CUDA<- CPU interface for 3D

CUDA<- CPU interface for 3D: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Right now, all this could do is throw and error if the input to forward() is not compatible (i.e., sending a CPU tensor to a Scattering3D object that is in CUDA mode, or vice versa), but…