Don't use the heavyweight tf_stack in tf_decorator, which only needs the name of the parent frame. Remove package dependency.

PiperOrigin-RevId: 342145061
Change-Id: Ife96610c6795c0dac973332e37da1790b58491f0

tensorflow/python/BUILD

@@ -5696,12 +5696,12 @@ py_strict_library(
         "//learning/deepmind/research/language/translation/lm:__subpackages__",
     ],
     deps = [
-        ":tf_stack",
         "@six_archive//:six",
     ],
 )
 
-# Leaf library: may not depend on anything else inside TensorFlow.
+# Note: this is a heavyweight library specialized for TensorFlow graphs. Do not use for
+# other purposes.
 py_strict_library(
     name = "tf_stack",
     srcs = ["util/tf_stack.py"],

tensorflow/python/util/tf_decorator.py

@@ -61,8 +61,6 @@ from __future__ import print_function
 
 import inspect
 
-from tensorflow.python.util import tf_stack
-
 
 def make_decorator(target,
                    decorator_func,
@@ -84,8 +82,7 @@ def make_decorator(target,
     The `decorator_func` argument with new metadata attached.
   """
   if decorator_name is None:
-    frame = tf_stack.extract_stack(limit=2)[0]
-    decorator_name = frame.name
+    decorator_name = inspect.currentframe().f_back.f_code.co_name
   decorator = TFDecorator(decorator_name, target, decorator_doc,
                           decorator_argspec)
   setattr(decorator_func, '_tf_decorator', decorator)