Could not get the file at http://www.quest.dcs.shef.ac.uk/wmt16_files_mmt/training.tar.gz. [RequestE

if you do not want to update the URL of multi30k, you can just download the file from url above and put the tar.gz file to the torch cache directory. for my machine, the directory is :/root/.cache/torch/text/datasets/Multi30k , copy the tar.gz file into directory ,and run the code.
压缩文件可从以下链接下载：https://share.weiyun.com/wvtbBVWS
或者自行从github上下载：https://github.com/neychev/small_DL_repo/tree/master/datasets/Multi30k

并将三个文件放在/root/.cache/torch/text/datasets/Multi30k（本目录根据个人有所变化）