add missing imports to init.py

Author: Drew Kaul

nucleus/__init__.py

@@ -71,6 +71,7 @@
     BoxAnnotation,
     CuboidAnnotation,
     Point,
+    Point3D,
     PolygonAnnotation,
     Segment,
     SegmentationAnnotation,
@@ -110,7 +111,7 @@
     UPDATE_KEY,
 )
 from .dataset import Dataset
-from .dataset_item import DatasetItem, CameraParams
+from .dataset_item import DatasetItem, CameraParams, Quaternion
 from .errors import (
     DatasetItemRetrievalError,
     ModelCreationError,
@@ -136,7 +137,7 @@
 )
 from .slice import Slice
 from .upload_response import UploadResponse
-from .scene import Frame, Scene, LidarScene
+from .scene import Frame, LidarScene
 
 # pylint: disable=E1101
 # TODO: refactor to reduce this file to under 1000 lines.