code: def G_inv(self, z, alpha, beta):
      return tf.sqrt(9.0 * alpha - 3.0) * (
          (beta * z / (alpha - 1.0 / 3.0)) ** (1.0 / 3.0) - 1.0
      )
  
file_path: cornac/cornac/models/pcrl/pcrl.py
imports: import numpy
  import scipy.sparse
  import scipy
  import tensorflow
label_desc: Use image node_id 8 for calling the PCRL_ obj's underlying member method code with example usage: obj.G_inv(z, alpha, beta) and returns: unknown