class_docstr: Add a random displacement of maximum size `stepsize` to each coordinate
  
  Calling this updates `x` in-place.
  
  Parameters
  ----------
  stepsize : float, optional
      Maximum stepsize in any dimension
  random_state : None or `np.random.RandomState` instance, optional
      The random number generator that generates the displacements
code: def __call__(self, x):
      x += self.random_state.uniform(
          -self.stepsize, self.stepsize, np.shape(x)
      )
      return x
  
imports: from __future__ import division, print_function, absolute_import
  import numpy
  import math
  from numpy import cos, sin
  import scipy.optimize
  from scipy._lib._util import check_random_state
label_desc: Use image node_id 2 for calling the RandomDisplacement obj's underlying member method code with example usage: obj.__call__(x) and returns: x