Fix SSD512 config error (#6574)

* Fix mosaic repr typo (#6523)

* Include mmflow in readme (#6545)

* Include mmflow in readme

* Include mmflow in README_zh-CN

* Add mmflow url into the document menu in docs/conf.py and docs_zh-CN/conf.py.

* Make OHEM work with seesaw loss (#6514)

* Fix ssd512 config error

Co-authored-by: Kyungmin Lee <30465912+lkm2835@users.noreply.github.com>
Co-authored-by: Czm369 <40661020+Czm369@users.noreply.github.com>
Co-authored-by: ohwi <supebulous@gmail.com>

configs/pascal_voc/ssd512_voc0712.py

@@ -1,6 +1,11 @@
 _base_ = 'ssd300_voc0712.py'
 input_size = 512
 model = dict(
+    neck=dict(
+        out_channels=(512, 1024, 512, 256, 256, 256, 256),
+        level_strides=(2, 2, 2, 2, 1),
+        level_paddings=(1, 1, 1, 1, 1),
+        last_kernel_size=4),
     bbox_head=dict(
         in_channels=(512, 1024, 512, 256, 256, 256, 256),
         anchor_generator=dict(