mmdetection代码阅读系列（三）：整个代码训练的流程 build_from_cfg, Runner, Hook
程序的入口mainparseconfig,creatework_dir,disttrain,collectenvbuild_datasetoftrainbuild_detectortrain_detectorbuild_dataloaderbuild_optimizercreatedistmodelbuild_runnerrunner.register_hookRunner.runrunner.c