code: def test_linspace_equivalence(self):
      y, st = np.linspace(2, 10, retstep=True)
      assert_almost_equal(st, 8 / 49.0)
      assert_array_almost_equal(y, mgrid[2:10:50j], 13)
  
imports: import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_array_almost_equal, assert_raises, assert_raises_regex
  from numpy.lib.index_tricks import mgrid, ogrid, ndenumerate, fill_diagonal, diag_indices, diag_indices_from, index_exp, ndindex, r_, s_, ix_
label_desc: Use image node_id 2 for calling the TestGrid obj's underlying member method code with example usage: obj.test_linspace_equivalence() without return types