self-contained NVML probe scheduled on every alive ray node (worker envs can't import apps/, so cloudpickle carries it by value); falls back to the local host when not connected. includes ray gpu totals/available.
self-contained NVML probe scheduled on every alive ray node (worker envs can't import apps/, so cloudpickle carries it by value); falls back to the local host when not connected. includes ray gpu totals/available.