Former-commit-id: ce020b6eb3f35c1db37ee4835e694eddcd0f59b0
* easily resume from checkpoint * support full and freeze checkpoints * faster ui Former-commit-id: 84cfb2452cc86b037ccddee6e833f8eb7c129fa4
Former-commit-id: a07ff0c083558cfe6f474d13027642d3052fee08