* easily resume from checkpoint * support full and freeze checkpoints * faster ui Former-commit-id: 84cfb2452cc86b037ccddee6e833f8eb7c129fa4
Former-commit-id: 66d72b263d36dc81de9f6152077663b613035977
Former-commit-id: a07ff0c083558cfe6f474d13027642d3052fee08