Create Keras Optimizer non slot variables inside strategy scope if the optimizer is created inside strategy scope.

PiperOrigin-RevId: 308363394
Change-Id: If64c8cf449ad08d870ed39c764bbe3e2d368fd8e

tensorflow/python/keras/distribute/distribute_strategy_test.py

@@ -2394,17 +2394,13 @@ class TestModelCapturesStrategy(test.TestCase, parameterized.TestCase):
     # Make model with distribution strategy
     with distribution.scope():
       model = DeterministicModel(distribution)
-      optimizer = keras.optimizers.adam_v2.Adam(1e-4)
 
     # Compile & evaluate the model outside of the distribution strategy scope
     model.compile(
-        optimizer=optimizer,
+        optimizer=keras.optimizers.adam_v2.Adam(1e-4),
         loss=keras.losses.MeanSquaredError(),
         metrics=['binary_accuracy'])
 
-    # Call `optimizer.iterations` out of strategy scope.
-    self.assertEqual(model.optimizer.iterations.numpy(), 0)
-
     # Non-eager training doesn't support steps_per_epoch=None.
     for unused_epoch in range(2):
       model.fit(dataset)
@@ -2433,7 +2429,7 @@ class TestModelCapturesStrategy(test.TestCase, parameterized.TestCase):
     with distribution.scope():
       metric = keras.metrics.BinaryAccuracy()
     model.compile(
-        optimizer=optimizer,
+        optimizer=keras.optimizers.adam_v2.Adam(1e-4),
         loss=keras.losses.MeanSquaredError(),
         metrics=[metric])
 

tensorflow/python/keras/engine/training.py

@@ -1724,20 +1724,6 @@ class Model(network.Network, version_utils.ModelVersionSelector):
               'strategy scope.' % (metric, strategy)
           )
 
-    # Model metrics must be created in the same distribution strategy scope
-    # as the model.
-    for opt in nest.flatten(optimizer):
-      for v in getattr(opt, '_weights', []):
-        if not strategy.extended.variable_created_in_scope(v):
-          raise ValueError(
-              'Optimizer (%s) passed to model.compile was created inside of a '
-              'different distribution strategy scope than the model. All '
-              'optimizers must be created in the same distribution strategy '
-              'scope as the model (in this case %s). If you pass in a string '
-              'identifier for an optimizer to compile the optimizer will '
-              'automatically be created in the correct distribution '
-              'strategy scope.' % (opt, strategy))
-
   def _maybe_load_initial_epoch_from_ckpt(self, initial_epoch):
     """Maybe load initial epoch from ckpt considering possible worker recovery.
 

tensorflow/python/keras/optimizer_v2/optimizer_v2.py

@@ -20,7 +20,6 @@ from __future__ import division
 from __future__ import print_function
 
 import abc
-import contextlib
 import functools
 
 import six
@@ -338,13 +337,6 @@ class OptimizerV2(trackable.Trackable):
 
     self._hypers_created = False
 
-    # Store the distribution strategy object if the optimizer is created inside
-    # strategy scope, so it could be used to create variables later.
-    if distribute_ctx.has_strategy():
-      self._distribution_strategy = distribute_ctx.get_strategy()
-    else:
-      self._distribution_strategy = None
-
   def minimize(self, loss, var_list, grad_loss=None, name=None):
     """Minimize `loss` by updating `var_list`.
 
@@ -808,11 +800,10 @@ class OptimizerV2(trackable.Trackable):
   def _create_hypers(self):
     if self._hypers_created:
       return
-    with self._distribution_strategy_scope():
     # Iterate hyper values deterministically.
     for name, value in sorted(self._hyper.items()):
-        if isinstance(value,
-                      (ops.Tensor, tf_variables.Variable)) or callable(value):
+      if isinstance(
+          value, (ops.Tensor, tf_variables.Variable)) or callable(value):
         continue
       else:
         self._hyper[name] = self.add_weight(
@@ -827,7 +818,6 @@ class OptimizerV2(trackable.Trackable):
   def iterations(self):
     """Variable. The number of training steps this Optimizer has run."""
     if self._iterations is None:
-      with self._distribution_strategy_scope():
       self._iterations = self.add_weight(
           "iter",
           shape=[],
@@ -1243,15 +1233,6 @@ class OptimizerV2(trackable.Trackable):
           slot_name, {}).setdefault(variable_key, []).append(
               slot_variable_position)
 
-  @contextlib.contextmanager
-  def _distribution_strategy_scope(self):
-    """Returns the `tf.distribute.Strategy` this optimizer was created under."""
-    if self._distribution_strategy and not distribute_ctx.has_strategy():
-      with self._distribution_strategy.scope():
-        yield self._distribution_strategy.scope()
-    else:
-      yield
-
 
 def _filter_grads(grads_and_vars):
   """Filter out iterable with grad equal to None."""