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Some Ubuntu 20.04 images come with PyYAML 5.3.1 pre-installed through distutils. This makes pip very angry. See https://github.com/yaml/pyyaml/issues/349. Since older versions of PyYAML should work for mlir, relax the version requirement to ease developer setup. Reviewed By: stellaraccident Differential Revision: https://reviews.llvm.org/D143523