code: def test_builder_tanh_eval(self):
      x_val = np.array([[-1, 2, -3], [4, -5, 6]], dtype=np.float32)
      v = mb.tanh(x=x_val)
      assert is_close(np.tanh(x_val), v.val)
  
imports: 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 25 for calling the TestElementwiseUnary obj's underlying member method code with example usage: obj.test_builder_tanh_eval() without return types