I have a fairly optimized cnn-blstm-crf tagger here 4 with the crf defined here 6.
On pytorch 0.4.0 using cuda 9.0 and cudnn 7102 I can run a single epoch of the conll 2003 NER task in 21.41 +/- 0.28
When the only thing I change is the version of pytorch to 0.4.1 (the current conda install) a single epoch now takes  27.99 +/-  0.26
Has anyone else noticed anything like this?