<｜begin▁of▁sentence｜>### Instruction:
As a video game developer, you are tasked with designing and programming the gameplay mechanics for a new video game. You need to use the iGraph library in Python to set the size of the first 10 vertices of a graph, which has been read from a GML file, to 10. This is essential for creating a visually appealing and engaging game environment for the players.
### Response:
import igraph as ig

# Load a graph
file_path = 'path_to_graph.gml'
g = ig.read(file_path)

# Set the sizes of the vertices in the first 10 positions to a size of 10
vertex_indices = range(10)
g.vs[vertex_indices]['size'] = 10

# Verify the sizes have been updated
for idx in vertex_indices:
    print('Vertex', idx, 'size:', g.vs[idx]['size'])
<|EOT|>
