<｜begin▁of▁sentence｜>### Instruction:
As a Sustainability Consultant, you have been tasked with visualizing a sustainability network using Python's networkx library and the data stored in graph_data.gml. To create an insightful visualization, you need to utilize the Reingold-Tilford tree layout to represent the network as a tree structure, incorporating vertex labels to clearly indicate the different elements of the network. This visualization will help stakeholders comprehend the interconnections and relationships within the sustainability network more effectively.
### Response:
from igraph import Graph
import igraph as ig

# Load the graph
filename = 'graph_data.gml'
g = ig.read(filename)

# Get the Reingold-Tilford tree layout
layout = g.layout('rt')

# Plot the graph using the layout
ig.plot(g, layout=layout, vertex_label=g.vs['label'])
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