<｜begin▁of▁sentence｜>### Instruction:
As a network analyst specializing in collaborative research networks, you are tasked with examining the connections among astrophysics researchers. You have access to a dataset in a GML file named astro-ph.gml, which contains information about collaborations in the astrophysics field. Your goal is to use the Leiden algorithm available in the Community Detection Library (cdlib) to identify distinct communities within the network. Once you have applied the Leiden algorithm, you need to generate a JSON representation that clearly outlines the detected node clusters in the astrophysics collaborations graph.
### Response:
import networkx as nx
from cdlib import algorithms

# Create a graph from an astrophysics collaborations dataset
G = nx.read_gml('astro-ph.gml')

# Perform community detection using the Leiden algorithm
communities = algorithms.leiden(G)

# Convert the NodeClustering object to a JSON representation
clusters_json = communities.to_json()

# Print the JSON of detected communities
print(clusters_json)
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