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Long Text Generation via Adversarial Training
with Leaked Information
Jiaxian Guo, Sidi Lu, Han Cai, Weinan Zhang, Yong Yu, Jun Wang
AAAI 2018, pp.5141-5148
https://arxiv.org/pdf/1709.08624.pdf
๊ตญ๋ฏผ๋Œ€ํ•™๊ต ์ž์—ฐ์–ด์ฒ˜๋ฆฌ์—ฐ๊ตฌ์‹ค ๋‚จ๊ทœํ˜„
Natural Language Processing Lab. @Kookmin University
Natural Language Processing Lab. @Kookmin University
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โ€ข ํ…์ŠคํŠธ ์ƒ์„ฑ ์‚ฌ์šฉ ๋ถ„์•ผ
- ๊ธฐ๊ณ„ ๋ฒˆ์—ญ, ๋Œ€ํ™” ์‹œ์Šคํ…œ, ์ด๋ฏธ์ง€ ์บก์…˜
โ€ข GAN
- ์ƒ์„ฑ์ž, ํŒ๋ณ„์ž ๊ฐœ๋…์„ ๋„์ž…ํ•จ์œผ๋กœ์„œ ๋น„์ง€๋„ ํ•™์Šต์œผ๋กœ ๋ฌธ์žฅ์„ ์ƒ์„ฑ ๊ฐ€๋Šฅ
- ๋ฌธ์žฅ์ด ๊ธธ์–ด์งˆ ์ˆ˜๋ก ์ƒ์„ฑ๋œ ๋ฌธ์žฅ์˜ ํ’ˆ์งˆ์ด ์•ˆ ์ข‹์•„์ง.
โ€ข LeakGAN
- ํŒ๋ณ„์ž : ๋†’์€ ๋‹จ๊ณ„์˜ featur๋“ค์„ ์ƒ์„ฑ์ž์—๊ฒŒ ์œ ์ถœ(Leak)
- ์ƒ์„ฑ์ž : Manager, Worker ๋กœ ๊ตฌ์„ฑ
- Manager : ํ˜„์žฌ ์ƒ์„ฑํ•œ ๋‹จ์–ด๋กœ latent vector ๋ฅผ ์ถ”์ถœ, worker์—๊ฒŒ ์ „๋‹ฌ
- Worker : latent vector๋กœ ๋‹ค์Œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธก
Natural Language Processing Lab. @Kookmin University
์ฝ์–ด๋ด์•ผ ํ•  ๋…ผ๋ฌธ
โ€ข SeqGAN: Sequence Generative Adversarial Nets with Policy Gradient
โ€ข FeUdal Networks for Hierarchical Reinforcement Learning
Natural Language Processing Lab. @Kookmin University
โ€ข RNN
- ํ†ต๊ณ„์  ๋ฐฉ์‹์œผ๋กœ N-gram์„ ์ด์šฉํ•ด ๋‹จ์–ด๋ฅผ ์ƒ์„ฑํ•˜๋“ฏ์ด
RNN์—์„œ ์ด์ „ ๋‹จ์–ด๋ฅผ ์ด์šฉํ•ด ๋‹ค์Œ ๋‹จ์–ด ์˜ˆ์ธก
RNN
https://arxiv.org/pdf/1308.0850.pdf
T-1 ์‹œ์ ์—์„œ ์ƒ์„ฑํ•œ ๋‹จ์–ด๋Š”
T ์‹œ์ ์—์„œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธกํ•  ๋•Œ ์‚ฌ์šฉ๋œ๋‹ค.
