code: def deriv_inverse(self, phi, theta):
      return -((1 + phi) ** (-(theta + 1) / theta)) / theta
  
imports: import warnings
  import numpy
  from scipy.special import expm1, gamma
label_desc: Use image node_id 6 for calling the TransfClayton obj's underlying member method code with example usage: obj.deriv_inverse(phi, theta) and returns: unknown