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)
      np.testing.assert_allclose(
          np.tanh(x_val), v.val, atol=1e-04, rtol=1e-05
      )
  
imports: import itertools
  import numpy
  import pytest
  import scipy
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import Function, get_new_symbol, types
  from coremltools.converters.mil.mil.ops.tests.iOS14 import backends
  from coremltools.converters.mil.mil.ops.tests.testing_utils import run_compare_builder
  from coremltools.converters.mil.mil.types.symbolic import is_compatible_symbolic_vector
  from coremltools.converters.mil.testing_reqs import compute_units
  from coremltools.converters.mil.testing_utils import ssa_fn
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