diff --git a/pcdet/models/backbones_2d/__init__.py b/pcdet/models/backbones_2d/__init__.py
new file mode 100644
index 0000000..fea8d16
--- /dev/null
+++ b/pcdet/models/backbones_2d/__init__.py
@@ -0,0 +1,7 @@
+from .base_bev_backbone import BaseBEVBackbone, BaseBEVBackboneV1, BaseBEVResBackbone
+
+__all__ = {
+    'BaseBEVBackbone': BaseBEVBackbone,
+    'BaseBEVBackboneV1': BaseBEVBackboneV1,
+    'BaseBEVResBackbone': BaseBEVResBackbone,
+}