code: def test_grid_3d_5():
      nx, ny, nz = 5, 5, 5
      xyz = np.reshape(np.indices((nx, ny, nz)), (3, nx * ny * nz)).T
      G = wgraph_from_3d_grid(xyz, 26)
      D = G.weights.copy()
      G.set_euclidian(xyz)
      assert_array_almost_equal(G.weights, D)
  
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 16 for calling a global function with example usage: test_grid_3d_5() without return types