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deep-papers's Introduction

안수빈 (An Subin)

"He who has dreamed for long resembles his dream.”

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deep-papers's Issues

Attention Is All You Need

Concept

Structure

  • Multi-head self-attention
    • Scaled Dot-Product Attention
  • Residual connection
  • Layer nomalization
  • Masked
  • Positional Encoding

Optimizer

  • Adam (warm up steps = 4000)

Regularization

  • Residual Dropout
  • Label Smoothing

XLNet: Generalized Autoregressive Pretraining for Language Understanding

  • https://arxiv.org/pdf/1906.08237.pdf
  • XLNet
  • Transformer-XL의 확장이라고 함
    • 이 친구는 리젝되었지만 성능이 좋아 허깅페이스, 구글 블로그에 올라옴 (저자 같음. 리젝 후 XLNET으로 업그레이드)
    • PR12 박성남님 발표로 살펴보기
    • transformer 문제점
      • long-term dependency (고정 길이라 긴 길이 불가)
      • context fragmentations (이전 시퀀스에 대한 문맥 정보 전달 불가)
    • 해결책
      • Segment-level Recurrence (cache로 다음 시퀀스에게 정보 전달)
        • 메모리만 가능하다면 이전 시퀀스 정보 사용 가능
      • Relative Positional Embeddings
        • 연속적인 시퀀스 학습을 할 수 없기 때문에 기존 positional embedding 불가
    • autoregressive + receptive field로 이해하면 될 듯.
    • evaluation : PPL, BPC, RECL
    • limit : downstream task에서 안해봄, documentation generation 결과 없음, GPT2가 이김

스크린샷 2021-02-02 오후 11 47 26

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