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Nvidia bans using translation layers for CUDA software
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
It's not about it being fast, it's about it only being available for NVidia GPUs. As long as software for things like machine learning uses CUDA, you need to buy an NVidia GPU to use it. A translation layer would let you use the same software on other companies' GPUs, which means people aren't forced to buy NVidia's GPUs anymore.