diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09c16c9..74c52d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,6 @@ add_custom_command(OUTPUT "${CMAKE_CURRENT_SOURCE_DIR}/utils/_ext/pointnet2/_poi
 		   DEPENDS ${wrapper_sources}
 		   VERBATIM)
 
-add_custom_target(ext ALL
+add_custom_target(pointnet2_ext ALL
 		  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/utils/_ext/pointnet2/_pointnet2.so")
 
-set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${CMAKE_CURRENT_SOURCE_DIR}/utils/_ext")
diff --git a/data/data_utils.py b/data/data_utils.py
index eb47c33..427912a 100644
--- a/data/data_utils.py
+++ b/data/data_utils.py
@@ -31,7 +31,7 @@ def angle_axis(angle: float, axis: np.ndarray):
         + (1.0 - cosval) * np.outer(u, u)
     )
     # yapf: enable
-    return R
+    return R.float()
 
 
 class PointcloudScale(object):