code: def canica_data():
      """Create a canonical ICA data for testing purposes."""
      return _make_canica_test_data()[0]
  
imports: import numpy
  import pytest
  from nibabel import Nifti1Image
  from nilearn._utils.testing import write_imgs_to_path
  from nilearn.conftest import _affine_eye
  from nilearn.decomposition.dict_learning import DictLearning
  from nilearn.decomposition.tests.test_canica import _make_canica_test_data
  from nilearn.image import get_data, iter_img
  from nilearn.maskers import NiftiMasker
label_desc: Use image node_id 2 for calling a global function with example usage: canica_data() and returns: _make_canica_test_data