Function get_4k_model_path 

pub fn get_4k_model_path() -> PathBuf

The VMAF 4K model.

This internally creates a temporary file that lasts for the duration of th process. The temporary file is automatically removed at the end of the process (or presumably by the OS following a reboot).

This is a relatively cheap operation in the sense that this only happens once. All subsequent calls point to the original file (i.e. this is an idempotent operation).