code: def fit(self, *args, **kwargs):
      self.masker = check_embedded_masker(self)
  
file_path: nilearn/nilearn/_utils/tests/test_masker_validation.py
imports: import nibabel
  import numpy
  import pytest
  from joblib import Memory
  from sklearn.base import BaseEstimator
  from nilearn._utils.masker_validation import check_embedded_masker
  from nilearn.experimental.surface import SurfaceMasker
  from nilearn.maskers import MultiNiftiMasker, NiftiMasker
label_desc: Use image node_id 2 for calling the DummyEstimator obj's underlying member method code with example usage: obj.fit() without return types