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DEEP LEARNING JP
[DL Papers]
“WIRE: Wavelet Implicit Neural Representations”
Presenter: Takahiro Maeda D2
(Toyota Technological Institute)
http://deeplearning.jp/
目次
1. 書誌情報
2. 概要
3. 研究背景
4. 提案手法
5. 実験結果
6. 考察・所感
2
1. 書誌情報
紹介論文
タイトル: WIRE: Wavelet Implicit Neural Representations
出典: ArXiv (2023. 1)
著者: Vishwanath Saragadam et. al.
所属: Rice University
選書理由
NeRFなどのImplicit Neural Representation (INR) と,
活性化関数との相性について初見だったため
※引用は最後にまとめてあります.特に明示が無い場合は紹介論文から引用
3
2. 概要
4
WIRE
• NeRFなどの画像用INRの活性化関数にWaveletを提案
• Waveletが画像表現に適しているため,正しい帰納バイアスを
獲得
• ノイズ除去,SR,任意視点生成などで精度向上
3. 研究背景
5
• Implicit Neural Representations (INR)
近年,INRの性能は, 活性化関数に大きく左右されるらしいと
判明
[1]
• Grid-based 手法
• INR (NeRF)
𝜃
(座標)
MLP
重み保持
グリッドデータ保持
• 保持すべきメモリが大き
い
• 解像度が限定される
• コンパクトな重みのみを
保持
• 任意解像度で生成可
[2]
3. 研究背景
6
• 活性化関数とINRの性能
– ReLU (default NeRF) 処理重,精度悪,ノイズ耐性悪
– Sine波 (SIREN[3]),Gaussian[4] 処理軽,精度良,ノイズ耐性悪
• 直線で自然信号を近似するため,より層を重ねる必要
• 細部の再現には,positional encodingなどの追加の工夫必要
• 周期的な信号に強
い
• 局所的な信号に強い
• 曲線を持つため,少ない層数で自然信号を近似
可
• 表現力が高いため,ノイズ信号も近似してしま
う
3. 研究背景
7
• 連続Wavelet変換
– 局所的な波の集合によって,信号を時間-周波数空間へ変換
– 非定常な信号(現実におけるほぼすべての信号)の解析によく用いられる
– JPEGの上位互換であるJPEG2000でも用いられる
[5]
Wavelet
4. 提案手法
8
• WIRE: Wavelet Implicit Neural Representations
– INRの活性化関数に Waveletを提案
– 局所的,周期的信号どちらにも対応可
– JPEG2000のようにWaveletが画像表現に適しているため,
正しい帰納バイアスを獲得できノイズへの頑健性向上
(これ以上の説明は無,デノイズでの精度向上で証明)
– ネットワーク内部では,Waveletを複素数のまま処理する
処理軽,精度良,ノイズ耐性良
5. 実験結果
9
• パラメータ選択
sine波,Gaussian単体よりも高い性能
5. 実験結果
10
• denoising
5. 実験結果
11
• Super Resolution
12
• Occupancy
6. 考察・所感
13
• 所感
– タスクごとに,現状より適したモデルは存在するはず
– INRの領域でも,モデル構造の最適化が進んでいる印象
– MLPが現段階では採用されているが,置き換わっていくのかもしれない
引用
14
[1] 図 http://www.sanko-shoko.net/note.php?id=js3z
[2] Mildenhall, Ben, et al. "Nerf: Representing scenes as neural radiance
fields for view synthesis." Communications of the ACM 65.1 (2021): 99-
106.
[3] Sitzmann, Vincent, et al. "Implicit neural representations with periodic
activation functions." Advances in Neural Information Processing
Systems 33 (2020): 7462-7473.
引用
15
[4] Ramasinghe, Sameera, and Simon Lucey. "Beyond periodicity:
Towards a unifying framework for activations in coordinate-
mlps." European Conference on Computer Vision. Springer, Cham, 2022.
[5] https://friedrice-
mushroom.hatenablog.com/entry/2019/08/31/113915

