m                  language model trained in step 2
            │   ├── fwd             forward model
            │   ├── bwd             backwards model
            │   └── spm             SentencePiece model
            │
            ├── ft                  fine tuned model trained in step 3
            │   ├── fwd             forward model
            │   ├── bwd             backwards model
            │   └── spm             SentencePiece model
   