docstr: Fisher information matrix
  
  The inverse of the expected value of ``- d^2 logL / dtheta^2.``
docstr_tok: ["Fisher","information","matrix","The","inverse","of","the","expected","value","of","``","-","d^2","logL","\/","dtheta^2.","``"]
code: def information(self, theta, nuisance=None):
      """Fisher information matrix
  
      The inverse of the expected value of ``- d^2 logL / dtheta^2.``
      """
      raise NotImplementedError
  
imports: import numpy
  from nibabel.onetime import auto_attr
  from numpy.linalg import inv
  from scipy.stats import t
  from ...utils.matrices import pos_recipr
label_desc: Use image node_id 3 for calling the LikelihoodModel obj's underlying member method code with example usage: obj.information(theta, nuisance) without return types