wehub-resource-sync
86 lines
2.8 KiB
Plaintext
86 lines
2.8 KiB
Plaintext
/*
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* Copyright (c) 2019-2022, NVIDIA CORPORATION.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*/
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#pragma once
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#include <cstdint>
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#ifdef __NVCC__
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#include <cuda_runtime_api.h> // NOLINT
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#endif
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class RandomNumGen {
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public:
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__host__ __device__ __forceinline__ RandomNumGen(int gid, uint64_t seed) {
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next_random = seed + gid;
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next_random ^= next_random >> 33U;
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next_random *= 0xff51afd7ed558ccdUL;
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next_random ^= next_random >> 33U;
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next_random *= 0xc4ceb9fe1a85ec53UL;
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next_random ^= next_random >> 33U;
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}
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__host__ __device__ __forceinline__ ~RandomNumGen() = default;
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__host__ __device__ __forceinline__ void SetSeed(int seed) {
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next_random = seed;
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NextValue();
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}
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__host__ __device__ __forceinline__ uint64_t SaveState() const {
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return next_random;
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}
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__host__ __device__ __forceinline__ void LoadState(uint64_t state) {
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next_random = state;
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}
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__host__ __device__ __forceinline__ int Random() {
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int ret_value = static_cast<int>(next_random & 0x7fffffffULL);
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NextValue();
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return ret_value;
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}
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__host__ __device__ __forceinline__ int RandomMod(int mod) {
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return Random() % mod;
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}
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__host__ __device__ __forceinline__ int64_t Random64() {
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int64_t ret_value = (next_random & 0x7FFFFFFFFFFFFFFFLL);
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NextValue();
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return ret_value;
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}
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__host__ __device__ __forceinline__ int64_t RandomMod64(int64_t mod) {
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return Random64() % mod;
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}
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__host__ __device__ __forceinline__ float RandomUniformFloat(
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float max = 1.0f, float min = 0.0f) {
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int value = static_cast<int>(next_random & 0xffffff);
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auto ret_value = static_cast<float>(value);
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ret_value /= 0xffffffL;
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ret_value *= (max - min);
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ret_value += min;
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NextValue();
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return ret_value;
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}
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__host__ __device__ __forceinline__ bool RandomBool(float true_prob) {
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float value = RandomUniformFloat();
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return value <= true_prob;
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}
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__host__ __device__ __forceinline__ void NextValue() {
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// next_random = next_random * (unsigned long long)0xc4ceb9fe1a85ec53UL +
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// generator_id;
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// next_random = next_random * (unsigned long long)25214903917ULL + 11;
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next_random = next_random * static_cast<uint64_t>(13173779397737131ULL) +
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1023456798976543201ULL;
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}
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private:
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uint64_t next_random = 1;
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};
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