<｜begin▁of▁sentence｜>### Instruction:
Given a bipartite graph represented as an edge list [(1, 4), (1, 5), (2, 4), (2, 5), (3, 6)] with nodes {1, 2, 3} belonging to one bipartite set, how can we calculate the betweenness centrality for nodes in that specific set?
### Response:
import networkx as nx
from networkx.algorithms import bipartite

# Create a bipartite graph
B = nx.Graph()
# Add edges - each tuple represents an edge between the two nodes
B.add_edges_from([(1, 4), (1, 5), (2, 4), (2, 5), (3, 6)])
# Define the top nodes - the one bipartite node set
top_nodes = {1, 2, 3}
# Calculate betweenness centrality only for the top nodes
betweenness = bipartite.betweenness_centrality(B, nodes=top_nodes)
print(betweenness)
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