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Update on "RFC: Unbreak torch.is_vulkan_available() on Mac"
I am a Vulkan noob, but this extension and flag seem to be necessary. See "Encounted VK_ERROR_INCOMPATIBLE_DRIVER" at https://vulkan-tutorial.com/Drawing_a_triangle/Setup/Instance .
(For anyone trying to repro at home, I have the following homebrew packages installed, not all of which may be necessary: molten-vk, vulkan-headers, vulkan-loader, vulkan-tools, vulkan-utility-libraries. I also have VK_ICD_FILENAMES set to /opt/homebrew/etc/vulkan/icd.d/MoltenVK_icd.json, and I built PyTorch with USE_VULKAN=1. Making sure vkcube works helped me debug this setup.)
Pull-Request-resolved: #153776
[ghstack-poisoned]
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