1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #include "tensorflow/core/lib/random/simple_philox.h" 17 #include "tensorflow/core/lib/random/exact_uniform_int.h" 18 #include "tensorflow/core/platform/logging.h" 19 20 namespace tensorflow { 21 namespace random { 22 Uniform(uint32 n)23uint32 SimplePhilox::Uniform(uint32 n) { 24 return ExactUniformInt<uint32>(n, [this]() { return Rand32(); }); 25 } 26 Uniform64(uint64 n)27uint64 SimplePhilox::Uniform64(uint64 n) { 28 return ExactUniformInt<uint64>(n, [this]() { return Rand64(); }); 29 } 30 Skewed(int max_log)31uint32 SimplePhilox::Skewed(int max_log) { 32 CHECK(0 <= max_log && max_log <= 32); 33 const int shift = Rand32() % (max_log + 1); 34 const uint32 mask = shift == 32 ? ~static_cast<uint32>(0) : (1 << shift) - 1; 35 return Rand32() & mask; 36 } 37 38 } // namespace random 39 } // namespace tensorflow 40