code: def testSparseWhileLoop(self):
      def cond_fun(params):
          i, A = params
          return i < 5
  
      def body_fun(params):
          i, A = params
          return i + 1, 2 * A
  
      def f(A):
          return lax.while_loop(cond_fun, body_fun, (0, A))
  
      A = jnp.arange(4)
      out_dense = f(A)
  
      Asp = BCOO.fromdense(A)
      out_sparse = self.sparsify(f)(Asp)
  
      self.assertEqual(len(out_dense), 2)
      self.assertEqual(len(out_sparse), 2)
      self.assertArraysEqual(out_dense[0], out_dense[0])
      self.assertArraysEqual(out_dense[1], out_sparse[1].todense())
  
imports: from functools import partial
  import math
  import operator
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  from jax import config, jit, lax
  import jax.numpy
  import jax._src.test_util
  from jax.experimental.sparse import BCOO, BCSR, sparsify, todense, SparseTracer
  from jax.experimental.sparse.transform import arrays_to_spvalues, spvalues_to_arrays, sparsify_raw, SparsifyValue, SparsifyEnv
  from jax.experimental.sparse.util import CuSparseEfficiencyWarning
  from jax.experimental.sparse import test_util
label_desc: Use image node_id 23 for calling the SparsifyTest obj's underlying member method code with example usage: obj.testSparseWhileLoop() and returns: unknown, unknown,  unknown, lax