code: def log_r(self, epsilon, alpha, beta):
      return -tf.log(self.dG(epsilon, alpha, beta)) + self.log_t(
          epsilon
      )
  
file_path: cornac/cornac/models/pcrl/pcrl.py
imports: import numpy
  import scipy.sparse
  import scipy
  import tensorflow
label_desc: Use image node_id 7 for calling the PCRL_ obj's underlying member method code with example usage: obj.log_r(epsilon, alpha, beta) and returns: unknown