This web server is used by the front-end of the application in order to interface with the image classification library.
To run it, you need to export the variable:
export FLASK_APP=run.py
or
set FLASK_APP=run.py
After exporting it, you should be good to go. The UI is pluggable, from the library.
To set a new UI for the app, go to the app/config.py file and set the STATIC_FOLDER_PATH variable to the root of the web application.