For the Vitis AI development kit v3.0 release, VART-based examples demonstrate the use of the Vitis AI unified C++/Python APIs (which are available across Cloud-to-Edge).
These samples can be found at https://github.com/Xilinx/Vitis-AI/tree/v3.0/examples/vai_runtime. If you are using Xilinx ZCU102 and ZCU104 boards to run samples, make sure to enable X11 forwarding with the "ssh -X" option, or the command export DISPLAY=192.168.0.10:0.0 (assuming the IP address of host machine is 192.168.0.10), when logging in to the board using an SSH terminal, as all the examples require X11 to work properly.
Note: The examples will not work through a UART connection due to the lack of X11 support. Alternatively, you can connect boards with a monitor directly instead of using the Ethernet.