code: def _hover_opts(self, element):
      if self.inspection_policy == "nodes":
          dims = element.nodes.dimensions()
          dims = [(dims[2].pprint_label, "@{index_hover}")] + dims[3:]
      elif self.inspection_policy == "edges":
          kdims = [
              (kd.pprint_label, "@{%s_values}" % kd)
              if kd in ("start", "end")
              else kd
              for kd in element.kdims
          ]
          dims = kdims + element.vdims
      else:
          dims = []
      return dims, {}
  
imports: from collections import defaultdict
  import numpy
  import param
  from bokeh.models import Bezier, ColumnDataSource, EdgesAndLinkedNodes, NodesAndLinkedEdges, NodesOnly, Patches, StaticLayoutProvider
  from ...core.data import Dataset
  from ...core.options import Cycle, abbreviated_exception
  from ...core.util import dimension_sanitizer, unique_array
  from ...util.transform import dim
  from ..mixins import ChordMixin, GraphMixin
  from ..util import get_directed_graph_paths, process_cmap
  from .chart import ColorbarPlot, PointPlot
  from .element import CompositeElementPlot, LegendPlot
  from .styles import base_properties, fill_properties, line_properties, rgba_tuple, text_properties
label_desc: Use image node_id 2 for calling the GraphPlot obj's underlying member method code with example usage: obj._hover_opts(element) and returns: dims,  dict