Some Error in Environment Setup

[GuangSTrip]

In Environment Setup, it should use git clone https://github.com/wyhlovecpp/PET-Reconstruction.git to download these code. However, I have found that the /data/LRHR_dataset.py is not the correct version, which does not have the key "NHR"

[Show-han]

The repo you downloaded is a forked version. Use git clone https://github.com/Show-han/PET-Reconstruction.git.