Holoviews弦图和holomaps节点颜色变为b时出现问题

Question

我试图创建一个和弦图，它会根据滑块小部件的移动而改变。我创建了和弦的dict并把它放到全息图中。但是，当我这样做时，弦的外周长变成黑色而不是节点颜色。然而，dict中的每个和弦都正确地显示出来。我做错什么了吗？我尝试使用默认的机场路线数据集重新创建我看到的问题

import holoviews as hv
from holoviews import opts, dim
from bokeh.sampledata.airport_routes import routes, airports

hv.extension('bokeh')

# Count the routes between Airports
route_counts = routes.groupby(['SourceID', 'DestinationID']).Stops.count().reset_index()
nodes = hv.Dataset(airports, 'AirportID', 'City')
chord = hv.Chord((route_counts, nodes), ['SourceID', 'DestinationID'], ['Stops'])

# Select the 20 busiest airports
busiest = list(routes.groupby('SourceID').count().sort_values('Stops').iloc[-20:].index.values)
busiest_airports = chord.select(AirportID=busiest, selection_mode='nodes')

busiest_airports.opts(
    opts.Chord(cmap='Category20', edge_color=dim('SourceID').str(), 
               height=800, labels='City', node_color=dim('AirportID').str(), width=800))

route_dict = {1:busiest_airports, 2:busiest_airports}

hmap = hv.HoloMap(route_dict, kdims=['test'])
hmap

每个和弦应该看起来像route_dict[1]的输出