fix import error

docs/conf.py

@@ -42,13 +42,25 @@ extensions = [
 ]
 
 autodoc_mock_imports = [
-    'cv2', 'matplotlib', 'nuscenes', 'PIL', 'pycocotools', 'pyquaternion',
-    'terminaltables', 'mmcv', 'mmdet', 'mmdet3d.version',
-    'mmdet3d.ops.ball_query', 'mmdet3d.ops.furthest_point_sample',
-    'mmdet3d.ops.gather_points', 'mmdet3d.ops.group_points',
-    'mmdet3d.ops.interpolate', 'mmdet3d.ops.roiaware_pool3d',
-    'mmdet3d.ops.spconv', 'mmdet3d.ops.voxel.voxel_layer', 'mmdet3d.ops.iou3d',
-    'mmdet3d.ops.utils'
+    'cv2',
+    'matplotlib',
+    'nuscenes',
+    'PIL',
+    'pycocotools',
+    'pyquaternion',
+    'terminaltables',
+    'mmcv',
+    'mmdet',
+    'mmdet3d.version',
+    'mmdet3d.ops.ball_query',
+    'mmdet3d.ops.furthest_point_sample',
+    'mmdet3d.ops.gather_points',
+    'mmdet3d.ops.group_points',
+    'mmdet3d.ops.interpolate',
+    'mmdet3d.ops.roiaware_pool3d',
+    'mmdet3d.ops.spconv',
+    'mmdet3d.ops.voxel.voxel_layer',
+    'mmdet3d.ops.iou3d',
 ]
 autosectionlabel_prefix_document = True
 

mmdet3d/ops/__init__.py

-from mmcv.ops import (RoIAlign, SigmoidFocalLoss, nms, roi_align,
+from mmcv.ops import (RoIAlign, SigmoidFocalLoss, get_compiler_version,
+                      get_compiling_cuda_version, nms, roi_align,
                       sigmoid_focal_loss)
 
 from .ball_query import ball_query
@@ -15,7 +16,6 @@ from .roiaware_pool3d import (RoIAwarePool3d, points_in_boxes_batch,
                               points_in_boxes_cpu, points_in_boxes_gpu)
 from .sparse_block import (SparseBasicBlock, SparseBottleneck,
                            make_sparse_convmodule)
-from .utils import get_compiler_version, get_compiling_cuda_version
 from .voxel import DynamicScatter, Voxelization, dynamic_scatter, voxelization
 
 __all__ = [