65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "LearningOptimizer.h"
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#define UE_API LEARNING_API
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namespace UE::Learning
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{
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/**
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* Settings for the PSO Optimizer. Defaults from https://www.jstage.jst.go.jp/article/imt/3/1/3_1_103/_pdf/-char/ja
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*/
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struct FPSOOptimizerSettings
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{
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// Amount to pull particles toward their local best
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float LocalGain = 1.49455f;
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// Amount to pull particles toward the global best
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float GlobalGain = 1.49455f;
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// How much of the particle velocity to preserve between steps
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float Momentum = 0.729f;
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};
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/**
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* PSO Optimizer
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*
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* Gradient free optimizer based on Particle Swarm Optimization
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*/
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struct FPSOOptimizer : public IOptimizer
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{
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UE_API FPSOOptimizer(const uint32 Seed, const FPSOOptimizerSettings& InSettings = FPSOOptimizerSettings());
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UE_API virtual void Resize(const int32 SampleNum, const int32 DimensionsNum) override final;
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UE_API virtual void Reset(
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TLearningArrayView<2, float> OutSamples,
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const TLearningArrayView<1, const float> InitialGuess) override final;
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UE_API virtual void Update(
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TLearningArrayView<2, float> InOutSamples,
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const TLearningArrayView<1, const float> Losses,
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const ELogSetting LogSettings = ELogSetting::Normal) override final;
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private:
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uint32 Seed = 0;
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FPSOOptimizerSettings Settings;
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int32 Iterations = 0;
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TLearningArray<2, float> LocalBestPositions;
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TLearningArray<1, float> LocalBestLoss;
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TLearningArray<1, float> GlobalBestPosition;
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float GlobalBestLoss = 0.0f;
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TLearningArray<2, float> Velocities;
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TLearningArray<2, float> LocalUniformSamples;
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TLearningArray<2, float> GlobalUniformSamples;
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};
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}
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#undef UE_API
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