difference result with different version mmdetection3d

[AndyYuan96]

Hi, I want to try transfusion with mmdet3d 1.0, and transfusion's repo use mmdet3d 0.11, and I copy the transfusion head and boxencoder to mmdet3d 1.0. But I can't reproduce the result with 1/5 data, when use mmdet3d 1.0, the performance drop about 2 point in map and nds. after some experiment, I find when I use init weight from mmdet3d 0.11 to train transfusion with mmdet3d 1.0, the performance don't drop. So I just don't why init function will have so much difference on detector, so I just wonder whether your guys have any advise?
the init function change comes from here: #378

[ZCMax]

To unify the parameter initialization in OpenMMLab projects, MMCV supports BaseModule that accepts init_cfg to allow the modules' parameters initialized in a flexible and unified manner. Now the users need to explicitly call model.init_weights() in the training script to initialize the model (as in here, previously this was handled by the detector. Please refer to PR #622 for details. Did you use BaseModule instead of nn.Module while migrating the transfusion head and boxencoder to mmdet3d 1.0?

[AndyYuan96]

To unify the parameter initialization in OpenMMLab projects, MMCV supports BaseModule that accepts init_cfg to allow the modules' parameters initialized in a flexible and unified manner. Now the users need to explicitly call model.init_weights() in the training script to initialize the model (as in here, previously this was handled by the detector. Please refer to PR #622 for details. Did you use BaseModule instead of nn.Module while migrating the transfusion head and boxencoder to mmdet3d 1.0?

no, I don't use base module instead of nn.module. and I think it's not related to that, as after I change the default init cfg=None of second and secondfpn, and use mmdet3d 0.11's init_weight function, the loss curve looks right, it's almost the same with mmdet3d 0.11's loss curve. but with mmdet3d 1.0's init_cfg of second and second fpn, the loss curve is always higher than mmdet3d0.11.

[BoomSky0416]

@AndyYuan96 Hello, I encountered the same performance drop during reproducing transfusion in the latest mmdet3d. Could you show me how to modify the initialization of second and secondfpn? Thanks!

[xtk8532704]

I also encountered the same problem when reproducing transfusion.