make graph visualization become colorful

examples/graph_visual.py

@@ -1,5 +1,6 @@
 import networkx as nx
 from pyvis.network import Network
+import random
 
 # Load the GraphML file
 G = nx.read_graphml('./dickens/graph_chunk_entity_relation.graphml')
@@ -10,5 +11,9 @@ net = Network(notebook=True)
 # Convert NetworkX graph to Pyvis network
 net.from_nx(G)
 
+# Add colors to nodes
+for node in net.nodes:
+    node['color'] = "#{:06x}".format(random.randint(0, 0xFFFFFF))
+
 # Save and display the network
 net.show('knowledge_graph.html')