Rewrite the module whitelist into a basic rule-based set that allows both explicit whitelisting and non-whitelisting (e.g. to override a broader whitelist).

PiperOrigin-RevId: 250323405

tensorflow/python/autograph/core/config.py

@@ -18,17 +18,11 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 
+import enum
+
 from tensorflow.python.autograph import utils
 
 
-PYTHON_LITERALS = {
-    'None': None,
-    'False': False,
-    'True': True,
-    'float': float,
-}
-
-
 def _internal_name(name):
   """This function correctly resolves internal and external names."""
   reference_name = utils.__name__
@@ -47,14 +41,58 @@ def _internal_name(name):
   return root_prefix + '.' + name
 
 
-DEFAULT_UNCOMPILED_MODULES = set((
-    ('tensorflow',),
-    (_internal_name('tensorflow'),),
-    # TODO(mdan): Remove once the conversion process is optimized.
-    ('tensorflow_probability',),
-    (_internal_name('tensorflow_probability'),),
+class Rule(object):
+  """Base class for conversion rules."""
+
+  def __init__(self, module_prefix):
+    self._prefix = module_prefix
+
+  def matches(self, module_name):
+    return (module_name.startswith(self._prefix + '.') or
+            module_name == self._prefix)
+
+
+class Action(enum.Enum):
+  NONE = 0
+  CONVERT = 1
+  DO_NOT_CONVERT = 2
+
+
+class DoNotConvert(Rule):
+  """Indicates that this module should be not converted."""
+
+  def __str__(self):
+    return 'DoNotConvert rule for {}'.format(self._prefix)
+
+  def get_action(self, module):
+    if self.matches(module.__name__):
+      return Action.DO_NOT_CONVERT
+    return Action.NONE
+
+
+class Convert(Rule):
+  """Indicates that this module should be converted."""
+
+  def __str__(self):
+    return 'Convert rule for {}'.format(self._prefix)
+
+  def get_action(self, module):
+    if self.matches(module.__name__):
+      return Action.CONVERT
+    return Action.NONE
+
+
+# This list is evaluated in order and stops at the first rule that tests True
+# for a definitely_convert of definitely_bypass call.
+CONVERSION_RULES = (
+    DoNotConvert('tensorflow'),
+    DoNotConvert(_internal_name('tensorflow')),
+
+    # TODO(b/133417201): Remove.
+    DoNotConvert('tensorflow_probability'),
+    DoNotConvert(_internal_name('tensorflow_probability')),
+
     # TODO(b/130313089): Remove.
-    ('numpy',),
-    # TODO(mdan): Might need to add "thread" as well?
-    ('threading',),
-))
+    DoNotConvert('numpy'),
+    DoNotConvert('threading'),
+)

tensorflow/python/autograph/impl/conversion.py

@@ -333,11 +333,15 @@ def is_whitelisted_for_graph(o, check_call_override=True):
   else:
     m = tf_inspect.getmodule(o)
 
+  # Examples of callables that lack a __module__ property include builtins.
   if hasattr(m, '__name__'):
-    # Builtins typically have unnamed modules.
-    for prefix, in config.DEFAULT_UNCOMPILED_MODULES:
-      if m.__name__.startswith(prefix + '.') or m.__name__ == prefix:
-        logging.log(2, 'Whitelisted: %s: name starts with "%s"', o, prefix)
+    for rule in config.CONVERSION_RULES:
+      action = rule.get_action(m)
+      if action == config.Action.CONVERT:
+        logging.log(2, 'Not whitelisted: %s: %s', o, rule)
+        return False
+      elif action == config.Action.DO_NOT_CONVERT:
+        logging.log(2, 'Whitelisted: %s: %s', o, rule)
         return True
 
   if hasattr(o, 'autograph_info__') or hasattr(o, '__ag_compiled'):