状态空间模型:通过代码解析
本文通过代码示例深入浅出地解释了状态空间模型(State Space Models, SSMs)的核心概念,包括状态表示、状态转移方程与观测方程。文章结合Python代码,展示了如何在实践中构建和模拟SSM,帮助读者理解这类模型在时间序列分析、控制系统等领域的应用原理。
本文通过代码示例深入浅出地解释了状态空间模型(State Space Models, SSMs)的核心概念,包括状态表示、状态转移方程与观测方程。文章结合Python代码,展示了如何在实践中构建和模拟SSM,帮助读者理解这类模型在时间序列分析、控制系统等领域的应用原理。
A state-designed worm from 2005 called Fast16 sat undetected on VirusTotal for nearly a decade. It intercepted executable files at the kernel level and silently altered floating-point calculations in high-precision engineering software like LS-DYNA, which was used in Iran's nuclear weapons research. Unlike Stuxnet, Fast16 received little public attention for over twenty years.
Paul Graham reports that Y Combinator startups now have over 75% of their code written by AI, a threshold crossed at least one to two years ago. This parallels a similar transformation at Google, where AI-written code went from 0% to 75% in about two years.
Scientists are increasingly concerned about the potential collapse of the Atlantic Meridional Overturning Circulation (AMOC), a critical ocean current system. Such a collapse could have severe consequences for North America and Europe.
A compromised version of the LiteLLM Python package (version 1.82.8) was briefly available on PyPI, capable of exfiltrating sensitive credentials like SSH keys and cloud secrets. The malicious package affected any project that depended on LiteLLM, though it was only available for about an hour before discovery.
A supply chain attack has compromised the popular npm axios HTTP client library with 300 million weekly downloads. Malicious versions install a remote access trojan, though some users may have avoided infection through version pinning or older installations. Security experts warn this is a live compromise affecting one of npm's most depended-on packages.