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研究生:盧佳妤
研究生(外文):Lu, Jia-Yu
論文名稱:基於注意力機制語言模型之財務風險文章偵測與實體辨識
論文名稱(外文):Financial Risk-related News Detection and Named Entity Recognition via Transformer-based Language Models
指導教授:蔡銘峰蔡銘峰引用關係
指導教授(外文):Tsai, Ming-Feng
口試委員:蔡銘峰王釧茹蘇家玉
口試委員(外文):Tsai, Ming-FengWang, Chuan-JuSu, Chia-Yu
口試日期:2021-08-31
學位類別:碩士
校院名稱:國立政治大學
系所名稱:資訊科學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2021
畢業學年度:110
語文別:中文
論文頁數:35
中文關鍵詞:注意力機制模型聯合訓練實體辨識自然語言處理
外文關鍵詞:TransformerAttention mechanismJoint trainingNamed-entity recognizationNatual language processing
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  • 被引用被引用:0
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本研究利用注意力機制模型偵測財務文章之風險事件及抽取潛在金融犯罪名單,建構自動化模型以降低人力標記成本及提升預測速度。我們分析不同模型架構及訓練方法之優缺點,並比較傳統神經網路方法與 Transformer Based 模型的差異。模型架構分為兩階段,第一階段判斷目標文章是否包含金融風險事件,而第二階段則在這些文章中抽取高危險的名單。我們提出聯合訓練方法同時訓練兩階段的模型,透過實驗證明可在不損失正確性的情況提升訓練及預測速度,並得以提升模型穩定性。我們亦針對注意力機制模型內部的 Attention Weight 做視覺化分析,顯示模型能在不提供標注的情況自動關注金融風險詞彙。另外我們針對缺乏風險人名標記的訓練資料之情況,利用以上 Attention Weight 分析設計特殊的規則,達到一定程度的效果提升。最後我們額外在一個 Wikipedia 上的英文資料集做測試,說明此研究結果亦可應用於不同領域及不同語言的任務。
This thesis uses transformer-based models to detect risk events from financial articles and extract potential financial criminals. With such automated models, we can reduce human costs on labeling and increase prediction performance. In this thesis, we analyze the advantages and disadvantages of different approaches and compare the differences between traditional neural networks and
Transformer-based models. The proposed method contains two stages: the first stage determines whether the target news contains financial risk events, and the second stage extracts high-risk entities from the news. We propose a
joint-training method to train these two stages at the same time. Experimental results show that the proposed joint-training method improves prediction accuracy and enhances the stability of the training process. We also visualize
the attention weights of the attention mechanism model, showing that the model automatically pays attention to financial risk vocabularies without providing annotations. In addition, we use the above attention weight scheme to design special rules, achieving a certain degree of effect improvement for the case that lacks risk-name-annotation. Finally, further experiments conducted on a dataset from English Wikipedia confirm that the proposed method can also apply to different domains and languages.
致謝 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vi
表目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究目的與貢獻 3
第二章 相關文獻探討 4
2.1 自然語言中的文字表示法 4
2.2 中文斷詞 5
2.3 循環神經網路 5
2.4 Transformer-Based模型 5
2.4.1 注意力機制模型 5
2.4.2 Transformer 6
2.4.3 BERT 6
2.5 命名實體識別 7
第三章 研究方法 9
3.1 問題定義 9
3.2 模型簡介 10
3.2.1 新聞文本分類任務 — CLASS任務 12
3.2.2 實體辨識任務 — NER任務 13
3.2.3 聯合訓練 — Joint Training 13
3.3 各種架構之模型實作方式 14
3.3.1 LSTM架構實作 14
3.3.2 Attention架構實作 15
3.3.3 混合使用LSTM與Attention架構 16
3.3.4 BERT架構實作 17
3.4 利用Attention Weight配合通用NER工具之實作 17
第四章 實驗結果 19
4.1 資料說明 19
4.1.1 Wikipedia資料(Wiki資料集) 19
4.1.2 新聞資料(News資料集) 20
4.2 實驗設定 20
4.3 實驗結果分析 21
4.3.1 文章分類結果 21
4.3.2 實體辨識結果 23
4.3.3 目標實體抽取結果 25
4.4 模型訓練參數分析 28
4.4.1 依Positive及Negative資料比例調整Loss權重之分析 28
4.4.2 Joint模型兩任務Loss之權重比較 29
4.5 Attention NER模型學習到之資訊分析 30
4.6 Attention Weight分析 30
第五章 結論 32
參考文獻 34
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