<｜begin▁of▁sentence｜>### Instruction:
Given the graph of Books about US politics which you can read from a GML file named polbooks.gml, can you use the significance_communities function in cdlib to perform community detection? And can you convert the resulting NodeClustering object to JSON format? Notes: You need to print the JSON representation of the NodeClustering object.
### Response:
import networkx as nx
from cdlib import algorithms

# Read the graph from the GML file
G = nx.read_gml('polbooks.gml')

# Perform significance community detection
communities = algorithms.significance_communities(G)

# Convert to JSON
communities_json = communities.to_json()
print(communities_json)
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