How to add bleu or accuracy on nmt task?

[only sainaa (only_sainaa)]

#here is my code

#i use subprocess to train, then the problem is i can not add --eval-bleu

#everytime i add bleu score line, it throws an unknown error,

#and i did not find any accuracy metrics in fairseq. where can i add

#custom accuracy or how can i run training code with bleu score? I think

#ppl score is not efficient like bleu or accuracy.

import subprocess

# Train each model in the ensemble

command = [

    'python3',

    'fairseq/train.py',

    '--optimizer', 'adam',

    '--lr', '5e-5',

    '--min-lr', '5e-10',

    '--lr-shrink', '0.5',

    '--max-tokens', '1000',

    '--arch', 'transformer',

    '--clip-norm', '0.5',

    '--max-epoch', '30',

    '--save-dir', 'my_test_checkpoint/cyrillic2bichig2',

    'cyrillic2bichig-bin'

]

subprocess.run(command)