code: def Kxy(self):
      return self._kernel()[0]
  
file_path: pymc/pymc/variational/stein.py
imports: import pytensor.tensor
  from pytensor.graph.replace import graph_replace
  from pymc.pytensorf import floatX
  from pymc.util import WithMemoization, locally_cachedmethod
  from pymc.variational.opvi import node_property
  from pymc.variational.test_functions import rbf
label_desc: Use image node_id 8 for calling the Stein obj's underlying member method code with example usage: obj.Kxy() and returns: self