Chitthi: A Séance Where the Ghost Can Only Quote Itself

说明与用途

Chitthi 让用户向历史人物提问，答案仅来自原始信件的逐字引用，保证真实性和透明度，并完全离线运行。

问题

Historical figure chatbots often generate fabricated quotes, undermining authenticity. Users need a system that answers only with verbatim passages from original letters.

结果

Chitthi delivers authentic, verifiable answers from scanned letters, avoiding fabricated content. It runs entirely offline on a laptop, uses open models, and provides citations and original scans for transparency.

工作流

• Scan PDF/image/text → render pages with pypdfium2 or Gemma 4 vision → extract passages (≤900 chars, page‑bound) → embed passages with EmbeddingGemma and index in SQLite FTS5 → receive user question → semantic search + exact‑word search → Gemma 4 generates answer in archivist or séance mode → checker verifies quoted spans against passages → UI displays answer, highlights verified quotes, flags missing quotes, links to original scan

证据

Chitthi reads scanned letters page by page, indexes them on your own machine, and answers only from the passages it retrieves

来源

Every quoted phrase is checked word-for-word against the letters. Verified quotes are highlighted; a quote that isn't in the letters is flagged.

来源

Everything in the demo is the real app running against Gemma 4 on a 16 GB M4 Mac. The only edit is cutting the 40 to 60 seconds Gemma takes to think.

来源