Moving Labeling to proper namespace.

com.unity.perception/Editor/GroundTruth/LabelingEditor.cs

 using UnityEditorInternal;
 using UnityEngine;
+using UnityEngine.Perception.GroundTruth;
 
 namespace UnityEditor.Perception.GroundTruth
 {
 
         public void OnEnable()
         {
-            m_LabelsList = new ReorderableList(serializedObject, serializedObject.FindProperty(nameof(global::Labeling.labels)), true, false, true, true);
+            m_LabelsList = new ReorderableList(serializedObject, serializedObject.FindProperty(nameof(global::UnityEngine.Perception.GroundTruth.Labeling.labels)), true, false, true, true);
             m_LabelsList.drawElementCallback = DrawElement;
             m_LabelsList.onAddCallback += OnAdd;
             m_LabelsList.onRemoveCallback += OnRemove;

com.unity.perception/Runtime/GroundTruth/Labeling/Labeling.cs

 using UnityEngine;
 using UnityEngine.Serialization;
 
-/// <summary>
-/// Defines a set of labels associated with the object and its descendants. A Labeling component will override any Labeling components on the object's ancestors.
-/// </summary>
-public class Labeling : MonoBehaviour
+namespace UnityEngine.Perception.GroundTruth
-    /// The label names to associate with the GameObject.
+    /// Defines a set of labels associated with the object and its descendants. A Labeling component will override any Labeling components on the object's ancestors.
-    [FormerlySerializedAs("classes")]
-    public List<string> labels = new List<string>();
+    public class Labeling : MonoBehaviour
+    {
+        /// <summary>
+        /// The label names to associate with the GameObject.
+        /// </summary>
+        [FormerlySerializedAs("classes")]
+        public List<string> labels = new List<string>();
-    Entity m_Entity;
-    void Awake()
-    {
-        m_Entity = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity();
-        World.DefaultGameObjectInjectionWorld.EntityManager.AddComponentObject(m_Entity, this);
-    }
+        Entity m_Entity;
+        void Awake()
+        {
+            m_Entity = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity();
+            World.DefaultGameObjectInjectionWorld.EntityManager.AddComponentObject(m_Entity, this);
+        }
-    void OnDestroy()
-    {
-        if (World.DefaultGameObjectInjectionWorld != null)
-            World.DefaultGameObjectInjectionWorld.EntityManager.DestroyEntity(m_Entity);
+        void OnDestroy()
+        {
+            if (World.DefaultGameObjectInjectionWorld != null)
+                World.DefaultGameObjectInjectionWorld.EntityManager.DestroyEntity(m_Entity);
+        }
     }
 }

com.unity.perception/Tests/Runtime/GroundTruthTests/TestHelper.cs

 using System;
 using UnityEngine;
+using UnityEngine.Perception.GroundTruth;
 
 namespace GroundTruthTests
 {