Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/16464
I print out the values of each step of `seqOp`,
`graph.vertices.aggregate(0.0)(seqOp, _ + _)` just returns the `seqOp` of the
last vertex.
VertexID sequence for original model:
-8 -6 -3 10 -5 4 11 -1 0 1 -2 6 -7 7 8 -10 -9 9 -4 3 -11 5 2
For this sequence, it returns the value of Vertex2.
VertexID sequence for the loaded model:
3 5 2 -11 -5 4 11 -1 0 1 -2 6 -7 -8 7 -10 8 9 -9 -4 10 -6 -3
For this sequence, it returns the value of Vertex -3.
Actually, the value of Vertex2 is the same in both sequences (same of
Vertex -3 too).
It seems that `graph.vertices.aggregate(0.0)(seqOp, _ + _)` doesn't
returns the aggregated value as it is supposed to return (i.e.,
`sum(SeqOp(Vertex_i))` ).
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