fix circular dependencies

fdlite/__init__.py

@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+from .errors import ArgumentError, CoordinateRangeError           # noqa:F401
+from .errors import InvalidEnumError, MissingExifDataError        # noqa:F401
+from .errors import ModelDataError                                # noqa:F401
 from .face_detection import FaceDetection, FaceDetectionModel     # noqa:F401
 from .face_detection import FaceIndex                             # noqa:F401
 from .face_landmark import FaceLandmark, face_detection_to_roi    # noqa:F401
@@ -10,24 +13,4 @@
 from .iris_landmark import iris_roi_from_face_landmarks           # noqa:F401
 
 
-class InvalidEnumError(Exception):
-    """Raised when a function was called with an invalid Enum value"""
-
-
-class ModelDataError(Exception):
-    """Raised when a model returns data that is incompatible"""
-
-
-class CoordinateRangeError(Exception):
-    """Raised when coordinates are expected to be in a different range"""
-
-
-class ArgumentError(Exception):
-    """Raised when an argument is of the wrong type or malformed"""
-
-
-class MissingExifDataError(Exception):
-    """Raised if required EXIF data is missing from an image"""
-
-
 __version__ = '0.4.0'