code: def deriv2(self, t, *args):
      t = np.asarray(t)
      return 1.0 / t**2
  
imports: import warnings
  import numpy
  from scipy.special import expm1, gamma
label_desc: Use image node_id 4 for calling the TransfIndep obj's underlying member method code with example usage: obj.deriv2(t) and returns: unknown