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Ideology Analysis for Social-Media Users via Multi-Modal Data Mining
Ideology Analysis for Social-Media Users via Multi-Modal Data Mining
Ideology Analysis for Social-Media Users via Multi-Modal Data Mining

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자료유형  
 학위논문 서양
최종처리일시  
20250211151938
ISBN  
9798382774770
DDC  
004
저자명  
Xiao, Zhiping.
서명/저자  
Ideology Analysis for Social-Media Users via Multi-Modal Data Mining
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
169 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-11, Section: A.
주기사항  
Advisor: Sun, Yizhou;Porter, Mason A.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Analyzing public opinions on political affairs never fails to attract researchers' attention. One popular application is analyzing ideologies of the ordinary citizens. Traditionally, researchers collect public opinions by conducting surveys, interviews, or estimate via the roll call data. It took a lot of time to come to a conclusion, and it was also hard to find representative objects and keep the objects' opinions unaffected by researchers who design the survey questions. By using social media data, some of the previously-mentioned problems are mitigated due to the unprecedented massive scale. However, we need to keep in mind that social media data might be systematically biased in some other ways. For instance, those who never use social media could not be included.In recent years, social media, such as Twitter, plays an increasingly important role in people's life. People express opinions, digest information, and interact on social medias. All these behaviors left massive amount of observable clues online, which we collect as our data. Centered around the problems on political ideology analysis, we start from collecting a list of politicians who have verified accounts on Twitter. Then we build our data sets from the Twitter accounts who are not further than one hop away from the politicians, directly following or are followed by the politicians. Although it becomes much easier to collect massive amount of data in an efficient and timely manner, social media data bring us unique challenges. For example: (1) we need to deal with the data size which is typically large; (2) there are seldom ground-truth knowledge on social media data, which leads to the lack of labels; (3) we need to consider how to deal with the multi-modality nature of our data.f we view each user account as a node, their interactive behaviors could be modeled as links in between. Since they interact in multiple ways, the graph structure we form is heterogeneous. If we view each account as an individual information source, we could represent its feature by the collection of tweets it posted in the past. If we consider temporal information as well, the whole system could also be regarded as a multi-agent dynamic system. Based on the observation of the data, we have proposed the following research problems to answer:(1) Can we rely solely on the user behavior data, represented as heterogeneous types of links in the graph structure, to reveal the users' ideologies? (2) Can we rely solely on the text information from tweets, to reveal the users' political polarities?(3) By learning from the historical data on social media, containing text, link, and temporal information, can we predict the future trend?To answer the first research problem, we proposed a model that successfully uses the heterogeneous types of relations, called TIMME (Twitter Ideology-detection via Multi-task Multi-relational Embedding). Challenges come from (1) the extreme sparsity of the labels, (2) the incompleteness of the input features, and (3) the heterogeneous types of links. TIMME is overall better than the state-of-the-art models for ideology detection on Twitter. In theory, it could be extended to other data sets, and could be apply to tasks other than ideology detection.The work we've done to answer the second problem resulted in an embedding approach called PEM (i.e., Polarity-Aware Embeddings Using Multi-Task Learning). The ideological divisions in the United States have become increasingly prominent in daily communication, and a lot of research has been conducted. We propose to quantify political polarity in social-media text data using a polarity-aware method of learning word representations. By learning a word embedding with an explicit polarity dimension, one can infer the polarity of a post and therefore of the social-media account that produced it. Decomposing a traditional embedding into a polarity-neutral semantic component and a polarity-aware component is a major challenge. Very sparse labels is another key challenge. Our experimental results demonstrate that our model can successfully learn high-quality polarity-aware embeddings.The third research question is answered by our next project, a social dynamic system model that captures the updating patterns in real-world social network data sets. We faced challenges on both the data end and the model end. From the data set, there is no existing publicly-available data sets on real-world social network observations. From the model perspective, modeling continuous time is trickier than modeling discrete time by nature. After decided that we should consider using following the Neural-ODE framework, other challenges came about, such as the data size, and the selection of an appropriate decoder task. Our experimental results show that the framework we propose is capable of learning the dynamic changes in the social network data sets. And our framework could also be used to verify how well an opinion dynamic model captures the changes of a specific real-world data set, under a given task. 
일반주제명  
Computer science
일반주제명  
Computer engineering
일반주제명  
Web studies
키워드  
Data mining
키워드  
Deep learning
키워드  
Ideology analysis
키워드  
Machine learning
키워드  
Multimodal datasets
키워드  
Social network
기타저자  
University of California, Los Angeles Computer Science 0201
기본자료저록  
Dissertations Abstracts International. 85-11A.
전자적 위치 및 접속  
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MARC

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■1001  ▼aXiao,  Zhiping.
■24510▼aIdeology  Analysis  for  Social-Media  Users  via  Multi-Modal  Data  Mining
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a169  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  A.
