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[BE][Ez]: Update Eigen to 5.0.0. C++14 support and more! (#165840)
Update Eigen pin to 5.0.0 . Tons of new features and perf improvements. Most importantly updates minimum from C++03 to C++14 giving a ton of performance optimizations like properly implemented move operators, simplified code, etc. Also improved vectorization particularily on ARM. We really only use this library as a fallback for sparse operators, but still useful to update it. Pull Request resolved: https://github.com/pytorch/pytorch/pull/165840 Approved by: https://github.com/albanD
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