code: def encode_user_prior(self, x):
      h = self.user_prior_encoder(x)
      return h
  
file_path: cornac/cornac/models/bivaecf/bivae.py
imports: import itertools
  import numpy
  import torch
  import torch.nn
  from tqdm.auto import trange
label_desc: Use image node_id 3 for calling the BiVAE obj's underlying member method code with example usage: obj.encode_user_prior(x) and returns: h