<｜begin▁of▁sentence｜>### Instruction:
Given a graph which you can read from some_graph.gml, and assuming the graph has a VertexCollection with the name 'vc', how do you use the get_size function in igraph to get the sizes of all vertices in the collection 'vc'?
### Response:
import igraph as ig

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

# Assume the graph has a VertexCollection named 'vc'
# which you wish to get sizes for:
vertex_sizes = g.vs['vc'].get_size()

# Print the sizes of the vertices
print(vertex_sizes)
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