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127 lines
4.1 KiB
127 lines
4.1 KiB
/* Copyright (c) 2018 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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#include <thrust/random.h>
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#include <thrust/transform.h>
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#include <limits>
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#include "paddle/fluid/framework/generator.h"
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#include "paddle/fluid/framework/op_registry.h"
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#include "paddle/fluid/framework/operator.h"
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namespace paddle {
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namespace operators {
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template <typename T>
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struct TruncatedNormal {
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T mean, std;
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T a_normal_cdf;
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T b_normal_cdf;
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unsigned int seed;
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T numeric_min;
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__host__ __device__ TruncatedNormal(T mean, T std, T numeric_min, int seed)
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: mean(mean), std(std), seed(seed), numeric_min(numeric_min) {
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a_normal_cdf = (1.0 + erff(-2.0 / sqrtf(2.0))) / 2.0;
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b_normal_cdf = (1.0 + erff(2.0 / sqrtf(2.0))) / 2.0;
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}
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__host__ __device__ T operator()(const unsigned int n) const {
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thrust::minstd_rand rng;
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rng.seed(seed);
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thrust::uniform_real_distribution<T> dist(numeric_min, 1);
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rng.discard(n);
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T value = dist(rng);
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auto p = a_normal_cdf + (b_normal_cdf - a_normal_cdf) * value;
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return std::sqrt(2.0) * erfinvf(2 * p - 1) * std + mean;
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}
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};
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template <typename T>
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struct TruncatedNormalOffset {
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T mean, std;
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T a_normal_cdf;
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T b_normal_cdf;
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unsigned int seed;
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T numeric_min;
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int offset_;
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__host__ __device__ TruncatedNormalOffset(T mean, T std, T numeric_min,
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int seed, int offset)
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: mean(mean),
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std(std),
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seed(seed),
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numeric_min(numeric_min),
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offset_(offset) {
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a_normal_cdf = (1.0 + erff(-2.0 / sqrtf(2.0))) / 2.0;
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b_normal_cdf = (1.0 + erff(2.0 / sqrtf(2.0))) / 2.0;
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}
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__host__ __device__ T operator()(const unsigned int n) const {
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thrust::minstd_rand rng;
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rng.seed(seed);
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thrust::uniform_real_distribution<T> dist(numeric_min, 1);
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rng.discard(n + offset_);
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T value = dist(rng);
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auto p = a_normal_cdf + (b_normal_cdf - a_normal_cdf) * value;
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return std::sqrt(2.0) * erfinvf(2 * p - 1) * std + mean;
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}
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};
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template <typename T>
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class GPUTruncatedGaussianRandomKernel : public framework::OpKernel<T> {
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public:
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void Compute(const framework::ExecutionContext& context) const override {
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auto* tensor = context.Output<framework::Tensor>("Out");
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T* data = tensor->mutable_data<T>(context.GetPlace());
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unsigned int seed = static_cast<unsigned int>(context.Attr<int>("seed"));
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bool seed_flag = false;
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if (seed == 0) {
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std::random_device rd;
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seed = rd();
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seed_flag = true;
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}
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T mean = static_cast<T>(context.Attr<float>("mean"));
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T std = static_cast<T>(context.Attr<float>("std"));
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thrust::counting_iterator<unsigned int> index_sequence_begin(0);
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int64_t size = tensor->numel();
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int device_id =
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BOOST_GET_CONST(platform::CUDAPlace, context.GetPlace()).GetDeviceId();
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auto gen_cuda = framework::GetDefaultCUDAGenerator(device_id);
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if (gen_cuda->GetIsInitPy() && seed_flag) {
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auto seed_offset = gen_cuda->IncrementOffset(1);
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int gen_offset = size * seed_offset.second;
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thrust::transform(
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index_sequence_begin, index_sequence_begin + size,
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thrust::device_ptr<T>(data),
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TruncatedNormalOffset<T>(mean, std, std::numeric_limits<T>::min(),
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seed_offset.first, gen_offset));
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} else {
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thrust::transform(
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index_sequence_begin, index_sequence_begin + size,
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thrust::device_ptr<T>(data),
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TruncatedNormal<T>(mean, std, std::numeric_limits<T>::min(), seed));
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}
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}
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};
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} // namespace operators
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} // namespace paddle
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REGISTER_OP_CUDA_KERNEL(
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truncated_gaussian_random,
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paddle::operators::GPUTruncatedGaussianRandomKernel<float>);
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