To interpret a 2D sketch, run s2g_main in code directory after installing dependencies. File paths are absolute so convert to work with your machine.
To set up a scene, install Unreal Engine 4 and Houdini 18.5 Python3, and Houdini Engine Plugin. Add the HDA to your scene, and create a directory of actors with the same names as the trained labels. Code must be added to your houdini directory under Python3._ libs. Documentation for running external Python within Houdini this found on Houdini docs. Additional setup may be required to import external python dependencies not bundled with Houdini.