<｜begin▁of▁sentence｜>### Instruction:
As a video game tester working on a new game release, you want to ensure that the game's network representation is accurate before the launch. You have a directed graph representing the game world, with the following connections: (0, 1), (1, 2), (2, 3). Using the networkx library, you need to set the arrow widths of all edges to a specific value, such as 2.0, and save the graph plot as 'graph_with_arrow_widths.png'.
### Response:
import igraph as ig

# Load a graph
g = ig.Graph([(0, 1), (1, 2), (2, 3)])

# Define a layout for the graph
layout = g.layout('kk')

# Create a plot object
plot = ig.Plot()

# Add the graph to the plot with a specific layout
plot.add(g, layout=layout)

# Set the arrow widths
plot.redraw()
for edge in plot.objects[0].edge_collections[0]:
    edge.set_arrow_width(2.0)

# Save the plot to a file
plot.save('graph_with_arrow_widths.png')
<|EOT|>
