code: def testSparsify(self):
      M_dense = jnp.arange(24).reshape(4, 6)
      M_sparse = BCOO.fromdense(M_dense)
      v = jnp.arange(M_dense.shape[0])
  
      @self.sparsify
      def func(x, v):
          return -jnp.sin(jnp.pi * x).T @ (v + 1)
  
      with jtu.ignore_warning(
          category=CuSparseEfficiencyWarning,
          message="bcoo_dot_general GPU lowering requires matrices with sorted indices*",
      ):
          result_sparse = func(M_sparse, v)
      result_dense = func(M_dense, v)
      self.assertAllClose(result_sparse, result_dense)
  
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 8 for calling the SparsifyTest obj's underlying member method code with example usage: obj.testSparsify() and returns: unknown