Changing the behavior of tensor_util.is_tensor(x) not to return True if x is a subclass of CompositeTensro.

PiperOrigin-RevId: 246893379

tensorflow/python/framework/ops_test.py

@@ -3116,7 +3116,7 @@ class CustomConvertToCompositeTensorTest(test_util.TensorFlowTestCase):
     """Tests that a user can register a CompositeTensor converter."""
     x = _MyTuple((1, [2., 3.], [[4, 5], [6, 7]]))
     y = ops.convert_to_tensor_or_composite(x)
-    self.assertTrue(tensor_util.is_tensor(y))
+    self.assertFalse(tensor_util.is_tensor(y))
     self.assertIsInstance(y, _TupleTensor)
     self.assertLen(y, len(x))
     for x_, y_ in zip(x, y):

tensorflow/python/framework/sparse_tensor.py

@@ -175,7 +175,7 @@ class SparseTensor(_TensorLike, composite_tensor.CompositeTensor):
   @property
   def op(self):
     """The `Operation` that produces `values` as an output."""
-    return self.values.op
+    return self._values.op
 
   @property
   def dtype(self):

tensorflow/python/framework/tensor_util.py

@@ -22,7 +22,6 @@ import six
 
 from tensorflow.core.framework import tensor_pb2
 from tensorflow.core.framework import tensor_shape_pb2
-from tensorflow.python.framework import composite_tensor
 from tensorflow.python.framework import ops
 from tensorflow.python.framework import tensor_shape
 from tensorflow.python.util import compat
@@ -939,20 +938,16 @@ def constant_value_as_shape(tensor):  # pylint: disable=invalid-name
 
 @tf_export("is_tensor")
 def is_tensor(x):  # pylint: disable=invalid-name
-  """Check whether `x` is of tensor type.
+  """Checks whether `x` is a tensor or "tensor-like".
 
-  Check whether an object is a tensor or a composite tensor. This check is
-  equivalent to calling
-  `isinstance(x, (tf.Tensor, tf.SparseTensor, tf.RaggedTensor, tf.Variable))`
-  and also checks if all the component variables of a MirroredVariable or a
-  SyncOnReadVariable are tensors.
+  If `is_tensor(x)` returns `True`, it is safe to assume that `x` is a tensor or
+  can be converted to a tensor using `ops.convert_to_tensor(x)`.
 
   Args:
     x: A python object to check.
 
   Returns:
-    `True` if `x` is a tensor, `False` if not.
+    `True` if `x` is a tensor or "tensor-like", `False` if not.
   """
   return (isinstance(x, ops._TensorLike) or ops.is_dense_tensor_like(x) or  # pylint: disable=protected-access
-          isinstance(x, composite_tensor.CompositeTensor) or
-          (hasattr(x, "is_tensor_like") and x.is_tensor_like))
+          getattr(x, "is_tensor_like", False))

tensorflow/python/ops/cond_v2.py

@@ -479,7 +479,7 @@ def _make_inputs_match(true_graph, false_graph, true_inputs, false_inputs):
 
 
 def _make_output_composite_tensors_match(true_graph, false_graph):
-  """Rewrites {true,false}_graph's outputs to use the same _TensorLike classes.
+  """Modifies true_graph and false_graph so they have the same output signature.
 
   Currently the only transformation implemented is turning a Tensor into an
   equivalent IndexedSlices if the other branch returns an IndexedSlices.

tensorflow/python/ops/ragged/ragged_tensor.py

@@ -40,7 +40,6 @@ from tensorflow.python.util.tf_export import tf_export
 
 # pylint: disable=protected-access
 _eval_using_default_session = ops._eval_using_default_session
-
 # pylint: enable=protected-access
 
 #===============================================================================