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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 AbsoluteValue Bijector."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# pylint: disable=g-importing-member
from tensorflow.contrib.distributions.python.ops.bijectors.absolute_value import AbsoluteValue
from tensorflow.python.ops import array_ops
from tensorflow.python.ops import math_ops
from tensorflow.python.platform import test
# pylint: enable=g-importing-member
class AbsoluteValueTest(test.TestCase):
"""Tests correctness of the absolute value bijector."""
def testBijectorVersusNumpyRewriteOfBasicFunctionsEventNdims0(self):
with self.test_session() as sess:
bijector = AbsoluteValue(validate_args=True)
self.assertEqual("absolute_value", bijector.name)
x = array_ops.constant([[0., 1., -1], [0., -5., 3.]]) # Shape [2, 3]
y = math_ops.abs(x)
y_ = y.eval()
self.assertAllClose(y_, bijector.forward(x).eval())
self.assertAllClose((-y_, y_), sess.run(bijector.inverse(y)))
self.assertAllClose((0., 0.),
sess.run(bijector.inverse_log_det_jacobian(
y, event_ndims=0)))
# Run things twice to make sure there are no issues in caching the tuples
# returned by .inverse*
self.assertAllClose(y_, bijector.forward(x).eval())
self.assertAllClose((-y_, y_), sess.run(bijector.inverse(y)))
self.assertAllClose((0., 0.),
sess.run(bijector.inverse_log_det_jacobian(
y, event_ndims=0)))
def testNegativeYRaisesForInverseIfValidateArgs(self):
with self.test_session() as sess:
bijector = AbsoluteValue(validate_args=True)
with self.assertRaisesOpError("y was negative"):
sess.run(bijector.inverse(-1.))
def testNegativeYRaisesForILDJIfValidateArgs(self):
with self.test_session() as sess:
bijector = AbsoluteValue(validate_args=True)
with self.assertRaisesOpError("y was negative"):
sess.run(bijector.inverse_log_det_jacobian(-1., event_ndims=0))
if __name__ == "__main__":
test.main()
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