class_docstr: Base class for selection display classes.  Selection display classes are
  responsible for transforming an element (or DynamicMap that produces an
  element) into a HoloViews object that represents the current selection
  state.
class_docstr_tok: ["Base","class","for","selection","display","classes",".","Selection","display","classes","are","responsible","for","transforming","an","element","(","or","DynamicMap","that","produces","an","element",")","into","a","HoloViews","object","that","represents","the","current","selection","state","."]
code: def __call__(self, element):
      return self
  
imports: from collections import namedtuple
  import numpy
  import param
  from param.parameterized import bothmethod
  from .core.data import Dataset
  from .core.element import Element, Layout
  from .core.layout import AdjointLayout
  from .core.options import CallbackError, Store
  from .core.overlay import NdOverlay, Overlay
  from .core.spaces import GridSpace
  from .streams import CrossFilterSet, Derived, Pipe, PlotReset, SelectionExprSequence, SelectMode, Stream
  from .util import DynamicMap
label_desc: Use image node_id 1 for calling the SelectionDisplay obj's underlying member method code with example usage: obj.__call__(element) and returns: self