<｜begin▁of▁sentence｜>### Instruction:
As a Quality Control Inspector, you have been assigned to verify the quality of a batch of 10 network devices with various connections. Your task is to visually represent the network connections in a graph and ensure that each device's size is set to 20 and colored blue, while the edges are curved at 0.2. Using NetworkX's GraphArtist.set function, you should then plot and save the graph as a PDF file named 'network_visualization.pdf'.
### Response:
from igraph import * 

# Create a simple graph
g = Graph.Erdos_Renyi(n=10, m=20)

# Initialize a graph artist
artist = GraphArtist()

# Set multiple visual style parameters at once
style = {'vertex_size': 20, 'vertex_color': 'blue', 'edge_curved': 0.2}
artist.set(**style)

# Plot the graph with the updated visual style
artist.plot(g, 'graph_visualization.pdf')
<|EOT|>
