[Feature] save config file in print_config.py (#9276)

* Add feature to save config file in print_config.py

Add feature to print_config.py to save configuration files

* Update print_config.py

* Update print_config.py

* Update tools/misc/print_config.py

Co-authored-by: BigDong <yudongwang1226@gmail.com>

* Format

* Update print_config.py

* add suffix check

* Update tools/misc/print_config.py

Co-authored-by: RangiLyu <lyuchqi@gmail.com>

Co-authored-by: BigDong <yudongwang1226@gmail.com>
Co-authored-by: BIGWangYuDong <yudongwang@tju.edu.cn>
Co-authored-by: RangiLyu <lyuchqi@gmail.com>

tools/misc/print_config.py

@@ -1,5 +1,6 @@
 # Copyright (c) OpenMMLab. All rights reserved.
 import argparse
+import os
 
 from mmengine import Config, DictAction
 
@@ -9,6 +10,10 @@
 def parse_args():
     parser = argparse.ArgumentParser(description='Print the whole config')
     parser.add_argument('config', help='config file path')
+    parser.add_argument(
+        '--save-path',
+        default=None,
+        help='save path of whole config, suffixed with .py, .json or .yml')
     parser.add_argument(
         '--cfg-options',
         nargs='+',
@@ -39,6 +44,17 @@ def main():
         cfg.merge_from_dict(args.cfg_options)
     print(f'Config:\n{cfg.pretty_text}')
 
+    if args.save_path is not None:
+        save_path = args.save_path
+
+        suffix = os.path.splitext(save_path)[-1]
+        assert suffix in ['.py', '.json', '.yml']
+
+        if not os.path.exists(os.path.split(save_path)[0]):
+            os.makedirs(os.path.split(save_path)[0])
+        cfg.dump(save_path)
+        print(f'Config saving at {save_path}')
+
 
 if __name__ == '__main__':
     main()