Use train_and_eval in WMT training scripts
export CUDA_VISIBLE_DEVICES=0,1,2,3
-PYTHONPATH=../.. python -m bin.main train \
+PYTHONPATH=../.. python -m bin.main train_and_eval \
--model ../../config/models/transformer.py \
--config config/wmt_ende.yml \
--num_gpus 4
