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AAAI2021
FL-MSRE: A Few-Shot Learning based Approach
to Multimodal Social Relation Extraction
2021-8-19 論⽂紹介資料
JAIST 情報科学系 修⼠1年
林 貴⽃(Hayashi Takato)
1
Hai Wan, Manrong Zhang, Jianfeng Du, Ziling Haung, Yufei Yang, Jeff Z. Pan
Related Work – Few-Shot Learning
2
Few-Shot Learning︓
少数のサンプルしかないクラスが含まれるデータでも,効率的に学習することができる学習⼿法
具体的なタスク例︓
⼩⿃×100,000枚
イヌ×100,000枚
ヘビ×100,000枚 pre-trainingに使う
⋮
ネコ×100,000枚
⽜×100,000枚
ーーーーーーーーーーーーーーー
カニ×1~5枚 こっちを分類したい(2値分類)
スカンク×1~5枚
の画像があるときに,豊富なサンプルのあるクラスの画像を使って,カニやスカンクの画像を正確に分類したい
ただし,少数データをDNNにそのまま学習させると,過学習してしまうという問題がある.
少数データ→誤差が⼤きい→パラメータの更新幅が⼤きい→過学習(ハヤシの解釈)
Wei-Yu Chen et al, “A closer Look at Few-shot Classification”, ICLR2019
Related Work – Few-Shot Learning
3
Prototypical Networks︓同じクラスは近くに,異なるクラスは遠くにマッピングする組み込み関数𝑓∅をトレーニング
Snell et al , ”Prototypical Networks for Few-shot Learning” , NeurlPS2017
Notation
• 𝒙(∈ ℝ"
)︓D dimensional samples(vector)
• 𝑆 = { 𝑥#, 𝑦# , ⋯ , 𝑥$, 𝑦$ }︓N samples which are observed as input samples
• 𝑦% ∈ 1, ⋯ , 𝐾 ︓label
• 𝑐&︓M dimensional representation, or prototype
• 𝑓∅ : ℝ"
→ ℝ'
︓Embedded function with learnable parameters ∅ ex. DNN
• d(A,B): distance function
・・・(1)
・・・(2)
Objective function︓
Related Work – Few-Shot Learning
4
N: number of examples in the training set
K: number of classes in the training set
NC(<K): number of classes per episode
NS: number of support examples per class
NQ: number of query examples per class
RandomSample(S,N):
A set of N elements chosen uniformly at
random from set S, without replacement.
Prototypical Networks︓
abstract
5
TVシリーズとその原作から,⼆⼈の顔画像,⼆⼈について⾔及されているテキスト,⼆⼈の社会
的関係性が含まれるデータセットを作成した.
顔画像とテキストを⽤いてマルチモーダルな社会的関係抽出(Social Relation Extraction:SRE) を
提案した.また,社会的関係の不均衡さに対処するために,Few-Shot Learningの⼿法を取り⼊れ
ることを提案した.
これらの⼿法を併⽤した新しいSREであるFE-MSRE(Few-Shot Learning based Approach to
Multimodal Social Relation Extraction)はテキスト単体のSREの分類精度を⼤きく上回った.
さらに,データセットに異なる画像から得られた顔画像を⽤いた場合でも,同じ画像から得られた
顔画像を⽤いた場合と同様の性能を発揮することを明らかにした.
Introduction
6
仮説︓画像とテキストがそれ単体では,認識できない部
分を補い合うことで社会的関係性の推定精度が向上する
のではないか
Case(b)︓
「hug」というキーワードから親密な⼆⼈が写っている
と推定.Barack ObamaとMaliaの顔画像から異性かつ年
齢が離れていることがわかるので⽗娘の関係と推定
Case(c)︓
「hug」というキーワードから親密な⼆⼈が写っている
と推定.Barack ObamaとMichelle Obamasの顔画像か
ら異性かつ年齢が近いことがわかるので夫婦の関係と推
定
Related Work - SRE
7
SREの研究は,⾃然⾔語処理分野や画像認識分野で⼀部⾏われているものの研究例は少ない.
特にマルチモーダルなSREについては先⾏研究がほとんど存在しない.
【Text】
・micropostsから社会的関係性を予測
Du et al 2019, “Extracting Deep Personae Social Relations in Microblog Posts”, IEEE Access 8
【Image】
・⼆⼈の顔画像から社会的関係(親しみ,⽀配的,優しさ etc.)を予測
Zhang et al 2015, “Learning Social Relation traits from Face Images”, In ICV, 3631-3639
Multimodal Social Relation Datasets
8
4つの中国の古典的⼩説とそのTVシリーズから⼆⼈の顔画像と(⼆⼈の社会的関係が推察できるよ
うな)テキスト,⼆⼈の社会的な関係性がアノーテーションされたデータセットを構築
Sentence: テキスト
Head entity(h): ⼀⼈⽬の顔の座標と名前
Tail entity(t):⼆⼈⽬の顔の座標と名前
gh:⼀⼈⽬が写っている画像
gt:⼆⼈⽬が写っている画像
r:社会的関係性
Tuples (s, h, t, gh, gt) を作成
Proposed Approach FL-MSRE
9
・Sentence Encoder
1.テキストに含まれる単語をトークン化する 𝑆 = {𝑤!, ⋯ , 𝑤"}
2.BERTで⽤いる特別なトークンを付与する 𝑆# = { 𝐶𝐿𝑆 , 𝑤!, ⋯ , 𝑤", [𝑆𝐸𝑃]}
3.事前学習済みBERTを⽤いて𝑆#をm+2個の768次元ベクトルに変換する
𝑉[%&'], 𝑉
)!