Natural Language Processing Lab. @Kookmin University
โ€ข SeqGAN
- ๊ธฐ์กด์˜ GAN์€ ํ…์ŠคํŠธ ๊ฐ™์€ discrete data๋ฅผ ์ƒ์„ฑํ•˜๊ธฐ ์–ด๋ ค์›€
- ํŒ๋ณ„์ž์—์„œ ์ƒ์„ฑ์ž๋กœ gradient๋ฅผ ์ „๋‹ฌํ•˜๋Š”๋ฐ
๊ฐœ๋ณ„์ ์ธ ์ถœ๋ ฅ๋•Œ๋ฌธ์— ์–ด๋ ค์›€
- ๋ถ€๋ถ„์ ์œผ๋กœ ์ƒ์„ฑ๋œ ๋ฐ์ดํ„ฐ์˜ ๊ฒฝ์šฐ ์ ์ˆ˜๋ฅผ ๋‚ด๊ธฐ ์–ด๋ ค์›€
- ์ƒ์„ฑ์ž๋ฅผ ๊ฐ•ํ™”ํ•™์Šต์˜ ํ™•๋ฅ  ์ •์ฑ…(stochastic policy)๋กœ ๋ชจ๋ธ๋ง
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
Natural Language Processing Lab. @Kookmin University
โ€ข SeqGAN
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
- ๊ธฐ์กด์˜ GAN๊ณผ ๋งˆ์ฐฌ๊ฐ€์ง€๋กœ ์ƒ์„ฑ์ž๋Š” ๋ฌธ์žฅ์„ ์ƒ์„ฑ, ํŒ๋ณ„์ž๋Š” ์‹ค์ œ ๋ฌธ์žฅ๊ณผ ์ƒ์„ฑ ๋ฌธ์žฅ์„ ํŒ๋ณ„
- ๋‹จ, ํ•™์Šต ์ ˆ์ฐจ๋ฅผ ๊ฐ•ํ™” ํ•™์Šต(Reinforcement)์„ ์ด์šฉํ•จ.
Natural Language Processing Lab. @Kookmin University
โ€ข Generator
SeqGAN
- ์ƒ์„ฑ์ž๋Š” GRU cell๊ณผ attention ์„ ์ ์šฉํ•˜์—ฌ ๋ฌธ์žฅ์„ ์ƒ์„ฑํ•จ
T 1 2 3 4 5
Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค
โ€ข Generator update
- ๋ชจ๋ธ ํŒŒ๋ผ๋ฏธํ„ฐ theta ์— ๋Œ€ํ•œ ๋ณด์ƒ ํ•จ์ˆ˜ J
- ์‹œ์  T์—์„œ state : s ์™€ action : a ์˜ ์ƒ์„ฑ ํ™•๋ฅ  G์™€ ๋ชฉ์  ํ•จ์ˆ˜ Q ๊ณฑ์˜ ํ•ฉ
์ง‘์— โ€ฆ
๋„์„œ๊ด€์— โ€ฆ
Natural Language Processing Lab. @Kookmin University
โ€ข Generator update
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
- State-action value function : Q
T 1 2 3 4 5
Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค
State Action
๐‘Œ1:๐‘‡
1
๐‘Œ1:๐‘‡
2
๐‘Œ1:๐‘‡
๐‘›
Natural Language Processing Lab. @Kookmin University
โ€ข Generator update
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
- Derivate J
- Gradient update
Natural Language Processing Lab. @Kookmin University
โ€ข Discriminator
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
- CNN ์„ ์ด์šฉํ•˜์—ฌ ํŒ๋ณ„
> Concat
> Convolution
> Polling
โ€ข Discriminator Update
- ์‹ค์ œ ๋ฐ์ดํ„ฐ ๋ถ„ํฌ P data, ์˜ˆ์ธก ๋ฐ์ดํ„ฐ ๋ถ„ํฌ G theta
Natural Language Processing Lab. @Kookmin University
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
Natural Language Processing Lab. @Kookmin University
SeqGAN
http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
T 1 2 3 4 5
Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค
โ€ข Generator update
- State-action value function : Q
Natural Language Processing Lab. @Kookmin University
โ€ข ๊ธฐ์กด ์—ฐ๊ตฌ์—์„œ ๋ฌธ์ œ์ 
- ๋ฌธ์žฅ์ด ์™„์„ฑ๋˜์–ด์•ผ ์‹ ํ˜ธ๋ฅผ ์ค„ ์ˆ˜ ์žˆ๋Š” D ๋•Œ๋ฌธ์—, ๋ฌธ์žฅ์ด ๊ธธ์–ด์งˆ ๊ฒฝ์šฐ D์˜ ์‹ ํ˜ธ(signal)์ด ํฌ๋ฐ•ํ•ด์ง.
