Replace usage of Graph._building_function with a public one

Not sure why people use it in the first place.

PiperOrigin-RevId: 293885535
Change-Id: Ibdd3bc050b29b3fe88aebee4e3f6c804fe21813e

tensorflow/python/data/kernel_tests/test_base.py

@@ -105,8 +105,7 @@ class DatasetTestBase(test.TestCase):
 
     # Create an anonymous iterator if we are in eager-mode or are graph inside
     # of a tf.function.
-    building_function = ops.get_default_graph()._building_function  # pylint: disable=protected-access
-    if context.executing_eagerly() or building_function:
+    if context.executing_eagerly() or ops.inside_function():
       iterator = iter(dataset)
       return ta_wrapper(iterator._next_internal)  # pylint: disable=protected-access
     else:

tensorflow/python/data/ops/dataset_ops.py

@@ -400,8 +400,7 @@ class DatasetV2(tracking_base.Trackable, composite_tensor.CompositeTensor):
     Raises:
       RuntimeError: If not inside of tf.function and not executing eagerly.
     """
-    if (context.executing_eagerly()
-        or ops.get_default_graph()._building_function):  # pylint: disable=protected-access
+    if context.executing_eagerly() or ops.inside_function():
       return iterator_ops.OwnedIterator(self)
     else:
       raise RuntimeError("__iter__() is only supported inside of tf.function "
@@ -3446,8 +3445,7 @@ class CacheDataset(UnaryUnchangedStructureDataset):
     self._input_dataset = input_dataset
     self._filename = ops.convert_to_tensor(
         filename, dtype=dtypes.string, name="filename")
-    if tf2.enabled() and (context.executing_eagerly() or
-                          ops.get_default_graph()._building_function):  # pylint: disable=protected-access
+    if tf2.enabled() and (context.executing_eagerly() or ops.inside_function()):
       self._cache = _MemoryCache()
       variant_tensor = gen_dataset_ops.cache_dataset_v2(
           input_dataset._variant_tensor,  # pylint: disable=protected-access
@@ -3542,8 +3540,7 @@ class ShuffleDataset(UnaryUnchangedStructureDataset):
       self._reshuffle_each_iteration = reshuffle_each_iteration
 
     if tf2.enabled() and self._reshuffle_each_iteration and (
-        context.executing_eagerly() or
-        ops.get_default_graph()._building_function):  # pylint: disable=protected-access
+        context.executing_eagerly() or ops.inside_function()):
       self._seed_generator = _RandomSeedGenerator(self._seed, self._seed2)
       variant_tensor = gen_dataset_ops.shuffle_dataset_v2(
           input_dataset._variant_tensor,  # pylint: disable=protected-access

tensorflow/python/data/ops/multi_device_iterator_ops.py

@@ -490,8 +490,7 @@ class OwnedMultiDeviceIterator(composite_tensor.CompositeTensor):
       RuntimeError: If executed in graph mode or outside of function building
       mode.
     """
-    if (not context.executing_eagerly() and
-        not ops.get_default_graph()._building_function):  # pylint: disable=protected-access
+    if not context.executing_eagerly() and not ops.inside_function():
       raise RuntimeError("OwnedMultiDeviceIterator is only supported inside of "
                          "tf.function or when eager execution is enabled.")
     if devices is None:

tensorflow/python/framework/ops.py

@@ -723,7 +723,7 @@ class Tensor(_TensorLike):
   def __hash__(self):
     g = getattr(self, "graph", None)
     if (Tensor._USE_EQUALITY and executing_eagerly_outside_functions() and
-        (g is None or g._building_function)):  # pylint: disable=protected-access
+        (g is None or g.building_function)):
       raise TypeError("Tensor is unhashable if Tensor equality is enabled. "
                       "Instead, use tensor.experimental_ref() as the key.")
     else:

tensorflow/python/framework/test_util.py

@@ -1147,7 +1147,7 @@ def run_in_graph_and_eager_modes(func=None,
 def py_func_if_in_function(f):
 
   def decorated(*args, **kwds):
-    if not ops.get_default_graph()._building_function:
+    if not ops.inside_function():
       return f(*args, **kwds)
 
     tensor_args = []

tensorflow/python/framework/test_util_test.py

@@ -756,8 +756,7 @@ class TestUtilTest(test_util.TensorFlowTestCase, parameterized.TestCase):
 
       @test_util.build_as_function_and_v1_graph
       def test_modes(inner_self):  # pylint: disable=no-self-argument
-        is_building_function = ops.get_default_graph().building_function
-        if is_building_function:
+        if ops.inside_function():
           self.assertFalse(inner_self.inside_function_tested)
           inner_self.inside_function_tested = True
         else:

tensorflow/python/ops/control_flow_state.py

@@ -659,7 +659,7 @@ class _ControlFlowState(object):
     """
     if util.IsLoopSwitch(op):
       return None
-    if op.graph._building_function:  # pylint: disable=protected-access
+    if op.graph.building_function:
       # The optimization here is tricky to apply to functions
       return array_ops.zeros_like(op.outputs[index])
     dead_branch = util.IsSwitch(op)

tensorflow/python/ops/math_ops.py

@@ -1487,7 +1487,7 @@ def tensor_equals(self, other):
     return False
   g = getattr(self, "graph", None)
   if (ops.Tensor._USE_EQUALITY and ops.executing_eagerly_outside_functions() and
-      (g is None or g._building_function)):  # pylint: disable=protected-access
+      (g is None or g.building_function)):
     return gen_math_ops.equal(self, other, incompatible_shape_error=False)
   else:
     # In legacy graph mode, tensor equality is object equality

tensorflow/python/ops/resource_variable_ops.py

@@ -1839,8 +1839,7 @@ class _UnreadVariable(BaseResourceVariable):
     # Only create a graph_element if we're in session.run-land as only
     # session.run requires a preexisting tensor to evaluate. Otherwise we can
     # avoid accidentally reading the variable.
-    if (context.executing_eagerly()
-        or ops.get_default_graph()._building_function):  # pylint: disable=protected-access
+    if context.executing_eagerly() or ops.inside_function():
       graph_element = None
     else:
       with ops.control_dependencies([parent_op]):

tensorflow/python/util/tf_should_use.py

@@ -49,7 +49,7 @@ class _TFShouldUseHelper(object):
     if context.executing_eagerly():
       # If warn_in_eager, sated == False.  Otherwise true.
       self._sated = not warn_in_eager
-    elif ops.get_default_graph()._building_function:  # pylint: disable=protected-access
+    elif ops.inside_function():
       if error_in_function:
         self._sated = False
         ops.add_exit_callback_to_default_func_graph(
@@ -182,7 +182,7 @@ def _add_should_use_warning(x, error_in_function=False, warn_in_eager=False):
   if context.executing_eagerly() and not warn_in_eager:
     return x
 
-  if ops.get_default_graph()._building_function and not error_in_function:  # pylint: disable=protected-access
+  if ops.inside_function() and not error_in_function:
     # We don't currently log warnings in tf.function calls, so just skip it.
     return x