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kuzushiji-10th-place
1.
Kaggle:くずし字コンペ参戦記 全景株式会社 Nguyen Ngoc Giang グエン・ゴク・ジャン
2.
Kaggleのくずし字 コンペ
3.
Kaggleのくずし字コンペ 入力 出力
4.
Kaggleのくずし字コンペ • 3881写真 • 4212種類(仮名+漢字) •
~68万文字 写真の幅と高さ トレーニングデータのフォーマット
5.
Kaggleのくずし字コンペ • トレーニングデータ:28本から
6.
Kaggleのくずし字コンペ • Test Dataset •
4150 写真
7.
オブジェクト検出 • 写真分類 vs
オブジェクト検出 犬がいる 猫がいる
8.
オブジェクト検出 • Sliding window 写真 分類 モデル 犬が いる/いない
9.
オブジェクト検出 • Anchor
10.
オブジェクト検出 • Faster-RCNN • Faster-RCNN
11.
オブジェクト検出 • FasterーRCNN
12.
Step-1: Gradient Accumulation •
1ページ:平均~200キャラクター GPU: 11Gb memory -> batch_size = 1(1つサンプルずつ) スコア: 0.58 Gradient Accumulation = 16 ~ batch_size=16 (16サンプルのlossを計算して、モデルのweightsをupdateし ます) スコア: 0.80
13.
Step-2: False Negative •
F1 スコア • 敷居:0.6 => スコア: 0.83 キャラ クター 検出 モデル 0.0 0.0 . . 0.9 . . 0.0 sum=1.0 softmax あ い . . す . . わ
14.
Step-3: Anchor size •
Anchor size • 1 anchor box – 1キャラクター =>sizeを減らす =>スコア: 0.88
15.
Step-5 • キャラクターの位置認識とキャラクター分類を分ける • キャラクターの位置を認識精度~98.5% •
キャラクター分類精度~90% =>スコア:0.89 キャラ クター の位置 検出 モデル キャラ クター 分類 モデル Crop き
16.
Step-6 • TTA • Random
Crop • Random Contrast, Brightness =>スコア:0.896
17.
Step-7 • KMNIST –
変体仮名 • 49 クラス – 270912 写真 => スコア: 0.903 (私たちの最高スコア)
18.
例結果
19.
コンペの結果
20.
優勝チームに参考 • Region crop •
キャラクターの周りの情報を含める • スコア:0.93
21.
優勝チームに参考 • Pseudo-Label • テストデータの手書き風を教 える •
スコア:0.94
22.
優勝チームに参考 • Ensemble • 一つのモデルだけじゃなくて、数モデルの推定を組み合わせる •
スコア:0.95
23.
まとめ • 初めてKaggleコンペに参加して、Top 10に入りました。 •
オブジェクト認識技術をよりよく理解しました。 • 優秀な人(Grandmaster)から役に立つ手法を学びました。 • Kaggle Masterになりたい: • 2銅メダル • 2銀メダル • 1金メダル
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