Catch name errors, in case these symbols are not injected.

PiperOrigin-RevId: 266214332

tensorflow/virtual_root_template_v1.__init__.py

@@ -104,4 +104,29 @@ if not isinstance(_sys.modules[__name__], _deprecation.DeprecationWrapper):
   _sys.modules[__name__] = _deprecation.DeprecationWrapper(
       _sys.modules[__name__], "")
 
+# These should not be visible in the main tf module.
+try:
+  del core
+except NameError:
+  pass
+
+try:
+  del python
+except NameError:
+  pass
+
+try:
+  del compiler
+except NameError:
+  pass
+
+try:
+  del tools
+except NameError:
+  pass
+
+try:
+  del examples
+except NameError:
+  pass
 # LINT.ThenChange(//tensorflow/virtual_root_template_v2.__init__.py.oss)

tensorflow/virtual_root_template_v2.__init__.py

@@ -97,4 +97,29 @@ for _m in _top_level_modules:
 # We still need all the names that are toplevel on tensorflow_core
 from tensorflow_core import *
 
+# These should not be visible in the main tf module.
+try:
+  del core
+except NameError:
+  pass
+
+try:
+  del python
+except NameError:
+  pass
+
+try:
+  del compiler
+except NameError:
+  pass
+
+try:
+  del tools
+except NameError:
+  pass
+
+try:
+  del examples
+except NameError:
+  pass
 # LINT.ThenChange(//tensorflow/virtual_root_template_v1.__init__.py.oss)