New algorithm for get_conjugacy_class()

[yaniccd]

get_conjugacy_class() was the primary bottleneck of haar_integral_unitary(). The algorithm has been drastically improved.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
haarpy/orthogonal.py	100.00% <ø> (ø)
haarpy/symmetric.py	100.00% <100.00%> (ø)
haarpy/symplectic.py	100.00% <ø> (ø)
haarpy/tests/test_symmetric.py	100.00% <100.00%> (ø)
haarpy/tests/test_unitary.py	100.00% <100.00%> (ø)
haarpy/unitary.py	100.00% <100.00%> (ø)

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[nquesada]

Could you post some little code and a little benchmark showing how significant are the changes?
Something along the lines of

%timeit get_conjugacy_class() #running from the main branch
# Takes crazy long

and then

%timeit get_conjugacy_class() #running from this branch
# Blazingly fast?

[yaniccd]

Could you post some little code and a little benchmark showing how significant are the changes? Something along the lines of

%timeit get_conjugacy_class() #running from the main branch
# Takes crazy long

and then

%timeit get_conjugacy_class() #running from this branch
# Blazingly fast?

The time difference has a major impact on haar_integral_unitary which has many calls to this function.

The old function :

The new one :

[nquesada]

Some minor tweak in the changelog.