<｜begin▁of▁sentence｜>### Instruction:
Given a graph which you can read from graph_file.gml, can you use the laplacian function in igraph to calculate the Laplacian matrix of the graph?
### Response:
import igraph as ig

# Load a graph from a file
g = ig.read('graph_file.gml')

# Compute the Laplacian matrix
laplacian_matrix = g.laplacian()

# Print the Laplacian matrix
print('Laplacian matrix:')
print(laplacian_matrix)
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