code: def __add__(self, f):
      return self.vs.add(self, f)
  
imports: from __future__ import print_function
  import autograd.numpy
  import autograd.numpy.random
  from autograd.extend import primitive, defvjp, defjvp, VSpace, Box
  from autograd.util import func
  from autograd import grad
label_desc: Use image node_id 3 for calling the RKHSFun obj's underlying member method code with example usage: obj.__add__(f) and returns: self