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[DL輪読会]“SimGANs: Simulator-Based Generative Adversarial Networks for ECG Synthesis to Improve Deep ECG Classification (ICML2020)”
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2020/08/028 Deep Learning JP: http://deeplearning.jp/seminar-2/
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[DL輪読会]“SimGANs: Simulator-Based Generative Adversarial Networks for ECG Synthesis to Improve Deep ECG Classification (ICML2020)”
1.
1 DEEP LEARNING JP [DL
Papers] http://deeplearning.jp/ “SimGANs: Simulator-Based Generative Adversarial Networks for ECG Synthesis to Improve Deep ECG Classification (ICML2020)” Naoki Nonaka 2020/8/28
2.
2020/8/28 2 目次 • 書誌情報 •
背景 • 提案手法 • 実験 • まとめ
3.
2020/8/28 3 書誌情報 • 会議:ICML
2020 • 著者:Tomer Golany, et al. (Israel Institute of Technology) • 実装:https://github.com/tomerGolany/sim_gan
4.
2020/8/28 4 概要 GANによる心電図の生成に取り組んだ研究 心電図のシミュレータを用いて,生成対象に関する情報を 与えることで生成の質を向上するSimGANを提案 提案手法による生成データを用いることで, 心電図の分類精度を向上できることを示した
5.
2020/8/28 5 背景 (生成モデルにより)生成したデータで分類精度を向上したい
心電図では,データの生成過程に関する知識に基づくシミュレータが存在 常微分方程式(ODE)によるシミュレータを活用した生成モデル
6.
2020/8/28 6 心電図とは 基本的な心臓の検査の一つ 不整脈や心筋梗塞,狭心症を調べる上で重要 心臓の電気的活動を電極で検出して記録 https://physionet.org/content/challenge-2017/1.0.0/ 収集されるデータの例
7.
2020/8/28 7 提案手法: SimGAN Discriminator: Generator: 通常のGANで用いられるLoss
シミュレータとの一致を評価するLoss GANのGeneratorに,シミュレータとの一致を評価する損失を追加
8.
2020/8/28 8 提案手法: SimGAN :
ℎ𝑖は時刻𝑖における値,ℎは固定長𝐿の心電図 : 𝑙 ~ 𝑙 + 1 までの(生成された)心電図の変化の割合 : シミュレータによる心電図の変化の割合
9.
2020/8/28 9 心電図のシミュレータ 以下のODEで表現される(𝑥 𝑡
, 𝑦 𝑡 , 𝑧 𝑡 )の3つの軌跡で心電図を再現 (McSharry et al.; 2003 ) 3次元の軌跡として表現される 心電図の波形として用いられるのはzのみ
10.
2020/8/28 10 提案手法: SimGAN Generatorの構造とGeneratorのLoss
11.
2020/8/28 11 実験 生成データによる分類精度の変化検証
Generatorへの入力の比較 シミュレータの出力を直接用いる場合との比較 生成データの定性的評価
12.
2020/8/28 12 データ MIT-BIH arrhythmia
database 30minの心電図 x 48 (360Hzで収集) 109,492心拍 クラスラベル Ventricular Ectopic Beat (VEB) | 心室性期外収縮 Supraventricular Ectopic Beat (SVEB) | 上室性期外収縮 Fusion Beat | 融合心拍 Normal Beat
13.
2020/8/28 13 比較モデル: 実験1
(生成データによる分類精度の変化検証) G VGAN / DCGAN SimVGAN / SimDCGAN G Al Rahhal et al. [ 追加データなし ]
14.
2020/8/28 14 生成データによる分類精度の変化検証 𝐿 𝐺 𝐸𝑈𝐿 (𝜙
𝐺) を導入して生成したECGを用いた場合に精度が向上
15.
2020/8/28 15 比較モデル: 実験2
(Generatorへの入力比較) Refine GAN G SimVGAN / SimDCGAN G (Simulator出力)
16.
2020/8/28 16 Generatorへの入力の比較 シミュレータの出力をRefinesした場合よりも精度が向上
17.
2020/8/28 17 比較モデル: 実験3
(シミュレータの出力を直接用いる場合との比較) ECG simulator SimVGAN / SimDCGAN G (Simulator出力) [ - ] [ - ] [ - ]
18.
2020/8/28 18 シミュレータの出力を直接用いる場合との比較 シミュレータの出力を直接用いる場合よりも精度が向上
19.
2020/8/28 19 生成されたECGの定性的評価 通常のGANよりも生成データの質が高い
20.
2020/8/28 20 まとめ シミュレータに関する知識を組み込んだSimGANを提案
提案手法により生成した心電図を用いることで, 分類問題の精度が向上することを示した 提案手法により生成された心電図が既存手法と比較して, 実際の心電図に近いことを定性的に確認した
21.
2020/8/28 21 比較モデル G VGAN /
DCGAN Refine GAN G SimVGAN / SimDCGAN G (Simulator出力)
Hinweis der Redaktion
https://www.kango-roo.com/ki/image_673/
GANはクラスごとに作成 シミュレータの出力は、Normal Classのみ
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