Remove tracking of inbound nodes/outbound nodes.

When building a Sequential model, clear_previously_created_nodes accidentally added tracking to the nodes attributes, which causes unnecessary warnings when loading a checkpoint.

PiperOrigin-RevId: 324923805
Change-Id: I7ee4457b70b16bb1a3b410f41327bba269a128e5

tensorflow/python/keras/engine/base_layer.py

@@ -382,8 +382,8 @@ class Layer(module.Module, version_utils.LayerVersionSelector):
     # These lists will be filled via successive calls
     # to self._add_inbound_node().
     # Used in symbolic mode only, only in conjunction with graph-networks
-    self._inbound_nodes = []
-    self._outbound_nodes = []
+    self._inbound_nodes_value = []
+    self._outbound_nodes_value = []
 
     self._init_call_fn_args()
 
@@ -2268,6 +2268,24 @@ class Layer(module.Module, version_utils.LayerVersionSelector):
   # Methods & attributes below are all private and only used by the framework. #
   ##############################################################################
 
+  @property
+  def _inbound_nodes(self):
+    return self._inbound_nodes_value
+
+  @_inbound_nodes.setter
+  @trackable.no_automatic_dependency_tracking
+  def _inbound_nodes(self, value):
+    self._inbound_nodes_value = value
+
+  @property
+  def _outbound_nodes(self):
+    return self._outbound_nodes_value
+
+  @_outbound_nodes.setter
+  @trackable.no_automatic_dependency_tracking
+  def _outbound_nodes(self, value):
+    self._outbound_nodes_value = value
+
   def _set_dtype_policy(self, dtype):
     """Sets self._dtype_policy."""
     if isinstance(dtype, policy.Policy):

tensorflow/python/keras/engine/base_layer_v1.py

@@ -217,8 +217,8 @@ class Layer(base_layer.Layer):
     # These lists will be filled via successive calls
     # to self._add_inbound_node().
     # Used in symbolic mode only, only in conjunction with graph-networks
-    self._inbound_nodes = []
-    self._outbound_nodes = []
+    self._inbound_nodes_value = []
+    self._outbound_nodes_value = []
 
     self._init_call_fn_args()
 
@@ -1740,6 +1740,24 @@ class Layer(base_layer.Layer):
   # Methods & attributes below are all private and only used by the framework. #
   ##############################################################################
 
+  @property
+  def _inbound_nodes(self):
+    return self._inbound_nodes_value
+
+  @_inbound_nodes.setter
+  @trackable.no_automatic_dependency_tracking
+  def _inbound_nodes(self, value):
+    self._inbound_nodes_value = value
+
+  @property
+  def _outbound_nodes(self):
+    return self._outbound_nodes_value
+
+  @_outbound_nodes.setter
+  @trackable.no_automatic_dependency_tracking
+  def _outbound_nodes(self, value):
+    self._outbound_nodes_value = value
+
   def _set_dtype_policy(self, dtype):
     """Sets self._dtype_policy."""
     if isinstance(dtype, policy.Policy):