Unable to figure out URL for PaperGenerationProblem.py line 20

[ammaarahmad1999]

1. Unable to figure out URL for t2t_paper_generation_problem/PaperGenerationProblem.py line 20

2. Also if a run the file t2t_paper_generation_problem/train.py it shows the following error.
   sh: 1: t2t-trainer: not found
   --> Train Completed. Files saved at experiment/transformer/transformer_small
   What is t2t-trainer?

3. Even in transformers-xl folder few files are missing
   base.sh
   bash getdata.sh

4. And what is --work_dir in
   bash run_papers_base.sh train --work_dir PATH_TO_WORK_DIR.

Please Clarify as soon as possible