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# Copyright 2018 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.
# ==============================================================================
"""Test DistributionStrategy, TowerContext, and supporting APIs."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.python.ops import variable_scope
from tensorflow.python.platform import test
from tensorflow.python.training import distribute
class _TestTowerContext(distribute.TowerContext):
def merge_call(self, fn, *args, **kwargs):
return kwargs["test_arg"]
def _get_test_variable(name, synchronization, aggregation):
return {
"name": name,
"synchronization": synchronization,
"aggregation": aggregation
}
class _TestStrategy(distribute.DistributionStrategy):
def _call_for_each_tower(self, fn, *args, **kwargs):
with _TestTowerContext(self, tower_id=0):
return fn(*args, **kwargs)
def _create_variable(self, next_creator, *args, **kwargs):
return _get_test_variable(kwargs["name"], kwargs["synchronization"],
kwargs["aggregation"])
def _assert_in_default_state(t):
t.assertIs(distribute._default_tower_context,
distribute.get_tower_context())
t.assertIs(None, distribute.get_cross_tower_context())
t.assertIs(distribute._default_distribution_strategy,
distribute.get_distribution_strategy())
t.assertFalse(distribute.has_distribution_strategy())
class TestStrategyTest(test.TestCase):
def testCallForEachTower(self):
_assert_in_default_state(self)
dist = _TestStrategy()
def run_fn():
tower_context = distribute.get_tower_context()
self.assertTrue(tower_context is not None)
self.assertIs(None, distribute.get_cross_tower_context())
self.assertTrue(distribute.has_distribution_strategy())
self.assertIs(dist, distribute.get_distribution_strategy())
self.assertEqual("foo", tower_context.merge_call(None, test_arg="foo"))
expected_value = _get_test_variable(
"bar", variable_scope.VariableSynchronization.AUTO,
variable_scope.VariableAggregation.NONE)
self.assertDictEqual(expected_value,
variable_scope.variable(1.0, name="bar"))
with self.assertRaises(RuntimeError):
dist.call_for_each_tower(run_fn)
with dist.scope():
dist.call_for_each_tower(run_fn)
_assert_in_default_state(self)
def testScope(self):
_assert_in_default_state(self)
dist = _TestStrategy()
with dist.scope():
self.assertIs(None, distribute.get_tower_context())
self.assertIs(dist, distribute.get_cross_tower_context())
self.assertTrue(distribute.has_distribution_strategy())
self.assertIs(dist, distribute.get_distribution_strategy())
expected_value = _get_test_variable(
"baz", variable_scope.VariableSynchronization.AUTO,
variable_scope.VariableAggregation.NONE)
self.assertDictEqual(expected_value,
variable_scope.variable(1.0, name="baz"))
_assert_in_default_state(self)
def testSettingSynchronizationAndAggregation(self):
_assert_in_default_state(self)
dist = _TestStrategy()
with dist.scope():
expected_value = _get_test_variable(
"baz", variable_scope.VariableSynchronization.ON_WRITE,
variable_scope.VariableAggregation.MEAN)
self.assertDictEqual(
expected_value,
variable_scope.variable(
1.0,
name="baz",
synchronization=variable_scope.VariableSynchronization.ON_WRITE,
aggregation=variable_scope.VariableAggregation.MEAN))
_assert_in_default_state(self)
class DefaultDistributionStrategyTest(test.TestCase):
def testMergeCall(self):
_assert_in_default_state(self)
def merge_fn(dist, s):
self.assertIs(distribute._default_distribution_strategy, dist)
self.assertIs(None, distribute.get_tower_context())
self.assertIs(dist, distribute.get_cross_tower_context())
self.assertIs(dist, distribute.get_distribution_strategy())
self.assertFalse(distribute.has_distribution_strategy())
return "foo_" + s
tower_ctx = distribute.get_tower_context()
self.assertIs(distribute._default_tower_context, tower_ctx)
self.assertEqual("foo_bar", tower_ctx.merge_call(merge_fn, "bar"))
_assert_in_default_state(self)
if __name__ == "__main__":
test.main()
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