subsample()->prepare_targets() : for proposals_per_image, targets_per_image in zip(proposals, targets): TypeError: 'NoneType'

[ZhuangTingT]

hello,
error:
subsample()->prepare_targets() : for proposals_per_image, targets_per_image in zip(proposals, targets): TypeError: 'NoneType'
I met the error in fcos_core/modeling/roi_heads/box_head/loss.py line 55,
it seems the targets were not input, i find the dataloader only load sigle dataset**(in
fcos_core/data/build.py def build_dataset())** during training. Is it the reason?
How can i fix it?

ps:
In fcos_core/modeling/roi_heads/box_head/roi_box_feature_extractors.py around line 28, I changed head = resnet.ResNetHead to head = resnet.ResNet(config), is it right? Does the change caused the error above?

thanks, waiting for your reply!

[SXYSUOSUO]

Hello! Have you solved it yet? I also encountered the same problem, the "proposals" is None