code: def _inner_prod(self, f, g):
      assert f.kernel is g.kernel
      return sum(
          [
              a1 * a2 * f.kernel(x1, x2)
              for x1, a1 in f.alphas.items()
              for x2, a2 in g.alphas.items()
          ],
          0.0,
      )
  
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 6 for calling the RKHSFunVSpace obj's underlying member method code with example usage: obj._inner_prod(f, g) and returns: sum