code: def __init__(
      self, _resampled_maps_img_, _resampled_mask_img_, keep_masked_maps
  ):
      self._resampled_maps_img_ = _resampled_maps_img_
      self._resampled_mask_img_ = _resampled_mask_img_
      self.keep_masked_maps = keep_masked_maps
  
file_path: nilearn/nilearn/maskers/nifti_maps_masker.py
imports: import warnings
  import numpy
  from joblib import Memory
  from nilearn import _utils, image
  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(_resampled_maps_img_, _resampled_mask_img_, keep_masked_maps)