VERTEX_EDGES_CLASS.get(conf); inputOutEdgesClass = (Class<? extends OutEdges<I, E>>) INPUT_VERTEX_EDGES_CLASS.getWithDefault(conf, outEdgesClass);
VERTEX_EDGES_CLASS.get(conf); inputOutEdgesClass = (Class<? extends OutEdges<I, E>>) INPUT_VERTEX_EDGES_CLASS.getWithDefault(conf, outEdgesClass);