- ๋ฏธ๋ฆฌ ์ •์˜๋œ ๋„๋ฉ”์ธ์—์„œ ๋ฌธ์žฅ์„ ์ƒ์„ฑํ•˜๋Š” ์‹œ๋„๋Š” ์žˆ์—ˆ์Œ.
LeakGAN
https://arxiv.org/abs/1709.08624
โ€ข Idea
- ์ „์ฒด๋ฅผ ์ƒ์„ฑํ•˜๋Š” ๋ฌธ์ œ์—์„œ ์—ฌ๋Ÿฌ ๋ถ€๋ถ„์„ ์ƒ์„ฑํ•˜๋Š” ๋ฌธ์ œ๋กœ ๋ณ€๊ฒฝํ•˜์ž. (Hierarchical task)
- ์ •ํ•ด์ง„ ๋„๋ฉ”์ธ์˜ ๋ฐ์ดํ„ฐ ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ๋‹ค๋ฅธ ๋ฐ์ดํ„ฐ๋„ ์ƒ์„ฑํ•˜์ž.
Natural Language Processing Lab. @Kookmin University
LeakGAN
https://arxiv.org/abs/1709.08624
Natural Language Processing Lab. @Kookmin University
โ€ข Leaked feature from D as Guiding signals
- s : input, Pi : model parameter, F : CNN, f : feature vector (leaked information)
LeakGAN
https://arxiv.org/abs/1709.08624
โ€ข Hierarchical Structure of G
- D์˜ ์œ ์ถœ๋œ ์ •๋ณด๋ฅผ ์ด์šฉํ•˜๊ธฐ ์œ„ํ•ด Manager-Worker ๊ณ„์ธต ๊ตฌ์กฐ ํ˜•ํƒœ๋ฅผ ๊ฐ€์ง
- Manager : ๊ฐ ์‹œ์  t ์—์„œ ์œ ์ถœ ์ •๋ณด ft ๋ฅผ ์ด์šฉํ•ด goal vector : gt ๋ฅผ ์ƒ์„ฑ
- Worker : manager์˜ gt๋ฅผ ํ† ๋Œ€๋กœ ๋‹ค์Œ ๋‹จ์–ด ์ƒ์„ฑ
Natural Language Processing Lab. @Kookmin University
โ€ข Generation process (Manager)
- Manager ์€ ์œ ์ถœ ์ •๋ณด๋กœ goal vector (worker๋“ค์˜ guideline) ์„ ์ƒ์„ฑํ•ด์•ผ ํ•จ.
- hM : hidden state, theta : model parameter, M : LSTM
LeakGAN
https://arxiv.org/abs/1709.08624
- ์ด์ „ ์‹œ์ ์˜ goal vector ์™€ ํ˜„์žฌ ๋ฒกํ„ฐ๋ฅผ embedding.
- Phsai : model parameter
Natural Language Processing Lab. @Kookmin University
โ€ข Generation process (Worker)
- Worker ๋Š” Manager์˜ goal vector ์™€ ํ˜„์žฌ ๋‹จ์–ด๋กœ ๋‹ค์Œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธกํ•ด์•ผ ํ•จ.
- Xt : ํ˜„์žฌ ๋‹จ์–ด, h : hidden state, theta : model parameter, W : LSTM, a : temp parameter
LeakGAN
https://arxiv.org/abs/1709.08624
Natural Language Processing Lab. @Kookmin University
โ€ข Training of G
- G์˜ ๋ชจ๋“  ๊ณผ์ •์€ ๋ฏธ๋ถ„ ๊ฐ€๋Šฅํ•œ ๊ตฌ์กฐ๋กœ ๋˜์—ˆ์œผ๋ฏ€๋กœ, gradient policy๋ฅผ ๋”ฐ๋ผ์„œ ์•„๋ž˜์™€ ๊ฐ™์ด
Manager ์˜ gradient ๋ฅผ ๊ณ„์‚ฐ.
