code: def test_symmeterize():
      a = np.array([0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6])
      b = np.array([1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 0, 0, 1])
      edges = np.vstack((a, b)).T
      d = np.ones(14)
      G = WeightedGraph(7, edges, d)
      G.symmeterize()
      d = G.weights
      assert (d == 0.5).all()
  
imports: import numpy
  import numpy.random
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_array_equal
  from ..graph import WeightedGraph, complete_graph, concatenate_graphs, eps_nn, knn, mst, wgraph_from_3d_grid, wgraph_from_adjacency, wgraph_from_coo_matrix
label_desc: Use image node_id 34 for calling a global function with example usage: test_symmeterize() without return types