On the first day, I skimmed through the first seven chapters and started looking at the code in chapter eight, reading line by line the initial part of the pneumonia classification model training code. Whenever I encountered something I didn’t understand, I went back to review the relevant sections from the first seven chapters.
Not to mention, I learned a lot about argparse 
, and spent some time rewriting the previous rimetool.
I also submitted a PR for the tutorial; I’m not sure if it will be accepted.