Hi,
I was running Lesson 1 on my mac with a GPU on the sample before trying it on AWS and I had python3 installed and ran into an error with module not found bcolz and I ran into issues installing bcolz. If you run into this issue on your mac with python3 on your laptop try the below command to install bcolz and should resolve the issue. It worked for me!
conda install -c conda-forge bcolz
With Regards
Murali