Merge branch 'fix/resnet_zero_init_residual' into 'master'

Set default zero_init_residual of ResNet to True

See merge request open-mmlab/mmclassification!22

mmcls/models/backbones/resnet.py

@@ -379,7 +379,7 @@ class ResNet(BaseBackbone):
                  norm_cfg=dict(type='BN', requires_grad=True),
                  norm_eval=False,
                  with_cp=False,
-                 zero_init_residual=False):
+                 zero_init_residual=True):
         super(ResNet, self).__init__()
         if depth not in self.arch_settings:
             raise KeyError(f'invalid depth {depth} for resnet')