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Faster comparison operators
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The comparison functions (``numpy.equal``, ``numpy.not_equal``, ``numpy.less``,
``numpy.less_equal``, ``numpy.greater`` and ``numpy.greater_equal``) are now
much faster as they are now vectorized with universal intrinsics. For a CPU
with SIMD extension AVX512BW, the performance gain is up to 2.57x, 1.65x and
19.15x for integer, float and boolean data types, respectively (with N=50000).
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