LeakGAN
https://arxiv.org/abs/1709.08624
- Q : state value function,
ํ˜„์žฌ ์ƒํƒœ st, goal vector : gt ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ monte carlo ์„ ๊ฑฐ์ณ reward๋ฅผ ์ธก์ •.
- Dcos : ๋‘ ๋ฒกํ„ฐ์˜ ์ฝ”์‚ฌ์ธ ์œ ์‚ฌ๋„
- Ft+c : c step ์ดํ›„ ์œ ์ถœ๋œ ์ •๋ณด
- Gt : goal vector by param theta
Natural Language Processing Lab. @Kookmin University
โ€ข Training of G
- Worker์˜ reward gradient
LeakGAN
https://arxiv.org/abs/1709.08624
- Rt : ๋ณธ์งˆ์ ์ธ reward
Natural Language Processing Lab. @Kookmin University
โ€ข NLL & BLEU
LeakGAN
https://arxiv.org/abs/1709.08624
โ€ข BLEU score
- Machine translation ์—์„œ ์‹ค์ œ ๋ฌธ์žฅ๊ณผ ๋ฒˆ์—ญํ•œ ๋ฌธ์žฅ์„
์„ฑ๋Šฅ ๋น„๊ตํ•  ๋•Œ ์‚ฌ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•
- Ngram ๋‹น precision์„ ์ธก์ •ํ•˜์—ฌ ์ ์ˆ˜๋ฅผ ๋งค๊น€
Natural Language Processing Lab. @Kookmin University
โ€ข Turing test
LeakGAN
https://arxiv.org/abs/1709.08624

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[study] Long Text Generation via Adversarial Training with Leaked Information

  • 1. Long Text Generation via Adversarial Training with Leaked Information Jiaxian Guo, Sidi Lu, Han Cai, Weinan Zhang, Yong Yu, Jun Wang AAAI 2018, pp.5141-5148 https://arxiv.org/pdf/1709.08624.pdf ๊ตญ๋ฏผ๋Œ€ํ•™๊ต ์ž์—ฐ์–ด์ฒ˜๋ฆฌ์—ฐ๊ตฌ์‹ค ๋‚จ๊ทœํ˜„ Natural Language Processing Lab. @Kookmin University
  • 2. Natural Language Processing Lab. @Kookmin University Preview โ€ข ํ…์ŠคํŠธ ์ƒ์„ฑ ์‚ฌ์šฉ ๋ถ„์•ผ - ๊ธฐ๊ณ„ ๋ฒˆ์—ญ, ๋Œ€ํ™” ์‹œ์Šคํ…œ, ์ด๋ฏธ์ง€ ์บก์…˜ โ€ข GAN - ์ƒ์„ฑ์ž, ํŒ๋ณ„์ž ๊ฐœ๋…์„ ๋„์ž…ํ•จ์œผ๋กœ์„œ ๋น„์ง€๋„ ํ•™์Šต์œผ๋กœ ๋ฌธ์žฅ์„ ์ƒ์„ฑ ๊ฐ€๋Šฅ - ๋ฌธ์žฅ์ด ๊ธธ์–ด์งˆ ์ˆ˜๋ก ์ƒ์„ฑ๋œ ๋ฌธ์žฅ์˜ ํ’ˆ์งˆ์ด ์•ˆ ์ข‹์•„์ง. โ€ข LeakGAN - ํŒ๋ณ„์ž : ๋†’์€ ๋‹จ๊ณ„์˜ featur๋“ค์„ ์ƒ์„ฑ์ž์—๊ฒŒ ์œ ์ถœ(Leak) - ์ƒ์„ฑ์ž : Manager, Worker ๋กœ ๊ตฌ์„ฑ - Manager : ํ˜„์žฌ ์ƒ์„ฑํ•œ ๋‹จ์–ด๋กœ latent vector ๋ฅผ ์ถ”์ถœ, worker์—๊ฒŒ ์ „๋‹ฌ - Worker : latent vector๋กœ ๋‹ค์Œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธก
  • 3. Natural Language Processing Lab. @Kookmin University ์ฝ์–ด๋ด์•ผ ํ•  ๋…ผ๋ฌธ โ€ข SeqGAN: Sequence Generative Adversarial Nets with Policy Gradient โ€ข FeUdal Networks for Hierarchical Reinforcement Learning
  • 4. Natural Language Processing Lab. @Kookmin University โ€ข RNN - ํ†ต๊ณ„์  ๋ฐฉ์‹์œผ๋กœ N-gram์„ ์ด์šฉํ•ด ๋‹จ์–ด๋ฅผ ์ƒ์„ฑํ•˜๋“ฏ์ด RNN์—์„œ ์ด์ „ ๋‹จ์–ด๋ฅผ ์ด์šฉํ•ด ๋‹ค์Œ ๋‹จ์–ด ์˜ˆ์ธก RNN https://arxiv.org/pdf/1308.0850.pdf T-1 ์‹œ์ ์—์„œ ์ƒ์„ฑํ•œ ๋‹จ์–ด๋Š” T ์‹œ์ ์—์„œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธกํ•  ๋•Œ ์‚ฌ์šฉ๋œ๋‹ค.
  • 5. Natural Language Processing Lab. @Kookmin University โ€ข SeqGAN - ๊ธฐ์กด์˜ GAN์€ ํ…์ŠคํŠธ ๊ฐ™์€ discrete data๋ฅผ ์ƒ์„ฑํ•˜๊ธฐ ์–ด๋ ค์›€ - ํŒ๋ณ„์ž์—์„œ ์ƒ์„ฑ์ž๋กœ gradient๋ฅผ ์ „๋‹ฌํ•˜๋Š”๋ฐ ๊ฐœ๋ณ„์ ์ธ ์ถœ๋ ฅ๋•Œ๋ฌธ์— ์–ด๋ ค์›€ - ๋ถ€๋ถ„์ ์œผ๋กœ ์ƒ์„ฑ๋œ ๋ฐ์ดํ„ฐ์˜ ๊ฒฝ์šฐ ์ ์ˆ˜๋ฅผ ๋‚ด๊ธฐ ์–ด๋ ค์›€ - ์ƒ์„ฑ์ž๋ฅผ ๊ฐ•ํ™”ํ•™์Šต์˜ ํ™•๋ฅ  ์ •์ฑ…(stochastic policy)๋กœ ๋ชจ๋ธ๋ง SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
  • 6. Natural Language Processing Lab. @Kookmin University โ€ข SeqGAN SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf - ๊ธฐ์กด์˜ GAN๊ณผ ๋งˆ์ฐฌ๊ฐ€์ง€๋กœ ์ƒ์„ฑ์ž๋Š” ๋ฌธ์žฅ์„ ์ƒ์„ฑ, ํŒ๋ณ„์ž๋Š” ์‹ค์ œ ๋ฌธ์žฅ๊ณผ ์ƒ์„ฑ ๋ฌธ์žฅ์„ ํŒ๋ณ„ - ๋‹จ, ํ•™์Šต ์ ˆ์ฐจ๋ฅผ ๊ฐ•ํ™” ํ•™์Šต(Reinforcement)์„ ์ด์šฉํ•จ.
