code: def test_max_2():
      myfield = basic_field()
      myfield.field[555] = 28
      idx, depth = myfield.get_local_maxima()
      assert len(idx) == 2
      assert_array_equal(idx, np.array([555, 999]))
      assert_array_equal(depth, np.array([5, 3]))
  
imports: import numpy
  import numpy.random
  from numpy.testing import assert_array_equal
  from ..field import field_from_coo_matrix_and_data, field_from_graph_and_data
  from ..graph import wgraph_from_3d_grid
label_desc: Use image node_id 8 for calling a global function with example usage: test_max_2() without return types