| # 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 random-number generation ops in the XLA JIT compiler.""" |
| |
| from __future__ import absolute_import |
| from __future__ import division |
| from __future__ import print_function |
| |
| import math |
| |
| import numpy as np |
| |
| from tensorflow.compiler.tests import xla_test |
| from tensorflow.python.framework import dtypes |
| from tensorflow.python.ops import array_ops |
| from tensorflow.python.ops import math_ops |
| from tensorflow.python.ops import random_ops |
| from tensorflow.python.ops.distributions import special_math |
| from tensorflow.python.platform import googletest |
| |
| |
| class RandomOpsTest(xla_test.XLATestCase): |
| """Test cases for random-number generating operators.""" |
| |
| def _random_types(self): |
| return set(self.numeric_types) - set(self.complex_types) |
| |
| def _testRngIsNotConstant(self, rng, dtype): |
| # Tests that 'rng' does not always return the same value. |
| with self.cached_session() as sess: |
| with self.test_scope(): |
| x = rng(dtype) |
| |
| # The random-number generator, if working correctly, should produce the |
| # same output multiple times with low probability. |
| y = sess.run(x) |
| z = sess.run(x) |
| w = sess.run(x) |
| |
| # We use exact equality here. If the random-number generator is producing |
| # deterministic output, all three outputs will be bitwise identical. |
| self.assertTrue((not np.array_equal(y, z)) or |
| (not np.array_equal(z, w)) or (not np.array_equal(y, w))) |
| |
| def testRandomUniformIsNotConstant(self): |
| |
| def rng(dtype): |
| dtype = dtypes.as_dtype(dtype) |
| return random_ops.random_uniform(shape=[2], dtype=dtype, maxval=dtype.max) |
| |
| for dtype in self._random_types(): |
| self._testRngIsNotConstant(rng, dtype) |
| |
| def testRandomNormalIsNotConstant(self): |
| |
| def rng(dtype): |
| return random_ops.random_normal(shape=[2], dtype=dtype) |
| |
| # TODO(b/34339814): implement inverse erf support for non-F32 types. |
| dtype = dtypes.float32 |
| self._testRngIsNotConstant(rng, dtype) |
| |
| def testRandomUniformIsInRange(self): |
| for dtype in self._random_types(): |
| # TODO (b/112272078): enable bfloat16 for CPU and GPU when the bug is |
| # fixed. |
| if (self.device in ["XLA_GPU", "XLA_CPU" |
| ]) and (dtype in [dtypes.bfloat16, dtypes.half]): |
| continue |
| with self.cached_session() as sess: |
| with self.test_scope(): |
| x = random_ops.random_uniform( |
| shape=[1000], dtype=dtype, minval=-2, maxval=33) |
| y = sess.run(x) |
| self.assertTrue((y >= -2).sum() == 1000) |
| self.assertTrue((y < 33).sum() == 1000) |
| |
| def testTruncatedNormalIsNotConstant(self): |
| |
| def rng(dtype): |
| return random_ops.truncated_normal(shape=[2], dtype=dtype) |
| |
| # TODO(b/34339814): implement inverse erf support for non-F32 types. |
| self._testRngIsNotConstant(rng, dtypes.float32) |
| |
| def testTruncatedNormalIsInRange(self): |
| count = 10000000 |
| # TODO(b/34339814): implement inverse erf support for non-F32 types. |
| for dtype in [dtypes.float32]: |
| with self.cached_session() as sess: |
| with self.test_scope(): |
| x = random_ops.truncated_normal(shape=[count], dtype=dtype) |
| y = sess.run(x) |
| |
| def normal_cdf(x): |
| return .5 * math.erfc(-x / math.sqrt(2)) |
| |
| def normal_pdf(x): |
| return math.exp(-(x**2) / 2.) / math.sqrt(2 * math.pi) |
| |
| def probit(x, sess=sess): |
| return sess.run(special_math.ndtri(x)) |
| |
| a = -2. |
| b = 2. |
| mu = 0. |
| sigma = 1. |
| |
| alpha = (a - mu) / sigma |
| beta = (b - mu) / sigma |
| z = normal_cdf(beta) - normal_cdf(alpha) |
| |
| self.assertTrue((y >= a).sum() == count) |
| self.assertTrue((y <= b).sum() == count) |
| |
| # For more information on these calculations, see: |
| # Burkardt, John. "The Truncated Normal Distribution". |
| # Department of Scientific Computing website. Florida State University. |
| expected_mean = mu + (normal_pdf(alpha) - normal_pdf(beta)) / z * sigma |
| actual_mean = np.mean(y) |
| self.assertAllClose(actual_mean, expected_mean, atol=2e-3) |
| |
| expected_median = mu + probit( |
| (normal_cdf(alpha) + normal_cdf(beta)) / 2.) * sigma |
| actual_median = np.median(y) |
| self.assertAllClose(actual_median, expected_median, atol=1e-2) |
| |
| expected_variance = sigma**2 * (1 + ( |
| (alpha * normal_pdf(alpha) - beta * normal_pdf(beta)) / z) - ( |
| (normal_pdf(alpha) - normal_pdf(beta)) / z)**2) |
| actual_variance = np.var(y) |
| self.assertAllClose(actual_variance, expected_variance, rtol=2*1e-3) |
| |
| def testShuffle1d(self): |
| # TODO(b/26783907): this test requires the CPU backend to implement sort. |
| if self.device in ["XLA_CPU"]: |
| return |
| with self.cached_session() as sess: |
| with self.test_scope(): |
| x = math_ops.range(1 << 16) |
| shuffle = random_ops.random_shuffle(x) |
| result = sess.run(shuffle) |
| expected = range(1 << 16) |
| # Compare sets to avoid randomness behavior changes but make sure still |
| # have all the values. |
| self.assertAllEqual(set(result), set(expected)) |
| |
| def testShuffle2d(self): |
| with self.cached_session() as sess: |
| with self.test_scope(): |
| x = array_ops.diag(math_ops.range(20)) |
| shuffle = random_ops.random_shuffle(x) |
| result = sess.run(shuffle) |
| expected = np.diag(range(20)).flatten() |
| # Compare sets to avoid randomness behavior changes but make sure still |
| # have all the values. |
| self.assertAllEqual(len(result.flatten()), len(expected)) |
| self.assertAllEqual(set(result.flatten()), set(expected)) |
| |
| |
| if __name__ == '__main__': |
| googletest.main() |