Hi @Max, I think the source of your error is that you’re missing some line-break characters \ in your cmd string. In other words, put a backslash at the end of each line in the script command:
python run_mlm.py \
--output_dir {0} \
--model_name_or_path roberta-base \
...

There might also be something quirky happening with the string formatting, so I’d check that it makes sense by printing out the cmd string