As one of the largest contributors to PMLR volumes, ICML changes its global host city annually:
The Proceedings of Machine Learning Research (PMLR) occupies a unique and influential location in the scientific landscape—not as a single physical building or campus, but as a decentralized digital archive that serves the global machine learning community. Unlike traditional academic journals housed in university libraries or press offices, PMLR exists primarily online, with its "location" defined by three key domains: its official website, leading research repositories, and the major conferences it supports. pmlr location