  • 7. Natural Language Processing Lab. @Kookmin University โ€ข Generator SeqGAN - ์ƒ์„ฑ์ž๋Š” GRU cell๊ณผ attention ์„ ์ ์šฉํ•˜์—ฌ ๋ฌธ์žฅ์„ ์ƒ์„ฑํ•จ T 1 2 3 4 5 Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค โ€ข Generator update - ๋ชจ๋ธ ํŒŒ๋ผ๋ฏธํ„ฐ theta ์— ๋Œ€ํ•œ ๋ณด์ƒ ํ•จ์ˆ˜ J - ์‹œ์  T์—์„œ state : s ์™€ action : a ์˜ ์ƒ์„ฑ ํ™•๋ฅ  G์™€ ๋ชฉ์  ํ•จ์ˆ˜ Q ๊ณฑ์˜ ํ•ฉ
  • 8. ์ง‘์— โ€ฆ ๋„์„œ๊ด€์— โ€ฆ Natural Language Processing Lab. @Kookmin University โ€ข Generator update SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf - State-action value function : Q T 1 2 3 4 5 Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค State Action ๐‘Œ1:๐‘‡ 1 ๐‘Œ1:๐‘‡ 2 ๐‘Œ1:๐‘‡ ๐‘›
  • 9. Natural Language Processing Lab. @Kookmin University โ€ข Generator update SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf - Derivate J - Gradient update
  • 10. Natural Language Processing Lab. @Kookmin University โ€ข Discriminator SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf - CNN ์„ ์ด์šฉํ•˜์—ฌ ํŒ๋ณ„ > Concat > Convolution > Polling โ€ข Discriminator Update - ์‹ค์ œ ๋ฐ์ดํ„ฐ ๋ถ„ํฌ P data, ์˜ˆ์ธก ๋ฐ์ดํ„ฐ ๋ถ„ํฌ G theta
  • 11. Natural Language Processing Lab. @Kookmin University SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf
  • 12. Natural Language Processing Lab. @Kookmin University SeqGAN http://www.aaai.org/Conferences/AAAI/2017/PreliminaryPapers/12-Yu-L-14344.pdf T 1 2 3 4 5 Word ๋‚˜๋Š” ๋ฐฅ์„ ๋จน๊ณ  ํ•™๊ต์— ๊ฐ”๋‹ค โ€ข Generator update - State-action value function : Q
  • 13. Natural Language Processing Lab. @Kookmin University โ€ข ๊ธฐ์กด ์—ฐ๊ตฌ์—์„œ ๋ฌธ์ œ์  - ๋ฌธ์žฅ์ด ์™„์„ฑ๋˜์–ด์•ผ ์‹ ํ˜ธ๋ฅผ ์ค„ ์ˆ˜ ์žˆ๋Š” D ๋•Œ๋ฌธ์—, ๋ฌธ์žฅ์ด ๊ธธ์–ด์งˆ ๊ฒฝ์šฐ D์˜ ์‹ ํ˜ธ(signal)์ด ํฌ๋ฐ•ํ•ด์ง. - ๋ฏธ๋ฆฌ ์ •์˜๋œ ๋„๋ฉ”์ธ์—์„œ ๋ฌธ์žฅ์„ ์ƒ์„ฑํ•˜๋Š” ์‹œ๋„๋Š” ์žˆ์—ˆ์Œ. LeakGAN https://arxiv.org/abs/1709.08624 โ€ข Idea - ์ „์ฒด๋ฅผ ์ƒ์„ฑํ•˜๋Š” ๋ฌธ์ œ์—์„œ ์—ฌ๋Ÿฌ ๋ถ€๋ถ„์„ ์ƒ์„ฑํ•˜๋Š” ๋ฌธ์ œ๋กœ ๋ณ€๊ฒฝํ•˜์ž. (Hierarchical task) - ์ •ํ•ด์ง„ ๋„๋ฉ”์ธ์˜ ๋ฐ์ดํ„ฐ ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ๋‹ค๋ฅธ ๋ฐ์ดํ„ฐ๋„ ์ƒ์„ฑํ•˜์ž.
