def setUp(self): ics = np.random.laplace(size=(3, 1024)) np.random.seed(1) mixing_matrix = np.random.random((100, 3)) s = Image(np.dot(mixing_matrix, ics).reshape((100, 32, 32))) for (axis, name) in zip(s.axes_manager._axes, ("z", "y", "x")): axis.name = name s.decomposition() self.s = s