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# Copyright 2016 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.
# ==============================================================================
"""Chain Tests."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import numpy as np
from tensorflow.contrib.distributions.python.ops.bijectors import bijector_test_util
from tensorflow.contrib.distributions.python.ops.bijectors import chain as chain_lib
from tensorflow.contrib.distributions.python.ops.bijectors import exp as exp_lib
from tensorflow.contrib.distributions.python.ops.bijectors import softmax_centered as softmax_centered_lib
from tensorflow.contrib.distributions.python.ops.bijectors import softplus as softplus_lib
from tensorflow.python.framework import tensor_shape
from tensorflow.python.platform import test
class ChainBijectorTest(test.TestCase):
"""Tests the correctness of the Y = Chain(bij1, bij2, bij3) transformation."""
def testBijector(self):
with self.test_session():
chain = chain_lib.Chain((exp_lib.Exp(event_ndims=1),
softplus_lib.Softplus(event_ndims=1)))
self.assertEqual("chain_of_exp_of_softplus", chain.name)
x = np.asarray([[[1., 2.],
[2., 3.]]])
self.assertAllClose(1. + np.exp(x), chain.forward(x).eval())
self.assertAllClose(np.log(x - 1.), chain.inverse(x).eval())
self.assertAllClose(
-np.sum(np.log(x - 1.), axis=2),
chain.inverse_log_det_jacobian(x).eval())
self.assertAllClose(
np.sum(x, axis=2), chain.forward_log_det_jacobian(x).eval())
def testBijectorIdentity(self):
with self.test_session():
chain = chain_lib.Chain()
self.assertEqual("identity", chain.name)
x = np.asarray([[[1., 2.],
[2., 3.]]])
self.assertAllClose(x, chain.forward(x).eval())
self.assertAllClose(x, chain.inverse(x).eval())
self.assertAllClose(0., chain.inverse_log_det_jacobian(x).eval())
self.assertAllClose(0., chain.forward_log_det_jacobian(x).eval())
def testScalarCongruency(self):
with self.test_session():
bijector = chain_lib.Chain((exp_lib.Exp(), softplus_lib.Softplus()))
bijector_test_util.assert_scalar_congruency(
bijector, lower_x=1e-3, upper_x=1.5, rtol=0.05)
def testShapeGetters(self):
with self.test_session():
bijector = chain_lib.Chain([
softmax_centered_lib.SoftmaxCentered(
event_ndims=1, validate_args=True),
softmax_centered_lib.SoftmaxCentered(
event_ndims=0, validate_args=True)])
x = tensor_shape.TensorShape([])
y = tensor_shape.TensorShape([2 + 1])
self.assertAllEqual(y, bijector.forward_event_shape(x))
self.assertAllEqual(
y.as_list(),
bijector.forward_event_shape_tensor(x.as_list()).eval())
self.assertAllEqual(x, bijector.inverse_event_shape(y))
self.assertAllEqual(
x.as_list(),
bijector.inverse_event_shape_tensor(y.as_list()).eval())
if __name__ == "__main__":
test.main()
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