RuntimeError: copy_if failed to synchronize: device-side assert triggered

[Crystal950504]

File "train_refinedet.py", line 289, in
train()
File "train_refinedet.py", line 203, in train
odm_loss_l, odm_loss_c = odm_criterion(out, targets)
File "/home/shaoyidu/Program/anaconda3/envs/pytorch/lib/python3.6/site-packages/torch/nn/modules/module.py", line 491, in call
result = self.forward(*input, **kwargs)
File "/home/shaoyidu/Program/LH/RefineDet.PyTorch/layers/modules/refinedet_multibox_loss.py", line 127, in forward
loss_c[pos.view(-1,1)] = 0 # filter out pos boxes for now
RuntimeError: copy_if failed to synchronize: device-side assert triggered