  • 14. Natural Language Processing Lab. @Kookmin University LeakGAN https://arxiv.org/abs/1709.08624
  • 15. Natural Language Processing Lab. @Kookmin University โ€ข Leaked feature from D as Guiding signals - s : input, Pi : model parameter, F : CNN, f : feature vector (leaked information) LeakGAN https://arxiv.org/abs/1709.08624 โ€ข Hierarchical Structure of G - D์˜ ์œ ์ถœ๋œ ์ •๋ณด๋ฅผ ์ด์šฉํ•˜๊ธฐ ์œ„ํ•ด Manager-Worker ๊ณ„์ธต ๊ตฌ์กฐ ํ˜•ํƒœ๋ฅผ ๊ฐ€์ง - Manager : ๊ฐ ์‹œ์  t ์—์„œ ์œ ์ถœ ์ •๋ณด ft ๋ฅผ ์ด์šฉํ•ด goal vector : gt ๋ฅผ ์ƒ์„ฑ - Worker : manager์˜ gt๋ฅผ ํ† ๋Œ€๋กœ ๋‹ค์Œ ๋‹จ์–ด ์ƒ์„ฑ
  • 16. Natural Language Processing Lab. @Kookmin University โ€ข Generation process (Manager) - Manager ์€ ์œ ์ถœ ์ •๋ณด๋กœ goal vector (worker๋“ค์˜ guideline) ์„ ์ƒ์„ฑํ•ด์•ผ ํ•จ. - hM : hidden state, theta : model parameter, M : LSTM LeakGAN https://arxiv.org/abs/1709.08624 - ์ด์ „ ์‹œ์ ์˜ goal vector ์™€ ํ˜„์žฌ ๋ฒกํ„ฐ๋ฅผ embedding. - Phsai : model parameter
  • 17. Natural Language Processing Lab. @Kookmin University โ€ข Generation process (Worker) - Worker ๋Š” Manager์˜ goal vector ์™€ ํ˜„์žฌ ๋‹จ์–ด๋กœ ๋‹ค์Œ ๋‹จ์–ด๋ฅผ ์˜ˆ์ธกํ•ด์•ผ ํ•จ. - Xt : ํ˜„์žฌ ๋‹จ์–ด, h : hidden state, theta : model parameter, W : LSTM, a : temp parameter LeakGAN https://arxiv.org/abs/1709.08624
  • 18. Natural Language Processing Lab. @Kookmin University โ€ข Training of G - G์˜ ๋ชจ๋“  ๊ณผ์ •์€ ๋ฏธ๋ถ„ ๊ฐ€๋Šฅํ•œ ๊ตฌ์กฐ๋กœ ๋˜์—ˆ์œผ๋ฏ€๋กœ, gradient policy๋ฅผ ๋”ฐ๋ผ์„œ ์•„๋ž˜์™€ ๊ฐ™์ด Manager ์˜ gradient ๋ฅผ ๊ณ„์‚ฐ. LeakGAN https://arxiv.org/abs/1709.08624 - Q : state value function, ํ˜„์žฌ ์ƒํƒœ st, goal vector : gt ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ monte carlo ์„ ๊ฑฐ์ณ reward๋ฅผ ์ธก์ •. - Dcos : ๋‘ ๋ฒกํ„ฐ์˜ ์ฝ”์‚ฌ์ธ ์œ ์‚ฌ๋„ - Ft+c : c step ์ดํ›„ ์œ ์ถœ๋œ ์ •๋ณด - Gt : goal vector by param theta
  • 19. Natural Language Processing Lab. @Kookmin University โ€ข Training of G - Worker์˜ reward gradient LeakGAN https://arxiv.org/abs/1709.08624 - Rt : ๋ณธ์งˆ์ ์ธ reward
  • 20. Natural Language Processing Lab. @Kookmin University โ€ข NLL & BLEU LeakGAN https://arxiv.org/abs/1709.08624 โ€ข BLEU score - Machine translation ์—์„œ ์‹ค์ œ ๋ฌธ์žฅ๊ณผ ๋ฒˆ์—ญํ•œ ๋ฌธ์žฅ์„ ์„ฑ๋Šฅ ๋น„๊ตํ•  ๋•Œ ์‚ฌ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ• - Ngram ๋‹น precision์„ ์ธก์ •ํ•˜์—ฌ ์ ์ˆ˜๋ฅผ ๋งค๊น€
  • 21. Natural Language Processing Lab. @Kookmin University โ€ข Turing test LeakGAN https://arxiv.org/abs/1709.08624