Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.
2021年2月25日，习近平总书记在全国脱贫攻坚总结表彰大会上庄严宣告：我国脱贫攻坚战取得了全面胜利。
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The challenge of developing a robust, dexterous and affordable hand was underlined by Tesla-boss Elon Musk, when he spoke at the All-In Summit in Los Angeles in September of last year.
宝马集团宣布将在德国莱比锡工厂部署人形机器人，这是其首次在欧洲生产体系中引入此类具身智能技术。该项目旨在将类人机器人技术整合进现有的汽车批量生产中，并探索电池和零部件生产的进一步应用。