Move AutoGraph to core. This CL moves the entirety of the code base, keeping the frontend autograph module in contrib for backward compatibility. Certain files, like notebooks and the readme file may be referenced from the outside, so a copy of those is kept as well. In addition, the notebooks subdirectory of examples is also kept in contrib because the extension the build file relies on is not available in the PIP package.

PiperOrigin-RevId: 212543067

1 files changed, 137 insertions, 0 deletions

diff --git a/tensorflow/python/autograph/pyct/static_analysis/live_values.py b/tensorflow/python/autograph/pyct/static_analysis/live_values.py
new file mode 100644
index 0000000000..48b442f3bd
--- /dev/null
+++ b/tensorflow/python/autograph/pyct/static_analysis/live_values.py
@@ -0,0 +1,137 @@
+# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Live value resolution.
+
+Live values are extracted from the known execution context.
+
+Requires activity and reaching definitions analyses.
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import gast
+
+from tensorflow.python.autograph.pyct import anno
+from tensorflow.python.autograph.pyct import transformer
+from tensorflow.python.autograph.pyct.static_analysis.annos import NodeAnno
+
+# TODO(aqj): Do we need this? Do other builtins fail in similar ways
+# See b/114389775 for a related bug in pyct
+# These symbols are legal in Python, but don't appear in the namespace.
+_special_symbols = {'range': range}
+
+
+class LiveValueResolver(transformer.Base):
+  """Annotates nodes with live values."""
+
+  def __init__(self, context, literals):
+    super(LiveValueResolver, self).__init__(context)
+    self.literals = literals
+
+  def visit_ClassDef(self, node):
+    self.generic_visit(node)
+    anno.setanno(node, 'live_val', self.entity_info.namespace[node.name])
+    return node
+
+  def visit_Name(self, node):
+    self.generic_visit(node)
+    if isinstance(node.ctx, gast.Load):
+      defs = anno.getanno(node, anno.Static.DEFINITIONS, ())
+
+      is_defined = bool(defs)
+      has_single_def = len(defs) == 1
+
+      if not is_defined:
+        if node.id in self.literals:
+          anno.setanno(node, 'live_val', self.literals[node.id])
+        elif node.id in self.entity_info.namespace:
+          obj = self.entity_info.namespace[node.id]
+          anno.setanno(node, 'live_val', obj)
+          if hasattr(obj, '__name__'):
+            anno.setanno(node, 'fqn', (obj.__name__,))
+          elif hasattr(obj, '__class__'):
+            obj_class = obj.__class__
+            anno.setanno(node, 'fqn',
+                         (obj_class.__module__, obj_class.__name__))
+          else:
+            # If the symbol value is for example a primitive, then it will not
+            # have a name.
+            pass
+        elif node.id in _special_symbols:
+          anno.setanno(node, 'live_val', _special_symbols[node.id])
+        else:
+          pass
+          # TODO(mdan): Should we raise an error here?
+          # Can encounter this when:
+          #  * a symbol truly lacks reference
+          #  * a symbol is new, like the new name of a function we just renamed.
+      else:
+        pass
+        # TODO(mdan): Attempt to trace its value through the local chain.
+        # TODO(mdan): Use type annotations as fallback.
+
+      if has_single_def:
+        def_, = defs
+        if def_.param_of is self.enclosing_entities[0]:
+          if node.id in self.entity_info.arg_values:
+            obj = self.entity_info.arg_values[node.id]
+            anno.setanno(node, 'live_val', obj)
+            anno.setanno(node, 'fqn', (obj.__class__.__name__,))
+    return node
+
+  def visit_Attribute(self, node):
+    self.generic_visit(node)
+    if anno.hasanno(node.value, 'live_val'):
+      assert anno.hasanno(node.value, 'fqn')
+      parent_object = anno.getanno(node.value, 'live_val')
+
+      anno.setanno(node, 'parent_type', type(parent_object))
+      anno.setanno(node, 'fqn', anno.getanno(node.value, 'fqn') + (node.attr,))
+      if hasattr(parent_object, node.attr):
+        # This can happen when the attribute's creation and use depend on the
+        # same static condition, for example:
+        #
+        #  if cond:
+        #    foo.bar = baz
+        #  if cond:
+        #    x = foo.bar
+        #
+        anno.setanno(node, 'live_val', getattr(parent_object, node.attr))
+
+    # TODO(mdan): Investigate the role built-in annotations can play here.
+    elif anno.hasanno(node.value, 'type'):
+      parent_type = anno.getanno(node.value, 'type')
+      if hasattr(parent_type, node.attr):
+        # This should hold for static members like methods.
+        # This would not hold for dynamic members like function attributes.
+        # For the dynamic case, we simply leave the node without an annotation,
+        # and let downstream consumers figure out what to do.
+        anno.setanno(node, 'parent_type', parent_type)
+        anno.setanno(node, 'live_val', getattr(parent_type, node.attr))
+        anno.setanno(node, 'fqn',
+                     anno.getanno(node.value, 'type_fqn') + (node.attr,))
+    elif isinstance(node.value, gast.Name):
+      stem_name = node.value
+      # All nonlocal symbols should be fully resolved.
+      assert anno.hasanno(stem_name, NodeAnno.IS_LOCAL), stem_name
+      # TODO(mdan): Figure out what to do when calling attribute on local object
+      # Maybe just leave as-is?
+    return node
+
+
+def resolve(node, context, literals):
+  return LiveValueResolver(context, literals).visit(node)