Transfer learning with mbart

I am using the mbart model as a pretrained model for machine translation with Target language not existing in the list of dicts.
Is it possible to use train_from (with opennmt_py) and finetune it on different languages?
I keep getting this error:
fields = checkpoint[‘vocab’]
KeyError: ‘vocab’

Any advice?

I believe the answer is in this topic:


Thanks Samuel!

I think that the topic you are referring to is fine-tuning for a language pair that is already available in MBART. Is there any additional steps that needs to be done to fine-tune for a new language pair or to add a new Target language as @cha mentioned?