there may be a mistake

[fengxiaoshuai]

relion/src/ml_optimiser_mpi.cpp

Line 1205 in dfea290

HANDLE_ERROR(accGPUDeviceSynchronize());

cudaDeviceSynchronize() will only synchronize host with the currently set GPU, so the function just set the last device which be setted in MlDeviceBundle *b = new MlDeviceBundle(this);.