def run_controller()

in horovod/runner/launch.py [0:0]

• 32 lines of code
• 13 McCabe index (conditional complexity)

def run_controller(use_gloo, gloo_run, use_mpi, mpi_run, use_jsrun, js_run, verbosity):
    # keep logic in sync with is_gloo_used(...)
    verbose = verbosity is not None and verbosity >= 2
    if use_gloo:
        if not gloo_built(verbose=verbose):
            raise ValueError('Gloo support has not been built.  If this is not expected, ensure CMake is installed '
                             'and reinstall Horovod with HOROVOD_WITH_GLOO=1 to debug the build error.')
        gloo_run()
    elif use_mpi:
        if not mpi_built(verbose=verbose):
            raise ValueError('MPI support has not been built.  If this is not expected, ensure MPI is installed '
                             'and reinstall Horovod with HOROVOD_WITH_MPI=1 to debug the build error.')
        mpi_run()
    elif use_jsrun:
        if not mpi_built(verbose=verbose):
            raise ValueError('MPI support has not been built.  If this is not expected, ensure MPI is installed '
                             'and reinstall Horovod with HOROVOD_WITH_MPI=1 to debug the build error.')
        if not lsf.LSFUtils.using_lsf():
            raise ValueError(
                'Horovod did not detect an LSF job.  The jsrun launcher can only be used in that environment. '
                'Please, pick a different launcher for other environments.')
        js_run()
    else:
        if mpi_built(verbose=verbose):
            if lsf.LSFUtils.using_lsf() and is_jsrun_installed():
                js_run()
            else:
                mpi_run()
        elif gloo_built(verbose=verbose):
            gloo_run()
        else:
            raise ValueError('Neither MPI nor Gloo support has been built. Try reinstalling Horovod ensuring that '
                             'either MPI is installed (MPI) or CMake is installed (Gloo).')