code: def update_beta(self):
      self.beta = self.phi_sum / self.phi_sum.sum(0)
      self.phi_sum = np.zeros([self.n_vocab, self.k]) + self.eta
  
file_path: cornac/cornac/models/ctr/ctr.py
imports: import numpy
  from ...utils import get_rng
label_desc: Use image node_id 3 for calling the Model obj's underlying member method code with example usage: obj.update_beta() without return types