code: def _clean_matrix_name(name):
      return re.sub("[^0-9a-zA-Z]+", "_", name)
  
imports: import functools
  import re
  import os
  import unittest
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import scipy.linalg
  import scipy.sparse
  import jax
  from jax import config
  from jax._src import test_util
  from jax.experimental.sparse import linalg, bcoo
  import jax.numpy
label_desc: Use image node_id 1 for calling a global function with example usage: _clean_matrix_name(name) and returns: re