Add config to runner meta (#3534)

* Add config and config filename to runner meta

* Add absolute path of config file

* change from realpath to abspath

* Use copy.deepcopy

* Use config instead of config_dict.

tools/train.py

@@ -130,7 +130,7 @@ def main():
     logger.info('Environment info:\n' + dash_line + env_info + '\n' +
                 dash_line)
     meta['env_info'] = env_info
-
+    meta['config'] = cfg.pretty_text
     # log some basic info
     logger.info(f'Distributed training: {distributed}')
     logger.info(f'Config:\n{cfg.pretty_text}')
@@ -156,7 +156,6 @@ def main():
         # checkpoints as meta data
         cfg.checkpoint_config.meta = dict(
             mmdet_version=__version__ + get_git_hash()[:7],
-            config=cfg.pretty_text,
             CLASSES=datasets[0].CLASSES)
     # add an attribute for visualization convenience
     model.CLASSES = datasets[0].CLASSES