<｜begin▁of▁sentence｜>### Instruction:
As a chaplain providing spiritual support to a diverse community, you receive a request to analyze the collaborative networks within a group of astrophysicists involved in various research projects. Utilizing a file named "astro-ph.gml," you are tasked with employing the Louvain method for community detection to identify clusters representing potential collaborations. Furthermore, you are asked to calculate the modularity density score for the detected communities.
### Response:
import networkx as nx
from cdlib import algorithms, evaluation

# Load the graph
G = nx.read_gml('graphfiles/astro-ph.gml')

# Perform community detection using the Louvain method
communities = algorithms.louvain(G)

# Evaluate the modularity density of the identified communities
mod_density = evaluation.modularity_density(G, communities)

# Output the modularity density
print(mod_density.score)
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