<｜begin▁of▁sentence｜>### Instruction:
Given the Les Miserables Graph which you can read from a GML file named lesmis.gml, can you use the modularity maximization function 'mod_m' in cdlib to perform community detection starting from a given source vertex (e.g., node with id '1')? And can you produce a JSON representation of the detected communities?
### Response:
import networkx as nx
from cdlib import algorithms

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

# Apply the Modularity Maximization community detection algorithm starting from node 1
coms = algorithms.mod_m(G, '1')

# Convert the community structure to JSON
json_coms = coms.to_json()

print(json_coms)
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