code: def edge_glyph(self):
      if self.filled:
          return "patches_1"
      elif self.bezier:
          return "bezier_1"
      else:
          return "multi_line_1"
  
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 1 for calling the GraphPlot obj's underlying member method code with example usage: obj.edge_glyph() and returns: str, str, str