<｜begin▁of▁sentence｜>### Instruction:
Given the Coauthorships in network science graph which can be loaded from a gml file named netscience.gml, how can you use the Louvain function in cdlib to detect community structure and save it to a CSV file?
### Response:
import networkx as nx
from cdlib import algorithms, readwrite

# Load a graph of coauthorships in network science
G = nx.read_gml('netscience.gml')

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

# Write the community structure to a CSV file
readwrite.write_community_csv(communities, 'communities.csv', delimiter=',')
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