code: def grad(self):
      n = floatX(self.input_joint_matrix.shape[0])
      temperature = self.temperature
      svgd_grad = (
          self.density_part_grad / temperature
          + self.repulsive_part_grad
      )
      return svgd_grad / n
  
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 5 for calling the Stein obj's underlying member method code with example usage: obj.grad() and returns: unknown