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Stochastic Optimization and Learning: An Adaptive and Resource-Efficient Approach- [electronic resource]
Stochastic Optimization and Learning: An Adaptive and Resource-Efficient Approach - [elect...
Stochastic Optimization and Learning: An Adaptive and Resource-Efficient Approach- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101243
ISBN  
9798380314299
DDC  
621.3
저자명  
Salgia, Sudeep.
서명/저자  
Stochastic Optimization and Learning: An Adaptive and Resource-Efficient Approach - [electronic resource]
발행사항  
[S.l.]: : Cornell University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(502 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Zhao, Qing.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약This dissertation focuses on stochastic optimization and learning where the underlying probabilistic models are unknown and the decision maker optimizes their actions over time through sequential interactions with the unknown environment.The first part of this dissertation is on stochastic optimization where the learner aims at optimizing an unknown random loss function in expectation --- the fundamental building block of training any machine learning model today. In the centralized setting, we study three different classes of stochastic optimization problems, categorized based on the structural assumptions of the unknown function. For stochastic convex optimization, we propose the first extension of the coordinate minimization (CM) approach to stochastic optimization. The proposed approach provides a universal framework for extending low-dimensional optimization routines to high-dimensional problems and inherits the scalability and parallelizability properties of CM. For kernel-based optimization, we propose the first algorithm with order-optimal regret guarantees thereby closing the existing gap between upper and lower bounds. Thirdly, for neural net based optimization for contextual bandits, we explore the setting where neural nets are equipped with a smooth activation function, in contrast to the existing work which primarily focuses on ReLU neural nets. In the second part of this dissertation, we focus on challenges unique to distributed stochastic optimization. For the problem of distributed linear bandits, we investigate the regret-communication trade-off by establishing the information-theoretic lower bounds on the required communications (in terms of bits) for achieving a sublinear regret order. We also develop an efficient algorithm that is the first to achieve both order-optimal regret and optimal order of communication cost (in bits). We also extend our algorithm for stochastic convex optimization where it continues to enjoy order-optimal regret and communication performance. Secondly, we study the impact of statistical heterogeneity among clients in a distributed kernel-based bandit framework. We adopt a personalization approach to tackle the heterogeneity among users propose an algorithm that achieves order-optimal regret through a novel design that carefully balances personalized exploration with collaborative exploration.The third part of the dissertation focuses on problems arising in Active Learning and Active Hypothesis Testing. For the problem of online active learning for classifying streaming instances, we develop a disagreement-based learning algorithm for a general hypothesis space and noise model that incurs a bounded regret and has an order-optimal label complexity. We also study the problem of noisy group testing under unknown noise models, which is contrast to the existing studies that assume perfect knowledge of probabilistic model of the noise. We propose a novel algorithm that is agnostic to the noise distribution and offers a sample complexity that adapts to the noise level and is order-optimal in both the population size and the error rate. In the last chapter, we consider the problem of uniformity testing of Lipschitz continuous distributions with bounded support. We propose a sequential test that offers adaptivity to the unknown $\\ell_1$ distance to the uniform distribution, allowing quicker identification of more anomalous (non-uniform) distributions.
일반주제명  
Electrical engineering.
일반주제명  
Computer science.
일반주제명  
Statistics.
