Dragonfly can't use a Tesla (e.g., V100-PCIE-16GB) graphics card if it is the only dedicated graphics card, as it has no video output (this type of card is only used for GPU computations). Dragonfly needs a GPU card with a video output, because it requires not only GPU computations but also rendering.
If you have another dedicated video card (Nvidia or AMD) for rendering, you are able to use Dragonfly and assign the Tesla card for deep learning.