code: def deriv2_inverse(self, phi, theta):
      return ((theta + 1) * (1 + phi) ** (-1 / theta - 2)) / theta**2
  
imports: import warnings
  import numpy
  from scipy.special import expm1, gamma
label_desc: Use image node_id 7 for calling the TransfClayton obj's underlying member method code with example usage: obj.deriv2_inverse(phi, theta) and returns: unknown