code: def _setup(self, dtype):
      dtype = numpy.dtype(dtype)
      a_shape = (self.n, self.n)
      a = testing.shaped_random(
          a_shape, numpy, dtype=dtype, scale=2 / self.n
      )
      a_mask = testing.shaped_random(a_shape, numpy, dtype="f", scale=1)
      a[a_mask > self.density] = 0
      a_diag = numpy.diag(numpy.ones((self.n,), dtype=dtype))
      a = a + a_diag
      b = testing.shaped_random((self.n,), numpy, dtype=dtype)
      test_tol = self._test_tol[dtype.char.lower()]
      return a, b, test_tol
  
imports: import numpy
  import pytest
  import cupy
  from cupyx import cusolver
  from cupy import testing
  from cupy._core import _routines_linalg
  import cupyx
label_desc: Use image node_id 2 for calling the TestCsrlsvqr obj's underlying member method code with example usage: obj._setup(dtype) and returns: a,  b,  test_tol