code: def transform_bson(self, value):
      if value.subtype == USER_DEFINED_SUBTYPE:
          return _deserialize(value, from_bytes=True)
      return value
  
file_path: PySyft/packages/syft/src/syft/store/mongo_codecs.py
imports: from bson import CodecOptions
  from bson.binary import Binary
  from bson.binary import USER_DEFINED_SUBTYPE
  from bson.codec_options import TypeDecoder
  from bson.codec_options import TypeRegistry
  from ..serde.deserialize import _deserialize
  from ..serde.serialize import _serialize
label_desc: Use image node_id 1 for calling the SyftMongoBinaryDecoder obj's underlying member method code with example usage: obj.transform_bson(value) and returns: value, _deserialize