What should be in the file -- 'data/chairs/train.txt' ?

Hi, I'm trying to re-implement your work and am running into some confusion.
It seems like the file 'data/chairs/train.txt' is being called in train_hybrid_progressive_gan.py, but I don't see where this file is generated (or any writeup about how to generate it yourself). I followed the data preprocessing steps as was outlined - any pointers would be helpful!