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【DL輪読会】WIRE: Wavelet Implicit Neural Representations

  • 1. DEEP LEARNING JP [DL Papers] “WIRE: Wavelet Implicit Neural Representations” Presenter: Takahiro Maeda D2 (Toyota Technological Institute) http://deeplearning.jp/
  • 2. 目次 1. 書誌情報 2. 概要 3. 研究背景 4. 提案手法 5. 実験結果 6. 考察・所感 2
  • 3. 1. 書誌情報 紹介論文 タイトル: WIRE: Wavelet Implicit Neural Representations 出典: ArXiv (2023. 1) 著者: Vishwanath Saragadam et. al. 所属: Rice University 選書理由 NeRFなどのImplicit Neural Representation (INR) と, 活性化関数との相性について初見だったため ※引用は最後にまとめてあります.特に明示が無い場合は紹介論文から引用 3
  • 4. 2. 概要 4 WIRE • NeRFなどの画像用INRの活性化関数にWaveletを提案 • Waveletが画像表現に適しているため,正しい帰納バイアスを 獲得 • ノイズ除去,SR,任意視点生成などで精度向上
  • 5. 3. 研究背景 5 • Implicit Neural Representations (INR) 近年,INRの性能は, 活性化関数に大きく左右されるらしいと 判明 [1] • Grid-based 手法 • INR (NeRF) 𝜃 (座標) MLP 重み保持 グリッドデータ保持 • 保持すべきメモリが大き い • 解像度が限定される • コンパクトな重みのみを 保持 • 任意解像度で生成可 [2]
  • 6. 3. 研究背景 6 • 活性化関数とINRの性能 – ReLU (default NeRF) 処理重,精度悪,ノイズ耐性悪 – Sine波 (SIREN[3]),Gaussian[4] 処理軽,精度良,ノイズ耐性悪 • 直線で自然信号を近似するため,より層を重ねる必要 • 細部の再現には,positional encodingなどの追加の工夫必要 • 周期的な信号に強 い • 局所的な信号に強い • 曲線を持つため,少ない層数で自然信号を近似 可 • 表現力が高いため,ノイズ信号も近似してしま う
  • 7. 3. 研究背景 7 • 連続Wavelet変換 – 局所的な波の集合によって,信号を時間-周波数空間へ変換 – 非定常な信号(現実におけるほぼすべての信号)の解析によく用いられる – JPEGの上位互換であるJPEG2000でも用いられる [5] Wavelet
  • 8. 4. 提案手法 8 • WIRE: Wavelet Implicit Neural Representations – INRの活性化関数に Waveletを提案 – 局所的,周期的信号どちらにも対応可 – JPEG2000のようにWaveletが画像表現に適しているため, 正しい帰納バイアスを獲得できノイズへの頑健性向上 (これ以上の説明は無,デノイズでの精度向上で証明) – ネットワーク内部では,Waveletを複素数のまま処理する 処理軽,精度良,ノイズ耐性良
  • 13. 6. 考察・所感 13 • 所感 – タスクごとに,現状より適したモデルは存在するはず – INRの領域でも,モデル構造の最適化が進んでいる印象 – MLPが現段階では採用されているが,置き換わっていくのかもしれない
  • 14. 引用 14 [1] 図 http://www.sanko-shoko.net/note.php?id=js3z [2] Mildenhall, Ben, et al. "Nerf: Representing scenes as neural radiance fields for view synthesis." Communications of the ACM 65.1 (2021): 99- 106. [3] Sitzmann, Vincent, et al. "Implicit neural representations with periodic activation functions." Advances in Neural Information Processing Systems 33 (2020): 7462-7473.
  • 15. 引用 15 [4] Ramasinghe, Sameera, and Simon Lucey. "Beyond periodicity: Towards a unifying framework for activations in coordinate- mlps." European Conference on Computer Vision. Springer, Cham, 2022. [5] https://friedrice- mushroom.hatenablog.com/entry/2019/08/31/113915

Editor's Notes

  1. という論文を紹介します.
  2. まず,書誌情報です.