code: def basic_graph():
      l = np.linspace(0, 2 * np.pi, 20, endpoint=False)
      x = np.column_stack((np.cos(l), np.sin(l)))
      G = knn(x, 2)
      return G
  
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 2 for calling a global function with example usage: basic_graph() and returns: G