code: def test_generic_weighted_projected_graph_custom(self):
      def jaccard(G, u, v):
          unbrs = set(G[u])
          vnbrs = set(G[v])
          return len(unbrs & vnbrs) / len(unbrs | vnbrs)
  
      def my_weight(G, u, v, weight="weight"):
          w = 0
          for nbr in set(G[u]) & set(G[v]):
              w += G.edges[u, nbr].get(weight, 1) + G.edges[v, nbr].get(
                  weight, 1
              )
          return w
  
      B = nx.bipartite.complete_bipartite_graph(2, 2)
      for i, (u, v) in enumerate(B.edges()):
          B.edges[u, v]["weight"] = i + 1
      G = bipartite.generic_weighted_projected_graph(
          B, [0, 1], weight_function=jaccard
      )
      assert edges_equal(
          list(G.edges(data=True)), [(0, 1, {"weight": 1.0})]
      )
      G = bipartite.generic_weighted_projected_graph(
          B, [0, 1], weight_function=my_weight
      )
      assert edges_equal(
          list(G.edges(data=True)), [(0, 1, {"weight": 10})]
      )
      G = bipartite.generic_weighted_projected_graph(B, [0, 1])
      assert edges_equal(
          list(G.edges(data=True)), [(0, 1, {"weight": 2})]
      )
  
imports: import pytest
  import networkx
  from networkx.algorithms import bipartite
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 8 for calling the TestBipartiteWeightedProjection obj's underlying member method code with example usage: obj.test_generic_weighted_projected_graph_custom() and returns: unknown, w