question: get dataset with bottom vertices . concode_field_sep Tuple2<EV,EV> edgeValues concode_elem_sep ExecutionEnvironment context concode_elem_sep DataSet<BipartiteEdge<KT,KB,EV>> edges concode_elem_sep Projection<KT,VVT,VVB,EV> projection concode_elem_sep Edge<KB,Tuple2<EV,EV>> edge concode_elem_sep DataSet<Vertex<KB,VVB>> bottomVertices concode_elem_sep DataSet<Vertex<KT,VVT>> topVertices concode_elem_sep Edge<KB,Projection<KT,VVT,VVB,EV>> edge concode_field_sep BipartiteGraph<KT,KB,VVT,VVB,EV> fromDataSet concode_elem_sep Graph<KB,VVB,Tuple2<EV,EV>> projectionBottomSimple concode_elem_sep Graph<KT,VVT,Projection<KB,VVB,VVT,EV>> projectionTopFull concode_elem_sep DataSet<Tuple5<KT,KB,EV,VVT,VVB>> joinEdgeWithVertices concode_elem_sep DataSet<BipartiteEdge<KT,KB,EV>> getEdges concode_elem_sep void join concode_elem_sep void join concode_elem_sep void join concode_elem_sep void join concode_elem_sep Graph<KB,VVB,Projection<KT,VVT,VVB,EV>> projectionBottomFull concode_elem_sep DataSet<Vertex<KT,VVT>> getTopVertices concode_elem_sep Graph<KT,VVT,Tuple2<EV,EV>> projectionTopSimple
target: DataSet < Vertex < KB , VVB >> function ( ) { return bottomVertices ; }