Show HN: TopoVoid-0.2B – Closed-form weight writing in concept null space

Category: ai-ml

Tags: concept-bottleneck, weight-editing, language-model, null-space, closed-form

Score: 7.0/10 (Innovation: 8, Technical: 8, Documentation: 7, Utility: 5)

TopoVoid-0.2B is a 212M-parameter research preview that introduces explicit concept bottleneck layers and a closed-form solver to write new facts directly into the orthogonal null space of those layers, avoiding gradient-based fine-tuning. It demonstrates strong performance on CounterFact and AG News, but faces practical limitations in multi-module stacking and relies on a narrow evaluation scope.

Target audience: AI researchers, ML engineers

Repository: https://huggingface.co/Topovoid/TopoVoid-0.2B-Orthogonal-Preview

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