Benchmark against eigen, xtensor, blaze, ...

[breznak]

Would be nice to include some benchmarks against another matrix/linalg libraries, such as Eigen, xtensor, numpy (py version), blaze, ...

[dman82499]

I second this, would be really nice even if only 1-2 comparisons of those libraries were made.

[kaixiongg]

also, benchmark with python numpy?