fix bug in demo_skeleton.py (#2214)

Author: Dai-Wenxun

demo/demo_skeleton.py

@@ -170,9 +170,6 @@ def main():
 
     config = mmengine.Config.fromfile(args.config)
     config.merge_from_dict(args.cfg_options)
-    if 'data_preprocessor' in config.model:
-        config.model.data_preprocessor['mean'] = (w // 2, h // 2, .5)
-        config.model.data_preprocessor['std'] = (w, h, 1.)
 
     model = init_recognizer(config, args.checkpoint, args.device)
     result = inference_recognizer(model, fake_anno)

mmaction/apis/inference.py

@@ -37,9 +37,10 @@ def init_recognizer(config: Union[str, Path, mmengine.Config],
         raise TypeError('config must be a filename or Config object, '
                         f'but got {type(config)}')
 
-    config.model.backbone.pretrained = None
     init_default_scope(config.get('default_scope', 'mmaction'))
 
+    if config.model.backbone.get('pretrained', None):
+        config.model.backbone.pretrained = None
     model = MODELS.build(config.model)
 
     if checkpoint is not None: