code: def test_builder_eval(self):
      x_val = np.array([[-1, 2, -3], [4, -5, 6]], dtype=np.float32)
      v = mb.linear_activation(x=x_val, alpha=2.0, beta=3.0)
      assert is_close(x_val * 2.0 + 3.0, 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 TestLinearActivation obj's underlying member method code with example usage: obj.test_builder_eval() without return types