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# 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.
# ==============================================================================
"""Unit tests for tf_should_use."""
# pylint: disable=unused-import
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import contextlib
import gc
import sys
from tensorflow.python.framework import constant_op
from tensorflow.python.platform import test
from tensorflow.python.platform import tf_logging
from tensorflow.python.util import tf_should_use
@contextlib.contextmanager
def reroute_error():
"""Temporarily reroute errors written to tf_logging.error into `captured`."""
with test.mock.patch.object(tf_should_use.tf_logging, 'error') as error:
with test.mock.patch.object(tf_should_use.tf_logging, 'fatal') as fatal:
yield error, fatal
class TfShouldUseTest(test.TestCase):
def testAddShouldUseWarningWhenNotUsed(self):
c = constant_op.constant(0, name='blah0')
def in_this_function():
h = tf_should_use._add_should_use_warning(c)
del h
with reroute_error() as (error, _):
in_this_function()
msg = '\n'.join(error.call_args[0])
self.assertIn('Object was never used', msg)
self.assertIn('blah0:0', msg)
self.assertIn('in_this_function', msg)
self.assertFalse(gc.garbage)
def testAddShouldUseFatalWhenNotUsed(self):
c = constant_op.constant(0, name='blah0')
def in_this_function():
h = tf_should_use._add_should_use_warning(c, fatal_error=True)
del h
with reroute_error() as (_, fatal):
in_this_function()
msg = '\n'.join(fatal.call_args[0])
self.assertIn('Object was never used', msg)
self.assertIn('blah0:0', msg)
self.assertIn('in_this_function', msg)
self.assertFalse(gc.garbage)
def _testAddShouldUseWarningWhenUsed(self, fn, name):
c = constant_op.constant(0, name=name)
with reroute_error() as (error, fatal):
h = tf_should_use._add_should_use_warning(c)
fn(h)
del h
error.assert_not_called()
fatal.assert_not_called()
def testAddShouldUseWarningWhenUsedWithAdd(self):
def add(h):
_ = h + 1
self._testAddShouldUseWarningWhenUsed(add, name='blah_add')
gc.collect()
self.assertFalse(gc.garbage)
def testAddShouldUseWarningWhenUsedWithGetName(self):
def get_name(h):
_ = h.name
self._testAddShouldUseWarningWhenUsed(get_name, name='blah_get_name')
gc.collect()
self.assertFalse(gc.garbage)
def testShouldUseResult(self):
@tf_should_use.should_use_result
def return_const(value):
return constant_op.constant(value, name='blah2')
with reroute_error() as (error, _):
return_const(0.0)
msg = '\n'.join(error.call_args[0])
self.assertIn('Object was never used', msg)
self.assertIn('blah2:0', msg)
self.assertIn('return_const', msg)
gc.collect()
self.assertFalse(gc.garbage)
def testShouldUseResultWhenNotReallyUsed(self):
@tf_should_use.should_use_result
def return_const(value):
return constant_op.constant(value, name='blah3')
with reroute_error() as (error, _):
with self.test_session():
return_const(0.0)
# Creating another op and executing it does not mark the
# unused op as being "used".
v = constant_op.constant(1.0, name='meh')
v.eval()
msg = '\n'.join(error.call_args[0])
self.assertIn('Object was never used', msg)
self.assertIn('blah3:0', msg)
self.assertIn('return_const', msg)
gc.collect()
self.assertFalse(gc.garbage)
# Tests that mark_used is available in the API.
def testMarkUsed(self):
@tf_should_use.should_use_result
def return_const(value):
return constant_op.constant(value, name='blah3')
with self.test_session():
return_const(0.0).mark_used()
if __name__ == '__main__':
test.main()
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