Remove the inplace addition in FPN (#7175)

* [Fix] Fix wrong img name in onnx2tensorrt.py (#7157)

* [Docs] fix albumentations installed way (#7143)

* Remove the inplace addition in `FPN`

* update

Co-authored-by: Jamie <jamiechoi1995@users.noreply.github.com>
Co-authored-by: BigDong <yudongwang@tju.edu.cn>
Co-authored-by: PJLAB\huanghaian <1286304229@qq.com>

mmdet/models/necks/fpn.py

@@ -165,11 +165,12 @@ def forward(self, inputs):
             # In some cases, fixing `scale factor` (e.g. 2) is preferred, but
             #  it cannot co-exist with `size` in `F.interpolate`.
             if 'scale_factor' in self.upsample_cfg:
-                laterals[i - 1] += F.interpolate(laterals[i],
-                                                 **self.upsample_cfg)
+                # fix runtime error of "+=" inplace operation in PyTorch 1.10
+                laterals[i - 1] = laterals[i - 1] + F.interpolate(
+                    laterals[i], **self.upsample_cfg)
             else:
                 prev_shape = laterals[i - 1].shape[2:]
-                laterals[i - 1] += F.interpolate(
+                laterals[i - 1] = laterals[i - 1] + F.interpolate(
                     laterals[i], size=prev_shape, **self.upsample_cfg)
 
         # build outputs