// =========================== Triangle Enumeration ============================
MapOperator toLowerDegreeEdge = MapOperator.builder(new ProjectToLowerDegreeVertex())
.input(countJoiner).name("Select lower-degree Edge").build();
MapOperator projectOutCounts = MapOperator.builder(new ProjectOutCounts())
.input(countJoiner).name("Project out Counts").build();
ReduceOperator buildTriads = ReduceOperator.builder(new BuildTriads(), IntValue.class, 0)
.input(toLowerDegreeEdge).name("Build Triads").build();