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[DL輪読会]NAS-FPN: Learning Scalable Feature Pyramid Architecture for Object Detection
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[DL輪読会]NAS-FPN: Learning Scalable Feature Pyramid Architecture for Object Detection
1.
1 DEEP LEARNING JP [DL
Papers] http://deeplearning.jp/ NAS-FPN: Learning Scalable Feature Pyramid Architecture for Object Detection (CVPR’19) 2019/4/19
2.
書誌情報 • NAS-FPN: Learning
Scalable Feature Pyramid Architecture for Object Detection • Golnaz Ghiasi, Tsung-Yi Lin, Ruoming Pang, Quoc V. Le • Google Brain • CVPR’19 • https://arxiv.org/abs/1904.07392 • FPN (Feature-Pyramid Network) に対するNASの適用 2019/4/19 2
3.
Neural Architecture Search
(NAS) • ネットワークアーキテクチャの自動設計 • 探索対象 レイヤーの種類 レイヤー数 パラメータ数 … • なんでもかんでも探索するのは難しいので,いかにいい感じに探索範囲を 定義するかがコツ 2019/4/19 3
4.
NASの基本 • Controller RNNでアーキテクチャ をサンプリング
(child network) • Child networkを訓練 • 訓練結果をもとにコントローラを更新 • コントローラの訓練方法 強化学習 進化計算 ベイズ最適化 2019/4/19 4 http://rll.berkeley.edu/deeprlcoursesp17/docs/quoc_barret.pdf
5.
NASNet • CNN向けのアーキテクチャ探索 • 全体の構造は事前に決めておく •
“Cell”の構造を探索 2019/4/19 Cell CellController RNN 5
6.
この研究 • 最近の物体認識では,FPN (Feature
Pyramid Network) をベースにしたものが多い点に注目 • 従来のNASでは対応していなかった, FPNの全てのcorss-scaleの接続を カバーする探索空間を定義 • ベースのアーキテクチャとしては RetinaNetを採用 • コントローラベースのNASで探索 2019/4/19 6 Feature Pyramid Networks for Object Detection (CVPR’17)
7.
提案手法 (NAS-FPN) 2019/4/19 7 Backbone
Network (ResNet MobileNet ) : multiscale feature : FPN : : RetinaNet base
8.
探索方法 • Controller RNNで,”merging
cell” を探索 • merging cellの出力は,次回以降の入力の候補になる • 最後の5つのmerging cellの出力が,feature pyramidの出力となる 2019/4/19 8 merging cell
9.
実装 • Proxy Task
良いFPN構造か判断するために利用 backbone: ResNet-10 入力 512x512, 10epoch ~1時間程度の訓練 • Controller RNN, PPO, APがreward 100 TPUs workqueue 8000stepで収束 2019/4/19 9
10.
実験パラメータ • batchsize 64 •
multiscale training (random scale between [0.8, 1.2]) • focal loss α = 0.25, γ=1.6 • weight decay 0.0001 • momentum 0.9 • training 50 epoch / 150 epoch (when using DropBlock) • learning rate: 0.08, decayed 0.1 at 30 (120) and 40 (140) epochs 入力1280x1280のAmoebaNetのときはcosine learning rate • COCO 2017 dataset 2019/4/19 10
11.
探索過程 2019/4/19 11 cross-scale (e.g., high
resolution input output feature layer ) feature reuse ( )
12.
最終的な探索結果 2019/4/19 12 ( (f)
NAS-FPN/16.8AP)
13.
得られたFPN構造の評価 2019/4/19 13 (FPN backbone
!= backbone)
14.
性能比較 2019/4/19 14 accurate model
fast model (for mobile) FPN
15.
性能比較 2019/4/19 15
16.
DropBlockの効果 • BNのあとに3x3のDropBlockを 適用した場合 (右図) 2019/4/19
16
17.
Any-time detection • NAS-FPNは,構造的にFPNの途中の 出力を利用して推論することも可能 (early
exit) • deep supervision有りで訓練した モデルと,deep supervision無し で訓練 + early exit したモデル の精度はだいたい同じ (右図) 2019/4/19 17
18.
まとめ • RetinaNetをベースにFPNにNASを適用 • 新しい点
merging cellを使ってcross-scaleな接続を学習可能にした • 割と既存手法のシンプルな応用 • この辺の話はどんどん増えていきそう データセットを変えるとアーキテクチャに変化があるのか? DARTSなどコントーラを利用しないNASでの応用? 2019/4/19 18
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