Currently, when we perform unit test assertions we do something like:

left = naive.stump(T, m)
right = stumpy.stump(T, m)

np.assert_almost_equal(left, right)

However,left and right are also overloaded since we have left and right matrix profiles and indices. It has been proposed that we replace left with ref instead and either replace right or just name it appropriate

improve HarmonicNumber implementation:
https://github.com/axkr/symja_android_library/blob/master/symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/builtin/Arithmetic.java#L1825

• https://en.wikipedia.org/wiki/Harmonic_number
• https://medium.com/cantors-paradise/the-celebrated-harmonic-numbers-and-how-to-approximate-them-b8747a4efeec