<｜begin▁of▁sentence｜>### Instruction:
Given a tree with edges defined as pairs of node indices, for example, (0, 1), (0, 2), (1, 3), (1, 4), how can we use the igraph library to apply a circular Reingold-Tilford layout to visualize the tree structure?
### Response:
import igraph as ig
import json

# Assuming we have a tree graph
edges = [(0, 1), (0, 2), (1, 3), (1, 4)]

# Create an igraph Graph instance
G = ig.Graph(edges)

# Apply the circular Reingold-Tilford layout for trees
layout = G.layout_reingold_tilford_circular()

# Plot the graph with this layout
ig.plot(G, layout=layout, target='tree_layout.png')
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