<｜begin▁of▁sentence｜>### Instruction:
As a network analyst specializing in community detection, I often work with complex graphs to identify distinct groupings of nodes. Suppose you receive a dataset stored in the network.gml file format containing information on connections between nodes. In this case, you can utilize the community_fastgreedy function within igraph to analyze the network's community structure. Additionally, it's possible to compute the modularity score of the resulting community structure, shedding light on the strength of the identified communities.
### Response:
import igraph as ig

# Read a graph from a file
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