GraphX runs without Spark?

[Deep Pradhan]

I have a single node cluster on which I have Spark running. I ran some
graphx codes on some data set. Now when I stop all the workers in the
cluster (sbin/stop-all.sh), the codes still run and gives the answers. Why
is it so? I mean does graphx run even without Spark coming up?
Same thing even while running the example codes using bin/run-examples
Thank You