<｜begin▁of▁sentence｜>### Instruction:
How can you generate a directed graph with 100 vertices using the forest fire model, with a forward burning probability of 0.3, a backward burning probability factor of 0.9, and 1 ambassador in each step using igraph's GraphBase.Forest_Fire method?
### Response:
from igraph import GraphBase

# Generate a graph based on the forest fire model
n = 100  # number of vertices in the graph
fw_prob = 0.3  # forward burning probability
bw_factor = 0.9  # ratio of backward and forward burning probability
ambs = 1  # number of ambassadors chosen in each step
directed = True  # whether the graph will be directed

# Creating the forest fire graph
forest_fire_graph = GraphBase.Forest_Fire(n, fw_prob, bw_factor, ambs, directed)

# Print the summary of the graph
print(forest_fire_graph.summary())
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