How to use the arbor.context function in arbor

# Attach a generator to the first cell in the ring.
    def event_generators(self, gid):
        if gid==0:
            sched = arbor.explicit_schedule([1])
            return [arbor.event_generator(arbor.cell_member(0,0), 0.1, sched)]
        return []

    # Define one probe (for measuring voltage at the soma) on each cell.
    def num_probes(self, gid):
        return 1

    def get_probe(self, id):
        loc = arbor.location(0, 0) # at the soma
        return arbor.cable_probe('voltage', id, loc)

context = arbor.context(threads=4, gpu_id=None)
print(context)

meters = arbor.meter_manager()
meters.start(context)

recipe = ring_recipe(10)
print(f'{recipe}')

meters.checkpoint('recipe-create', context)

decomp = arbor.partition_load_balance(recipe, context)
print(f'{decomp}')

hint = arbor.partition_hint()
hint.prefer_gpu = True
hint.gpu_group_size = 1000