def reverse_dict(d):
    result = {}
    for key in d:
        for val in d[key]:
            result[val] = result.get(val, tuple()) + (key, )
    return result
Spherical harmonic of order `m` and degree `n`.
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/gof/sched.py/reverse_dict--crossover with--dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/directivity.py/spherical_harmonic