Return the specified backend module used for the spherical harmonic transforms in pyshtools.
Usage
module = backend_module([backend, nthreads])
Parameters
backend : str, optional, default = preferred_backend() Name of the preferred backend, either ‘shtools’ or ‘ducc’.
nthreads : int, optional, default = 1 Number of threads to use for the ‘ducc’ backend. Setting this parameter to 0 will use as many threads as there are hardware threads on the system.
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