class_docstr: requires theta >=1
class_docstr_tok: ["requires","theta",">","=1"]
code: def deriv(self, t, theta):
      return -theta * (-np.log(t)) ** (theta - 1) / t
  
imports: import warnings
  import numpy
  from scipy.special import expm1, gamma
label_desc: Use image node_id 4 for calling the TransfGumbel obj's underlying member method code with example usage: obj.deriv(t, theta) and returns: unknown