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101 lines
2.5 KiB
101 lines
2.5 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#include <cstdint>
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#include <memory>
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#include <random>
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namespace paddle {
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namespace operators {
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namespace math {
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// TODO(wanghaoshuang): Support for GPU
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/**
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* Sample integers from [0, range).
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*/
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class Sampler {
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public:
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explicit Sampler(int64_t range) : range_(range) {
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PADDLE_ENFORCE_GT(range, 0);
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std::random_device r;
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seed_ = r();
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}
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explicit Sampler(int64_t range, unsigned int seed)
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: range_(range), seed_(seed) {
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PADDLE_ENFORCE_GT(range, 0);
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}
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virtual ~Sampler();
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// Sample a single value
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virtual int64_t Sample() const = 0;
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// The probability that a single call to Sample() returns the given value.
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virtual float Probability(int64_t value) const = 0;
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int64 range() { return range_; }
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protected:
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const int64_t range_;
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unsigned int seed_;
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};
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/**
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* Sample integers from [0, range).
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* And the distribution function is:
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* P(x) = 1 / range
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*/
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class UniformSampler : public Sampler {
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public:
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explicit UniformSampler(int64_t range);
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explicit UniformSampler(int64_t range, unsigned int seed);
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~UniformSampler() override {}
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int64 Sample() const override;
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float Probability(int64_t value) const override;
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private:
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const float inv_range_;
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std::shared_ptr<std::mt19937_64> random_engine_;
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std::shared_ptr<std::uniform_int_distribution<>> dist_;
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};
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/**
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* Sample integers from [0, range).
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* And the distribution function is:
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* P(x) = (1/ln(range+1)) * ln(1 + 1/(x + 1))
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*/
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class LogUniformSampler : public Sampler {
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public:
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explicit LogUniformSampler(int64_t range);
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explicit LogUniformSampler(int64_t range, unsigned int seed);
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~LogUniformSampler() override {}
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int64 Sample() const override;
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float Probability(int64_t value) const override;
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private:
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const float log_range_;
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std::shared_ptr<std::mt19937_64> random_engine_;
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std::shared_ptr<std::uniform_real_distribution<>> dist_;
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};
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} // namespace math
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} // namespace operators
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} // namespace paddle
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