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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.
# ==============================================================================
"""Tests for control_flow module."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.contrib.autograph.converters import control_flow
from tensorflow.contrib.autograph.core import converter_testing
from tensorflow.python.framework import constant_op
from tensorflow.python.framework import dtypes
from tensorflow.python.ops import array_ops
from tensorflow.python.ops import control_flow_ops
from tensorflow.python.platform import test
class ControlFlowTest(converter_testing.TestCase):
def test_simple_while(self):
def test_fn(n):
i = 0
s = 0
while i < n:
s += i
i += 1
return s, i, n
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
self.assertEqual((10, 5, 5),
sess.run(result.test_fn(constant_op.constant(5))))
def test_while_single_var(self):
def test_fn(n):
while n > 0:
n -= 1
return n
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
self.assertEqual(0, sess.run(result.test_fn(constant_op.constant(5))))
def test_simple_if(self):
def test_fn(n):
a = 0
b = 0
if n > 0:
a = -n
else:
b = 2 * n
return a, b
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
self.assertEqual((-1, 0),
sess.run(result.test_fn(constant_op.constant(1))))
self.assertEqual((0, -2),
sess.run(result.test_fn(constant_op.constant(-1))))
def test_if_single_var(self):
def test_fn(n):
if n > 0:
n = -n
return n
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
self.assertEqual(-1, sess.run(result.test_fn(constant_op.constant(1))))
def test_imbalanced_aliasing(self):
def test_fn(n):
if n > 0:
n = 3
return n
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node, control_flow_ops.cond) as result:
with self.test_session() as sess:
self.assertEqual(3, sess.run(result.test_fn(constant_op.constant(2))))
self.assertEqual(-3, sess.run(result.test_fn(constant_op.constant(-3))))
def test_ignore_unread_variable(self):
def test_fn(n):
b = 3 # pylint: disable=unused-variable
if n > 0:
b = 4
return n
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node, control_flow_ops.cond, array_ops.ones) as result:
with self.test_session() as sess:
self.assertEqual(3, sess.run(result.test_fn(constant_op.constant(3))))
self.assertEqual(-3, sess.run(result.test_fn(constant_op.constant(-3))))
def test_handle_temp_variable(self):
def test_fn_using_temp(x, y, w):
if x < y:
z = x + y
else:
w = 2
tmp = w
z = x - tmp
return z, w
node = self.parse_and_analyze(test_fn_using_temp, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node, control_flow_ops.cond, array_ops.ones) as result:
with self.test_session() as sess:
z, w = sess.run(
result.test_fn_using_temp(
constant_op.constant(-3), constant_op.constant(3),
constant_op.constant(3)))
self.assertEqual(0, z)
self.assertEqual(3, w)
z, w = sess.run(
result.test_fn_using_temp(
constant_op.constant(3), constant_op.constant(-3),
constant_op.constant(3)))
self.assertEqual(1, z)
self.assertEqual(2, w)
def test_fn_ignoring_temp(x, y, w):
if x < y:
z = x + y
else:
w = 2
tmp = w
z = x - tmp
return z
node = self.parse_and_analyze(test_fn_ignoring_temp, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node, control_flow_ops.cond, array_ops.ones) as result:
with self.test_session() as sess:
z = sess.run(
result.test_fn_ignoring_temp(
constant_op.constant(-3), constant_op.constant(3),
constant_op.constant(3)))
self.assertEqual(0, z)
z = sess.run(
result.test_fn_ignoring_temp(
constant_op.constant(3), constant_op.constant(-3),
constant_op.constant(3)))
self.assertEqual(1, z)
def test_simple_for(self):
def test_fn(l):
s1 = 0
s2 = 0
for e in l:
s1 += e
s2 += e * e
return s1, s2
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
l = [1, 2, 3]
self.assertEqual(
test_fn(l), sess.run(result.test_fn(constant_op.constant(l))))
l = []
self.assertEqual(
test_fn(l),
sess.run(
result.test_fn(
constant_op.constant(l, shape=(0,), dtype=dtypes.int32))))
def test_for_single_var(self):
def test_fn(l):
s = 0
for e in l:
s += e
return s
node = self.parse_and_analyze(test_fn, {})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
with self.test_session() as sess:
l = [1, 2, 3]
self.assertEqual(
test_fn(l), sess.run(result.test_fn(constant_op.constant(l))))
l = []
self.assertEqual(
test_fn(l),
sess.run(
result.test_fn(
constant_op.constant(l, shape=(0,), dtype=dtypes.int32))))
def test_for_with_iterated_expression(self):
eval_count = [0]
def count_evals(x):
eval_count[0] += 1
return x
def test_fn(n):
s = 0
for e in count_evals(range(n)):
s += e
return s
node = self.parse_and_analyze(test_fn, {'count_evals': count_evals})
node = control_flow.transform(node, self.ctx)
with self.compiled(node) as result:
result.count_evals = count_evals
self.assertEqual(test_fn(5), result.test_fn(5))
# count_evals ran twice, once for test_fn and another for result.test_fn
self.assertEqual(eval_count[0], 2)
if __name__ == '__main__':
test.main()
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