AttributeError: 'DGP_VI' object has no attribute 'init_op'

[izsahara]

I understand this implementation of DGP is old, but my aim is to study these models especially IWVI (GPFlux has yet to provide a simple example although the implementation is in progress)
in the run_conditional_density_estimation.py after making the model, there is a model.init_op(sess) is this a function thats supposed to be in the DGP model or is it from GPflow?

im using GPflow 1.3 and Tensorflow 1.13

Thanks