<｜begin▁of▁sentence｜>### Instruction:
Given the Adjacency Noun Graph stored in a GML file named adjnoun.gml, can we compare the community structures detected using the Louvain and Walktrap algorithms by plotting a similarity matrix using the Adjusted Mutual Information scoring function?
### Response:
import networkx as nx
from cdlib import algorithms, viz, evaluation

# Create a graph from a GML file
G = nx.read_gml('adjnoun.gml')

# Perform community detection using two different algorithms
communities_louvain = algorithms.louvain(G)
communities_walktrap = algorithms.walktrap(G)

# Plot a similarity matrix between the detected communities
# using the Adjusted Mutual Information scoring function
similarity_matrix = viz.plot_sim_matrix([communities_louvain, communities_walktrap],
                                        scoring=evaluation.adjusted_mutual_information)

similarity_matrix.savefig('similarity_matrix.png')  # Save the matrix to a file
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