code: def __init__(
      self, approx, kernel=rbf, use_histogram=True, temperature=1
  ):
      self.approx = approx
      self.temperature = floatX(temperature)
      self._kernel_f = kernel
      self.use_histogram = use_histogram
  
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 1 to create a new Stein object from inherited base classes: WithMemoization with example: obj = Stein(approx, kernel, use_histogram, temperature)