        downloaded Wikipedia dump
        │   └── extract             extracted wikipedia-articles using wikiextractor
        ├── docs 
        │   ├── all                 all extracted Wikipedia articles as single txt-files
        │   ├── sampled             sampled Wikipedia articles for language model pretraining
        │   └── sampled_tok         cached tokenized sampled articles - created by fastai / sentencepiece
        └── model 
            ├── l