code: def test_builder_eval(self):
      x_val = np.array([[-1, 2, -3], [4, -5, 6]], dtype=np.float32)
      alpha = 1.0
      beta = 2.0
      v = mb.sigmoid_hard(x=x_val, alpha=alpha, beta=beta)
      assert is_close(
          np.minimum(np.maximum((alpha * x_val) + beta, 0), 1), v.val
      )
  
imports: from scipy import special
  import scipy
  from coremltools.converters.mil import testing_reqs
  from coremltools.converters.mil.testing_reqs import *
  from .testing_utils import run_compare_builder
label_desc: Use image node_id 2 for calling the TestSigmoidHard obj's underlying member method code with example usage: obj.test_builder_eval() without return types