Specifying the Seed value guarantees that the result is repeatable on the same cluster. However, the result can differ between clusters, as the sample graph is not deterministic.
SELECT * FROM randomwalksample (
ON citvertices AS "vertices" PARTITION BY id
ON citedges AS "edges" PARTITION BY from_id
TargetKey ('to_id')
FlyBackRate (0.15)
SampleRate (0.15)
Seed (1000)
OutputTables ('rw_vertices_15', 'rw_edges_15')
);