 cases, 62.7% hard difficulty, 17 domains, 113+ subcategories).
+
+fitz-gov commit at training time: `3e1d22e22fdff726330a0d70503b07f73dacf817`
+
+---
+
+## Limitations & intended use
+
+**Intended use:** as a CPU-friendly governance head inside a RAG pipeline that needs to decide when to answer, abstain, or flag a dispute. Drop-in replacement for the constraint+sklearn cascade in [fitz-sage](https://github.com/yafitzdev/fitz-sage).
+
+**Not intended for:**
+- Generating answers (this is a classification model, not a generator).
+- Token-level hallucination localization (see [LettuceDetect](https://github.com/KRLabsOrg/LettuceDetect) for that — complementary use).
+- Languages other than English. fitz-gov is English-only; multilingual variants are a v3+ consideration.
+
+**Safety axis:** the false-trustworthy rate is the production safety metric (a case wrongly classified as `TRUSTWORTHY` is the dangerous error — the system would confidently surface a hallucinated or unsupported answer). Threshold calibration is tuned to keep this rate at or below the fitz-sage baseline (5.7%).
+
+---
+
+## Citation
+
+```bibtex
+@misc{pyrrho_v1_2026,
+  title  = { pyrrho-modernbert-base-v1 },
+  author = { Yan Fitzner },
+  year   = { 2026 },
+  url    = { https://huggingface.co/yafitzdev/pyrrho-modernbert-base-v1 },
+}
+```
+
+## License
+
+Apache 2.0 — see [LICENSE](https://github.com/yafitzdev/pyrrho/blob/main/LICENSE).
+
+## Related projects
+
+- [**fitz-sage**](https://github.com/yafitzdev/fitz-sage) — production RAG library that uses this model.
+- [**fitz-gov**](https://github.com/yafitzdev/fitz-gov) — the benchmark dataset.
+- [**pyrrho**](https://github.com/yafitzdev/pyrrho) — training code and roadmap for the full model family.

config.json

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