<｜begin▁of▁sentence｜>### Instruction:
Given the High-energy theory collaborations Graph which you can read from a gml file named hep-th.gml, can you use the Louvain algorithm in cdlib to perform community detection? And can you output the resulting communities into a JSON file?
### Response:
import networkx as nx
from cdlib import algorithms, readwrite

# Create a graph from the High-energy theory collaborations file
g = nx.read_gml('hep-th.gml')

# Detect communities using the Louvain algorithm
coms = algorithms.louvain(g)

# Write the identified community structure to a JSON file
readwrite.write_community_json(coms, 'communities.json')
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