A ten-question instrument for the reliability users actually perceive, rather than the accuracy measured
AspireAI community · arXiv
Automated benchmarks say nothing about how reliable a model feels to the person using it. The System Hallucination Scale borrows the form of the System Usability Scale and the System Causability Scale to measure perceived reliability across five dimensions - factual accuracy, source reliability, logical coherence, deceptiveness of presentation, and responsiveness to user guidance - using ten balanced Likert items that yield a directional score and a consistency diagnostic. In a supervised validation study with 193 participants across 386 evaluations, the scale showed strong internal consistency and high clarity, with a completion time of about 4.2 minutes. Participants rated source verifiability and presentation deceptiveness worse than factual accuracy, which points at traceability and framing as the real perceived weaknesses. The authors are explicit that this measures human-perceived reliability, not ground-truth correctness, and release multilingual implementations and a calculator.
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Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.