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Essays on Adaptive Experimentation: Bringing Real-World Challenges to Multi-Armed Bandits
Essays on Adaptive Experimentation: Bringing Real-World Challenges to Multi-Armed Bandits
Essays on Adaptive Experimentation: Bringing Real-World Challenges to Multi-Armed Bandits

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152941
ISBN  
9798384482024
DDC  
004
저자명  
Qin, Chao.
서명/저자  
Essays on Adaptive Experimentation: Bringing Real-World Challenges to Multi-Armed Bandits
발행사항  
[Sl] : Columbia University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
220 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: A.
주기사항  
Advisor: Russo, Daniel.
학위논문주기  
Thesis (Ph.D.)--Columbia University, 2024.
초록/해제  
요약Classical randomized controlled trials have long been the gold standard for estimating treatment effects. However, adaptive experimentation, especially through multi-armed bandit algorithms, aims to improve efficiency beyond traditional randomized controlled trials. While there is a vast literature on multi-armed bandits, a simple yet powerful framework in reinforcement learning, real-world challenges can hinder the successful implementation of adaptive algorithms. This thesis seeks to bridge this gap by integrating real-world challenges into multi-armed bandits.The first chapter examines two competing priorities that practitioners often encounter in adaptive experiments: maximizing total welfare through effective treatment assignments and swiftly conducting experiments to implement population-wide treatments. We propose a unified model that simultaneously accounts for within-experiment performance and post-experiment outcomes. We provide a sharp theory of optimal performance that not only unifies canonical results from the literature on regret minimization and best-arm identification but also uncovers novel insights. Our theory reveals that familiar algorithms, such as the recently proposed top-two Thompson sampling algorithm, can optimize a broad class of objectives if a single scalar parameter is appropriately adjusted. Furthermore, we demonstrate that substantial reductions in experiment duration can often be achieved with minimal impact on total regret.The second chapter studies the fundamental tension between the distinct priorities of non-adaptive and adaptive experiments: robustness to exogenous variation and efficient information gathering. We introduce a novel multi-armed bandit model that incorporates nonstationary exogenous factors, and propose deconfounded Thompson sampling, a more robust variant of the prominent Thompson sampling algorithm. We provide bounds on both within-experiment and post-experiment regret of deconfounded Thompson sampling, illustrating its resilience to exogenous variation and the delicate balance it strikes between exploration and exploitation. Our proofs leverage inverse propensity weights to analyze the evolution of the posterior distribution, a departure from established methods in the literature. Hinting that new understanding is indeed necessary, we demonstrate that a deconfounded variant of the popular upper confidence bound algorithm can fail completely.
일반주제명  
Computer science
일반주제명  
Statistics
일반주제명  
Information science
키워드  
Adaptive experiments
키워드  
Real-world challenges
키워드  
Multi-armed bandit
키워드  
Deconfounded Thompson sampling
기타저자  
Columbia University Business
기본자료저록  
Dissertations Abstracts International. 86-04A.
전자적 위치 및 접속  
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MARC

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■1001  ▼aQin,  Chao.
■24510▼aEssays  on  Adaptive  Experimentation:  Bringing  Real-World  Challenges  to  Multi-Armed  Bandits
■260    ▼a[Sl]▼bColumbia  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a220  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  A.
■500    ▼aAdvisor:  Russo,  Daniel.
■5021  ▼aThesis  (Ph.D.)--Columbia  University,  2024.
■520    ▼aClassical  randomized  controlled  trials  have  long  been  the  gold  standard  for  estimating  treatment  effects.  However,  adaptive  experimentation,  especially  through  multi-armed  bandit  algorithms,  aims  to  improve  efficiency  beyond  traditional  randomized  controlled  trials.  While  there  is  a  vast  literature  on  multi-armed  bandits,  a  simple  yet  powerful  framework  in  reinforcement  learning,  real-world  challenges  can  hinder  the  successful  implementation  of  adaptive  algorithms.  This  thesis  seeks  to  bridge  this  gap  by  integrating  real-world  challenges  into  multi-armed  bandits.The  first  chapter  examines  two  competing  priorities  that  practitioners  often  encounter  in  adaptive  experiments:  maximizing  total  welfare  through  effective  treatment  assignments  and  swiftly  conducting  experiments  to  implement  population-wide  treatments.  We  propose  a  unified  model  that  simultaneously  accounts  for  within-experiment  performance  and  post-experiment  outcomes.  We  provide  a  sharp  theory  of  optimal  performance  that  not  only  unifies  canonical  results  from  the  literature  on  regret  minimization  and  best-arm  identification  but  also  uncovers  novel  insights.  Our  theory  reveals  that  familiar  algorithms,  such  as  the  recently  proposed  top-two  Thompson  sampling  algorithm,  can  optimize  a  broad  class  of  objectives  if  a  single  scalar  parameter  is  appropriately  adjusted.  Furthermore,  we  demonstrate  that  substantial  reductions  in  experiment  duration  can  often  be  achieved  with  minimal  impact  on  total  regret.The  second  chapter  studies  the  fundamental  tension  between  the  distinct  priorities  of  non-adaptive  and  adaptive  experiments:  robustness  to  exogenous  variation  and  efficient  information  gathering.  We  introduce  a  novel  multi-armed  bandit  model  that  incorporates  nonstationary  exogenous  factors,  and  propose  deconfounded  Thompson  sampling,  a  more  robust  variant  of  the  prominent  Thompson  sampling  algorithm.  We  provide  bounds  on  both  within-experiment  and  post-experiment  regret  of  deconfounded  Thompson  sampling,  illustrating  its  resilience  to  exogenous  variation  and  the  delicate  balance  it  strikes  between  exploration  and  exploitation.  Our  proofs  leverage  inverse  propensity  weights  to  analyze  the  evolution  of  the  posterior  distribution,  a  departure  from  established  methods  in  the  literature.  Hinting  that  new  understanding  is  indeed  necessary,  we  demonstrate  that  a  deconfounded  variant  of  the  popular  upper  confidence  bound  algorithm  can  fail  completely.
■590    ▼aSchool  code:  0054.
■650  4▼aComputer  science
■650  4▼aStatistics
■650  4▼aInformation  science
■653    ▼aAdaptive  experiments
■653    ▼aReal-world  challenges
■653    ▼aMulti-armed  bandit
■653    ▼aDeconfounded  Thompson  sampling
■690    ▼a0796
■690    ▼a0984
■690    ▼a0463
■690    ▼a0723
■71020▼aColumbia  University▼bBusiness.
■7730  ▼tDissertations  Abstracts  International▼g86-04A.
■790    ▼a0054
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164270▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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