, ⋯ , 𝑉['*+]
4. ⽂章の分散表現に有効である𝑉[%&']を⽤いて,最終的なベクトルである𝐵,を出⼒する
𝐵, = tanh(𝑊!𝑉%&' + 𝑏!)
ただし, 𝑊! ∈ ℝ-./×-./,𝑏! ∈ ℝ-./はパラメータ
Proposed Approach FL-MSRE
10
・Face Encoder
1.⼀⼈⽬(h)と⼆⼈⽬(t)の顔位置の座標である𝑏1, 𝑏2を⽤いて,それぞれの写真𝑔1, 𝑔2から顔画像
だけを取り出す.次にFaceNetを⽤いて顔の特徴を1792次元のベクトルに変換する.
𝑓1,4"
= ∅(𝑐𝑟𝑜𝑝(𝑔1, 𝑏1))
𝑓2,4#
= ∅(𝑐𝑟𝑜𝑝(𝑔2, 𝑏2))
2.𝑓1,4"
と𝑓2,4#
をそれぞれについて全結合し,バッチ正則化する
𝑣1,4"
= 𝐵𝑎𝑡𝑐ℎ𝑁𝑜𝑟𝑚(𝑊5𝑓1,4"
+ 𝑏5)
𝑣2,4#
= 𝐵𝑎𝑡𝑐ℎ𝑁𝑜𝑟𝑚(𝑊6𝑓2,4#
+ 𝑏6)
3.𝑣1,4"
と𝑣2,4#
をそれぞれについてL2正則化して,結合することで最終ベクトルとする
𝐹1,2,4",4#
= [𝐿2𝑁𝑜𝑟𝑚 𝑣1,4"
; 𝐿2𝑁𝑜𝑟𝑚 𝑣2,4#
]
Proposed Approach FL-MSRE
11
・Cross-modality Encoder
1.Sentence EncoderとFace Encoderの出⼒を結合してL2正則化する.
𝐿,,1,2,4",4#
= 𝐿𝑎𝑦𝑒𝑟𝑁𝑜𝑟𝑚[𝐵,; 𝐹1,2,4",4#,]
Proposed Approach FL-MSRE
12
・Prototypical Network(N way K shot setting)
Notation
• 𝑆 = { 𝑠!!, ℎ!!, 𝑡!!, 𝑔1,!!, 𝑔2,!!, 𝑟! , ⋯ , 𝑠!7, ℎ!7, 𝑡!7, 𝑔1,!7, 𝑔2,!7, 𝑟! ,
⋮
𝑠8!, ℎ8!, 𝑡8!, 𝑔1,8!, 𝑔2,8!, 𝑟8 , ⋯ , 𝑠87, ℎ87, 𝑡87, 𝑔1,87, 𝑔2,87, 𝑟8 }︓support set
• 𝑞 = 𝑠, ℎ, 𝑡, 𝑔1, 𝑔2 : query tuple
• 𝑃"(𝑆)︓prototype of social relation m
• d(A,B): distance function
・・・(1)
・・・(2)
Experiments
13
⽐較対象︓SREタスクのためにfine-tuneしたBERTモデル
2つの顔画像収集法︓
異なる画像から⼆⼈の顔画像を抽出→⼆⼈の年齢や性別といった性質のみを考慮
同じ画像から⼆⼈の顔画像を抽出→⼆⼈が⼀緒にいる状況下での表情なども考慮
クラスの分割⽅法︓(データセット名 training : validation : test)
FC-TF 14:5:5
DRC-TF 3:3:3
OM-TF 5:5:5
Experiments
14
・Result
すべての実験においてFL-MSREはBERTプロトタイプの精度を上回る.
特に,⼆⼈の性質(年齢や性別)と社会的関係性の関連が⼤きいOM-TFでは⼤きく改善
異なる画像から顔を抽出したモデルは同じ画像から抽出したモデルと同等の性能を発揮
異なるデータセットから学習した場合でも,⼀定の性能を発揮し,モデルの安定性を⽰した
BERTプロトタイプにとっては異なる⽂体で学習したモデルでテストするので厳しい
⼀⽅で,FL-MSREは⼆⼈の性質というデータセット間で不変の情報を⽤いているため⼀定の精度を発揮できる
My future work
15
SREの論⽂を全て読む
Prototypical Networkを実装する
Few-shot Learningの様々な⼿法についての論⽂を読む

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