Partitioning in 2 when nparts is only 2

[dj-park]

2 1 011
1 2 1 
2 1 1 

Graph file looks like above.
There are only two nodes, one with weight of 1 and another with weight of 2.
If I do
gpmetis -ptype=rb test_graphfile 2
the result is

1
1

I thought it's intuitive to return 0,1 when there are only two nodes and I am trying to partition them into two.
Is this expected?