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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.
# ==============================================================================
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.python.eager import def_function
from tensorflow.python.framework import constant_op
from tensorflow.python.framework import ops
from tensorflow.python.ops import variables
from tensorflow.python.platform import test
class DefFunctionTest(test.TestCase):
def testNoVariables(self):
@def_function.function
def fn(x):
return 2 * x
self.assertAllEqual(fn(constant_op.constant(4.0)), 8.0)
def testFailIfVariablesAreCreatedMoreThanOnce(self):
@def_function.function
def fn(x):
return variables.Variable(1.0) + x
with self.assertRaises(ValueError):
fn(1.0)
def testFailIfVariablesAreCreatedMoreThanOnceNoWeakRef(self):
state = []
@def_function.function
def fn(x):
state.append(variables.Variable(1.0))
return state[-1] + x
with self.assertRaises(ValueError):
fn(1.0)
def testCorrectVariableCreation(self):
state = []
@def_function.function
def fn(x):
if not state:
state.append(variables.Variable(2.0))
return state[0] * x
self.assertAllEqual(fn(constant_op.constant(1.0)), 2.0)
self.assertAllEqual(fn(constant_op.constant(3.0)), 6.0)
def testVariableInitializerNotConstant(self):
state = []
@def_function.function
def fn(x):
if not state:
state.append(variables.Variable(2.0 * x))
return state[0] * x
self.assertAllEqual(fn(constant_op.constant(1.0)), 2.0)
self.assertAllEqual(fn(constant_op.constant(3.0)), 6.0)
def testMethod(self):
class MyModel(object):
def __init__(self):
self.var = None
@def_function.function
def apply(self, x):
if self.var is None:
self.var = variables.Variable(2.0)
return self.var * x
m0 = MyModel()
self.assertAllEqual(m0.apply(3.0), 6.0)
# Calling twice to exercise that we do not recreate variables.
m0.var.assign(3.0)
self.assertAllEqual(m0.apply(3.0), 9.0)
m1 = MyModel()
self.assertAllEqual(m1.apply(3.0), 6.0)
if __name__ == '__main__':
ops.enable_eager_execution()
test.main()
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