Can I use PyTorch within the objective function?

[yifeng-li]

Hi,
Before I start writing my coding with GPflowOpt, I need to check with you whether I can use a PyTorch model within the objective function? My objective function needs the decoder of a VAE defined using PyTorch. In addition to other essential parameters, I want to pass this model as one parameter to the objective function. I understand that GPflowOpt is based on TF, but I am not sure whether the objective can be any function independent of TF.
Thanks in advance...