<｜begin▁of▁sentence｜>### Instruction:
Given a graph that can be loaded from 'graph_data.gml', how would you find out the convergence field size of the graph using igraph's 'convergence_field_size' function?
### Response:
from igraph import Graph

# Load the graph
graph = Graph.Read_GML('graph_data.gml')

# Get the convergence field size of the graph
convergence_field_size = graph.convergence_field_size()

print('Convergence field size:', convergence_field_size)
<|EOT|>
