<｜begin▁of▁sentence｜>### Instruction:
Given a graph that you can read from graph_dag.gml, can you use the `is_dag` function in igraph to check whether the graph is a directed acyclic graph (DAG)?

Notes: You need to print whether the graph is a DAG or not.
### Response:
from igraph import Graph
import igraph as ig

g = ig.read('graph_dag.gml')

# Check if the graph is a directed acyclic graph (DAG)
is_dag = g.is_dag()

# Print the result
print('Is the graph a DAG:', is_dag)
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