code: def test_value(self):
      X = np.linspace(0, 1, 10)[:, None]
      with pm.Model() as model:
          linear_mean = pm.gp.mean.Linear(2, 0.5)
      M = linear_mean(X).eval()
      npt.assert_allclose(M[1], 0.7222, atol=1e-3)
      assert M.shape == (10,)
  
file_path: pymc/tests/gp/test_mean.py
imports: import numpy
  import numpy.testing
  import pymc
label_desc: Use image node_id 1 for calling the TestLinearMean obj's underlying member method code with example usage: obj.test_value() without return types