■500    ▼aAdvisor:  Sun,  Yizhou;Porter,  Mason  A.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aAnalyzing  public  opinions  on  political  affairs  never  fails  to  attract  researchers'  attention.  One  popular  application  is  analyzing  ideologies  of  the  ordinary  citizens.  Traditionally,  researchers  collect  public  opinions  by  conducting  surveys,  interviews,  or  estimate  via  the  roll  call  data.  It  took  a  lot  of  time  to  come  to  a  conclusion,  and  it  was  also  hard  to  find  representative  objects  and  keep  the  objects'  opinions  unaffected  by  researchers  who  design  the  survey  questions.  By  using  social  media  data,  some  of  the  previously-mentioned  problems  are  mitigated  due  to  the  unprecedented  massive  scale.  However,  we  need  to  keep  in  mind  that  social  media  data  might  be  systematically  biased  in  some  other  ways.  For  instance,  those  who  never  use  social  media  could  not  be  included.In  recent  years,  social  media,  such  as  Twitter,  plays  an  increasingly  important  role  in  people's  life.  People  express  opinions,  digest  information,  and  interact  on  social  medias.  All  these  behaviors  left  massive  amount  of  observable  clues  online,  which  we  collect  as  our  data.  Centered  around  the  problems  on  political  ideology  analysis,  we  start  from  collecting  a  list  of  politicians  who  have  verified  accounts  on  Twitter.  Then  we  build  our  data  sets  from  the  Twitter  accounts  who  are  not  further  than  one  hop  away  from  the  politicians,  directly  following  or  are  followed  by  the  politicians.  Although  it  becomes  much  easier  to  collect  massive  amount  of  data  in  an  efficient  and  timely  manner,  social  media  data  bring  us  unique  challenges.  For  example:  (1)  we  need  to  deal  with  the  data  size  which  is  typically  large;  (2)  there  are  seldom  ground-truth  knowledge  on  social  media  data,  which  leads  to  the  lack  of  labels;  (3)  we  need  to  consider  how  to  deal  with  the  multi-modality  nature  of  our  data.f  we  view  each  user  account  as  a  node,  their  interactive  behaviors  could  be  modeled  as  links  in  between.  Since  they  interact  in  multiple  ways,  the  graph  structure  we  form  is  heterogeneous.  If  we  view  each  account  as  an  individual  information  source,  we  could  represent  its  feature  by  the  collection  of  tweets  it  posted  in  the  past.  If  we  consider  temporal  information  as  well,  the  whole  system  could  also  be  regarded  as  a  multi-agent  dynamic  system.  Based  on  the  observation  of  the  data,  we  have  proposed  the  following  research  problems  to  answer:(1)  Can  we  rely  solely  on  the  user  behavior  data,  represented  as  heterogeneous  types  of  links  in  the  graph  structure,  to  reveal  the  users'  ideologies? (2)  Can  we  rely  solely  on  the  text  information  from  tweets,  to  reveal  the  users'  political  polarities?(3)  By  learning  from  the  historical  data  on  social  media,  containing  text,  link,  and  temporal  information,  can  we  predict  the  future  trend?To  answer  the  first  research  problem,  we  proposed  a  model  that  successfully  uses  the  heterogeneous  types  of  relations,  called  TIMME  (Twitter  Ideology-detection  via  Multi-task  Multi-relational  Embedding).  Challenges  come  from  (1)  the  extreme  sparsity  of  the  labels,  (2)  the  incompleteness  of  the  input  features,  and  (3)  the  heterogeneous  types  of  links.  TIMME  is  overall  better  than  the  state-of-the-art  models  for  ideology  detection  on  Twitter.  In  theory,  it  could  be  extended  to  other  data  sets,  and  could  be  apply  to  tasks  other  than  ideology  detection.The  work  we've  done  to  answer  the  second  problem  resulted  in  an  embedding  approach  called  PEM  (i.e.,  Polarity-Aware  Embeddings  Using  Multi-Task  Learning).  The  ideological  divisions  in  the  United  States  have  become  increasingly  prominent  in  daily  communication,  and  a  lot  of  research  has  been  conducted.  We  propose  to  quantify  political  polarity  in  social-media  text  data  using  a  polarity-aware  method  of  learning  word  representations.  By  learning  a  word  embedding  with  an  explicit  polarity  dimension,  one  can  infer  the  polarity  of  a  post  and  therefore  of  the  social-media  account  that  produced  it.  Decomposing  a  traditional  embedding  into  a  polarity-neutral  semantic  component  and  a  polarity-aware  component  is  a  major  challenge.  Very  sparse  labels  is  another  key  challenge.  Our  experimental  results  demonstrate  that  our  model  can  successfully  learn  high-quality  polarity-aware  embeddings.The  third  research  question  is  answered  by  our  next  project,  a  social  dynamic  system  model  that  captures  the  updating  patterns  in  real-world  social  network  data  sets.  We  faced  challenges  on  both  the  data  end  and  the  model  end.  From  the  data  set,  there  is  no  existing  publicly-available  data  sets  on  real-world  social  network  observations.  From  the  model  perspective,  modeling  continuous  time  is  trickier  than  modeling  discrete  time  by  nature.  After  decided  that  we  should  consider  using  following  the  Neural-ODE  framework,  other  challenges  came  about,  such  as  the  data  size,  and  the  selection  of  an  appropriate  decoder  task.  Our  experimental  results  show  that  the  framework  we  propose  is  capable  of  learning  the  dynamic  changes  in  the  social  network  data  sets.  And  our  framework  could  also  be  used  to  verify  how  well  an  opinion  dynamic  model  captures  the  changes  of  a  specific  real-world  data  set,  under  a  given  task. 
■590    ▼aSchool  code:  0031.
■650  4▼aComputer  science
■650  4▼aComputer  engineering
■650  4▼aWeb  studies
■653    ▼aData  mining
■653    ▼aDeep  learning
■653    ▼aIdeology  analysis
■653    ▼aMachine  learning
■653    ▼aMultimodal  datasets
■653    ▼aSocial  network
■690    ▼a0984
■690    ▼a0464
■690    ▼a0646
■71020▼aUniversity  of  California,  Los  Angeles▼bComputer  Science  0201.
■7730  ▼tDissertations  Abstracts  International▼g85-11A.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162144▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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