code: def test_rsqrt(self, dtype):
      # Adding 1.0 to avoid division by zero.
      a = testing.shaped_arange((2, 3), numpy, dtype) + 1.0
      out = cupyx.rsqrt(cupy.array(a))
      # numpy.sqrt is broken in numpy<1.11.2
      testing.assert_allclose(out, 1.0 / numpy.sqrt(a))
  
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
  import cupyx
label_desc: Use image node_id 1 for calling the TestRsqrt obj's underlying member method code with example usage: obj.test_rsqrt(dtype) without return types