.input(edgeCounter).name("Join Counts").build();
// =========================== 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();