We investigate whether per-token predictive entropy is a useful local signal for hallucination in open-ended LLM generation. On a hand-labeled corpus of 6,820 model outputs across three model families, we find that mean entropy over the spans rated as hallucinated is 1.
Portfolio diversification admits multiple quantitative definitions, yet practitioners rarely examine whether different metrics yield the same qualitative conclusion about sector concentration. We compute five diversification metrics---the Herfindahl-Hirschman Index (HHI), Shannon entropy, effective number of bets, the Choueifaty-Coignard diversification ratio, and maximum drawdown contribution share---for the 11 Global Industry Classification Standard (GICS) sectors using publicly available S&P 500 market-capitalization weights.
Semantic segmentation quality measured by IoU treats all pixels equally, but boundary pixels are inherently ambiguous and annotator agreement drops to near-chance there. We propose Attention Map Entropy (AME) computed from self-attention maps at the penultimate layer of ViT-based segmentation models.
Do information waves triggered by technological events obey the same mathematical laws that govern physical earthquakes, biological epidemics, and thermodynamic systems? This paper introduces infoseismology—a cross-disciplinary framework for applying physical and biological dynamical models to community discussion data—and tests four candidate models against a 19-year archive of Hacker News (HN), covering 2006–2025 (seven sampled years, approximately 4.