<｜begin▁of▁sentence｜>### Instruction:
As a network analysis specialist, you have been tasked with using the Astrophysics collaborations graph, which has been imported from a GML file named astro-ph.gml. Your goal is to employ the regularized spectral clustering community detection algorithm available in the cdlib library. You are asked to specify a particular percentile for degree distribution regularization and then provide the resulting NodeClustering object in JSON format.
### Response:
import networkx as nx
from cdlib import algorithms

# Read the astrophysics collaborations graph
G = nx.read_gml('astro-ph.gml')

# Apply the regularized spectral clustering community detection algorithm
# with a specific percentile for degree distribution regularization
communities = algorithms.r_spectral_clustering(G, n_clusters=3, method='regularized', percentile=20)

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

print(clusters_json)
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