<｜begin▁of▁sentence｜>### Instruction:
Using the RandomWalkSampler with a specified number of nodes, how can we sample a subgraph from an Erdos-Renyi graph with n=400 and p=0.25, and what is the significance of sampling nodes with a single random walk?
### Response:
import networkx as nx
from littleballoffur import RandomWalkSampler

G = nx.gnp_random_graph(n=400, p=0.25)

sampler = RandomWalkSampler(50, seed=10)

sampler_G = sampler.sample(G)

print(sampler_G.nodes())
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