code: def test_bicgstab_on_random_system(
      self, shape, dtype, preconditioner
  ):
      rng = jtu.rand_default(self.rng())
      A = rng(shape, dtype)
      solution = rng(shape[1:], dtype)
      M = self._fetch_preconditioner(preconditioner, A, rng=rng)
      b = matmul_high_precision(A, solution)
      tol = shape[0] * float(jnp.finfo(A.dtype).eps)
      x, info = jax.scipy.sparse.linalg.bicgstab(
          A, b, tol=tol, atol=tol, M=M
      )
      using_x64 = solution.dtype.kind in {np.float64, np.complex128}
      solution_tol = 1e-8 if using_x64 else 1e-4
      self.assertAllClose(
          x, solution, atol=solution_tol, rtol=solution_tol
      )
  
imports: from functools import partial
  import unittest
  from absl.testing import absltest
  import numpy
  import scipy.sparse.linalg
  import jax
  import jax.numpy
  import jax.scipy.sparse.linalg
  from jax import jit
  from jax import lax
  from jax.tree_util import register_pytree_node_class
  import jax._src.scipy.sparse.linalg
  from jax._src import config
  from jax._src import dtypes
  from jax._src import test_util
label_desc: Use image node_id 12 for calling the LaxBackedScipyTests obj's underlying member method code with example usage: obj.test_bicgstab_on_random_system(shape, dtype, preconditioner) without return types