Getting low accuracy on keras pretrained word embeddings example
The code has been changed to remove headers.  See comment on github:

"Newsgroups message contains header like 'Newsgroups: alt.atheism', which inflates the accuracy to 0.95 (2 epochs).
After removing the header, the val accuracy is 0.47 (2 epochs) and 0.71 (10 epochs)."

https://github.com/fchollet/keras/pull/5585

This confused me for days!