code: def test_builder_rsqrt_eval(self):
      val = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.float32)
      v = mb.rsqrt(x=val)
      expected_outputs = np.array(
          [[1.0, 0.70710678, 0.57735027], [0.5, 0.4472136, 0.40824829]],
          dtype=np.float32,
      )
  
      np.testing.assert_allclose(
          expected_outputs, 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 19 for calling the TestElementwiseUnary obj's underlying member method code with example usage: obj.test_builder_rsqrt_eval() without return types