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----
-title: groundlens — Hallucination Detection Demo
-emoji: 📐
-colorFrom: yellow
-colorTo: red
-sdk: gradio
-sdk_version: 5.33.0
-app_file: app.py
-pinned: true
-license: mit
-tags:
-- hallucination-detection
-- llm-evaluation
-- rag
-- grounding
-- nlp
-- groundlens
-- embedding-geometry
-short_description: Geometric LLM hallucination detection. No second LLM.
----
-
-[![PyPI](https://img.shields.io/pypi/v/groundlens?style=flat-square)](https://pypi.org/project/groundlens/)
-[![GitHub](https://img.shields.io/github/stars/groundlens-dev/groundlens?style=flat-square)](https://github.com/groundlens-dev/groundlens)
-
-# groundlens — Hallucination Detection Demo
-
-Detects LLM hallucinations using embedding geometry. No second LLM. Deterministic. Auditable.
-Benchmarked against [Vectara HHEM-2.1-Open](https://huggingface.co/vectara/hallucination_evaluation_model).
-
-## Methods compared
-
-**groundlens SGI** (with context): ratio of Euclidean distances on the embedding space —
-`dist(response, question) / dist(response, context)`. No model inference for
-the evaluation. One embedding call, one division.
-
-**groundlens DGI** (without context): cosine similarity between the response
-displacement vector and the mean displacement of verified grounded pairs.
-
-**HHEM-2.1-Open** (Vectara): fine-tuned flan-T5 classifier. Full model
-inference per evaluation call.
-
-## When they disagree
-
-Disagreement surfaces **Type III hallucinations** — factual errors within
-a correct semantic frame. Embedding geometry cannot detect these: the
-response occupies the geometrically correct region of the space despite
-being factually wrong. HHEM's classifier may catch some of these cases.
-The two methods are orthogonal signals, not competing alternatives.
-
-## Install the library
-
-```bash
-pip install groundlens
-```
-
-## Links
-
-- [GitHub](https://github.com/groundlens-dev/groundlens)
-- [Documentation](https://docs.groundlens.dev)
-- [PyPI](https://pypi.org/project/groundlens/)
-- [Website](https://groundlens.dev)
-
-## Research
-
-- [Semantic Grounding Index — arXiv:2512.13771](https://arxiv.org/abs/2512.13771)
-- [Geometric Taxonomy of Hallucinations — arXiv:2602.13224v3](https://arxiv.org/pdf/2602.13224v3)
-- [Rotational Dynamics of Factual Constraint Processing — arXiv:2603.13259](https://arxiv.org/abs/2603.13259)