fix a bug in basicblock (#576)

* fix a bug in basicblock

* fix padding and dilation in basic block

* remove stride and dilation in conv2

mmdet/models/backbones/resnet.py

@@ -46,9 +46,7 @@ class BasicBlock(nn.Module):
             planes,
             planes,
             3,
-            stride=stride,
-            padding=dilation,
-            dilation=dilation,
+            padding=1,
             bias=False)
         self.add_module(self.norm2_name, norm2)