          target_offset: :class:`numpy.ndarray`
              The (x, y) offset for the mask at the requested target centering
           centering: str
              The centering to set the sub crop area for. One of `"legacy"`, `"face"`. `"head"`
          """
          if centering == self.stored_centering and coverage_ratio == 1.0:
              return
  
 
</s> remove         offset: :class:`numpy.ndarray`
            The (x, y) offset from the center point to return the mask for
        centering: str
 </s> add         source_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at its stored centering
        target_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at the requested target centering
         centering: str </s> remove         if centering == self.stored_centering:
 </s> add         if centering == self.stored_centering and coverage_ratio == 1.0: </s> remove         sub_crop_offset: :class:`numpy.ndarray`
            The (x, y) offset to crop the mask from the center point. Set to `None` if the mask
            does not need to be offset for alternative centering
 </s> add         source_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at its stored centering
        target_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at the requested target centering </s> remove         sub_crop_offset: :class:`numpy.ndarray`
            The (x, y) offset to crop the mask from the center point. Set to `None` if the mask
            does not need to be offset for alternative centering
 </s> add         source_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at its stored centering
        target_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at the requested target centering </s> remove         sub_crop_offset: :class:`numpy.ndarray`, optional
            The (x, y) offset to crop the mask from the center point.
 </s> add         source_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at its stored centering
        target_offset: :class:`numpy.ndarray`
            The (x, y) offset for the mask at the requested target centering
        coverage_ratio: float, optional
            The coverage ratio to be applied to the target image. ``None`` for default (1.0).
            Default: ``None``
          target_offset: :class:`numpy.ndarray`
              The (x, y) offset for the mask at the requested target centering
           centering: str
              The centering to set the sub crop area for. One of `"legacy"`, `"face"`. `"head"`
        coverage_ratio: float, optional
            The coverage ratio to be applied to the target image. ``None`` for default (1.0).
            Default: ``None``
          """
          if centering == self.stored_centering and coverage_ratio == 1.0:
              return
  
keep keep keep add keep keep keep keep
 lib.detected_face.Mask
  - Add source + target offset and coverage to set_sub_crop method 
lib/align/detected_face.py