'Test log_sum_exp'

def test_log_sum_exp(self):

    atom = log_sum_exp(vstack((- log(self.x)), self.y))
    self.assertEqual(atom.size, (1, 1))
    self.assertEqual(atom.curvature, s.CONVEX)
    expr = log_sum_exp(self.A, axis=0)
    self.assertEqual(expr.size, (1, 2))
