code: def test_array_conversion(X, arr_desired):
      """Test the array conversion static method."""
      arr_actual = MultivariateTransformer._convert_to_array(X)
      np.testing.assert_allclose(
          arr_actual, arr_desired, atol=1e-5, rtol=0.0
      )
  
file_path: pyts/pyts/multivariate/transformation/tests/test_multivariate.py
imports: import numpy
  import pytest
  import re
  from scipy.sparse import csr_matrix
  from pyts.classification import SAXVSM
  from pyts.image import RecurrencePlot
  from pyts.multivariate.transformation import MultivariateTransformer
  from pyts.transformation import BOSS
label_desc: Use image node_id 2 for calling a global function with example usage: test_array_conversion(X, arr_desired) without return types