code: def __init__(self, mask_img_):
      self.mask_img_ = mask_img_
  
imports: import warnings
  from copy import copy
  from functools import partial
  from joblib import Memory
  from nilearn import _utils, image, masking
  from nilearn.maskers._utils import compute_middle_image
  from nilearn.maskers.base_masker import BaseMasker, _filter_and_extract
label_desc: Use image node_id 1 to create a new _ExtractionFunctor object  with example: obj = _ExtractionFunctor(mask_img_)