          Returns
          -------
          dict
              The "a", "b" keys for each side, containing a sub-dictionary with the
              filename as key and :class:`lib.faces.detected_face.AlignedFace` object as value.
          """
          retval = dict()
          for side, detected_faces in self._detected_faces.items():
              ret_side = dict()
              size = get_centered_size("legacy" if self._alignments_version[side] == 1.0 else "head",
 
</s> remove             ret_side = dict()
 </s> add             retval[side] = dict() </s> remove                                      input_sizes[side])
            for fhash, face in detected_faces.items():
                face.aligned = AlignedFace(face.landmarks_xy,
                                           centering=self._config["centering"],
                                           size=size,
                                           is_aligned=True)
                for filename in self._hash_to_filenames(side, fhash):
                    ret_side[filename] = face.aligned
            retval[side] = ret_side
 </s> add                                      self._image_sizes[side])
            for filename, face in detected_faces.items():
                retval[side][filename] = AlignedFace(face.landmarks_xy,
                                                     centering=self._config["centering"],
                                                     size=size,
                                                     is_aligned=True)
        logger.debug("Loaded aligned faces: %s", {k: len(v) for k, v in retval.items()}) </s> remove     @property
    def aligned_faces(self):
        """ dict: The "a", "b" keys for each side, containing a sub-dictionary with the
        filename as key and :class:`lib.faces.detected_face.aligned` object as value. """
        return self._aligned_faces

 </s> add  </s> remove         self._load_alignments()
        self._check_all_faces()

        self._aligned_faces = self._get_aligned_faces(sizes)
 </s> add         self._validity_check()
        self._aligned_faces = self._get_aligned_faces()
            filename as key and :class:`lib.align.AlignedFace` object as value.
          Returns
          -------
          dict
              The "a", "b" keys for each side, containing a sub-dictionary with the
            filename as key and :class:`lib.align.AlignedFace` object as value.
          """
          retval = dict()
          for side, detected_faces in self._detected_faces.items():
              ret_side = dict()
              size = get_centered_size("legacy" if self._alignments_version[side] == 1.0 else "head",
keep keep keep keep replace keep keep keep keep keep
 Update extracted faces to use PNG EXIF data (#1123)

Documentation
  - Update Usage.md, align.rst and image.rst
lib.image.py
  - read_image - Remove hash return, add metadata return
  - Remove read_image_hash functions
  - Add read_image_meta functios
  - Replace encode_image_with_hash with encode_image (to store metadata)
  - Add png meta reading and writing functions
  - Update Image Loaders/Savers to handle metadata rather than hashes
lib.training_data
  - Naming updates to remove references to hashes
lib.align.Alignments
  - Add versioning notes
  - Increment alignments version to 2.1
  - Deprecate hashing lookup functions
  - Replace filter_hashes with filter_faces
lib.align.detected_face
  - DetectedFace
    - Remove hash property
    - Add png header data serializing/deserializing functions
  - Mask
    - Add png header data serializing/deserializing functions
  - add update_legacy_png_header function to update png meta data
lib.cli.args - Deprecate alignments files for training
- plugins.train.trainer
  - Update alignments/mask code to read png header data
- scripts.convert
  - Aligned images folder - read data from png headers
- scripts.extract
  - Write png header information and no longer store hash of face
- tools.alignments
  - remove leftover-faces, merge and update-hashes jobs
  - Update jobs to use png meta data rather than hashes
- tools.manual
  - Update extract code to output png meta data and don't store hashes
  - Perform check on launch that tool is not pointing at a faces folder
tools.mask
  - Update to use png meta data
tools.sort
  - Update to use png meta data 
plugins/train/trainer/_base.py