키워드  
Adaptive group
키워드  
Bandits
키워드  
Communication efficient algorithms
키워드  
Computationally efficient algorithm
키워드  
Machine learning
키워드  
Stochastic optimization
기타저자  
Cornell University Electrical and Computer Engineering
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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MARC

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■020    ▼a9798380314299
■035    ▼a(MiAaPQ)AAI30528911
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a621.3
■1001  ▼aSalgia,  Sudeep.▼0(orcid)0000-0003-1361-4565
■24510▼aStochastic  Optimization  and  Learning:  An  Adaptive  and  Resource-Efficient  Approach▼h[electronic  resource]
■260    ▼a[S.l.]:▼bCornell  University.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(502  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Zhao,  Qing.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aThis  dissertation  focuses  on  stochastic  optimization  and  learning  where  the  underlying  probabilistic  models  are  unknown  and  the  decision  maker  optimizes  their  actions  over  time  through  sequential  interactions  with  the  unknown  environment.The  first  part  of  this  dissertation  is  on  stochastic  optimization  where  the  learner  aims  at  optimizing  an  unknown  random  loss  function  in  expectation  ---  the  fundamental  building  block  of  training  any  machine  learning  model  today.  In  the  centralized  setting,  we  study  three  different  classes  of  stochastic  optimization  problems,  categorized  based  on  the  structural  assumptions  of  the  unknown  function.  For  stochastic  convex  optimization,  we  propose  the  first  extension  of  the  coordinate  minimization  (CM)  approach  to  stochastic  optimization.  The  proposed  approach  provides  a  universal  framework  for  extending  low-dimensional  optimization  routines  to  high-dimensional  problems  and  inherits  the  scalability  and  parallelizability  properties  of  CM.  For  kernel-based  optimization,  we  propose  the  first  algorithm  with  order-optimal  regret  guarantees  thereby  closing  the  existing  gap  between  upper  and  lower  bounds.  Thirdly,  for  neural  net  based  optimization  for  contextual  bandits,  we  explore  the  setting  where  neural  nets  are  equipped  with  a  smooth  activation  function,  in  contrast  to  the  existing  work  which  primarily  focuses  on  ReLU  neural  nets.  In  the  second  part  of  this  dissertation,  we  focus  on  challenges  unique  to  distributed  stochastic  optimization.  For  the  problem  of  distributed  linear  bandits,  we  investigate  the  regret-communication  trade-off  by  establishing  the  information-theoretic  lower  bounds  on  the  required  communications  (in  terms  of  bits)  for  achieving  a  sublinear  regret  order.  We  also  develop  an  efficient  algorithm  that  is  the  first  to  achieve  both  order-optimal  regret  and  optimal  order  of  communication  cost  (in  bits).  We  also  extend  our  algorithm  for  stochastic  convex  optimization  where  it  continues  to  enjoy  order-optimal  regret  and  communication  performance.  Secondly,  we  study  the  impact  of  statistical  heterogeneity  among  clients  in  a  distributed  kernel-based  bandit  framework.  We  adopt  a  personalization  approach  to  tackle  the  heterogeneity  among  users  propose  an  algorithm  that  achieves  order-optimal  regret  through  a  novel  design  that  carefully  balances  personalized  exploration  with  collaborative  exploration.The  third  part  of  the  dissertation  focuses  on  problems  arising  in  Active  Learning  and  Active  Hypothesis  Testing.  For  the  problem  of  online  active  learning  for  classifying  streaming  instances,  we  develop  a  disagreement-based  learning  algorithm  for  a  general  hypothesis  space  and  noise  model  that  incurs  a  bounded  regret  and  has  an  order-optimal  label  complexity.  We  also  study  the  problem  of  noisy  group  testing  under  unknown  noise  models,  which  is  contrast  to  the  existing  studies  that  assume  perfect  knowledge  of  probabilistic  model  of  the  noise.  We  propose  a  novel  algorithm  that  is  agnostic  to  the  noise  distribution  and  offers  a  sample  complexity  that  adapts  to  the  noise  level  and  is  order-optimal  in  both  the  population  size  and  the  error  rate.  In  the  last  chapter,  we  consider  the  problem  of  uniformity  testing  of  Lipschitz  continuous  distributions  with  bounded  support.  We  propose  a  sequential  test  that  offers  adaptivity  to  the  unknown  $\\ell_1$  distance  to  the  uniform  distribution,  allowing  quicker  identification  of  more  anomalous  (non-uniform)  distributions.
■590    ▼aSchool  code:  0058.
■650  4▼aElectrical  engineering.
■650  4▼aComputer  science.
■650  4▼aStatistics.
■653    ▼aAdaptive  group
■653    ▼aBandits
■653    ▼aCommunication  efficient  algorithms
■653    ▼aComputationally  efficient  algorithm
■653    ▼aMachine  learning
■653    ▼aStochastic  optimization
■690    ▼a0544
■690    ▼a0984
■690    ▼a0463
■71020▼aCornell  University▼bElectrical  and  Computer  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-03B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16933411▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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