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Compatibility, Predictions and Optimization in Large-Scale Online Decision Making
Compatibility, Predictions and Optimization in Large-Scale Online Decision Making
Compatibility, Predictions and Optimization in Large-Scale Online Decision Making

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자료유형  
 학위논문 서양
최종처리일시  
20260202105554
ISBN  
9798263398033
DDC  
330
저자명  
Rutten, Daan.
서명/저자  
Compatibility, Predictions and Optimization in Large-Scale Online Decision Making
발행사항  
[Sl] : Georgia Institute of Technology, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
290 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Mukherjee, Debankur.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
초록/해제  
요약The last few years have seen a shift in server architecture towards large-scale, dedicateddata centers. The massive scale of these datacenters has highlighted important, unsolvedproblems in the space of load balancing, speed scaling and related areas in the optimizationof such large-scale service systems. Many of the mathematical problems abstracted fromthese challenges form fundamental problems in the field of online decision making andrequire a combination of tools from probability, stochastic processes and online algorithmstogether with completely new insights to be solvable. This thesis broadly addresses threeof these problems, as detailed below.In Chapter 2, we consider a large-scale, parallel-server system, where tasks of a particular type can only be routed to a small subset of servers. The task-server constraints arerepresented by a bipartite graph where vertices represent task types and servers, respectively. The analysis of these systems has historically relied heavily on mean-field analysis.A pivotal assumption for this framework is that servers are exchangeable. However, due tothe lack of exchangeability in the constrained system, mean-field techniques fundamentallybreak down. In this chapter, we develop a novel coupling-based approach to establish themean-field approximation for a large class of sparse graphs, including spatial graphs. Themethod extends the scope of mean-field analysis far beyond the classical full-flexibilitysetup.In Chapter 3, we consider a large-scale, parallel-server system with an unknown arrivalrate, where each server is able to adjust its processing speed. The objective is to minimize the system cost, which consists of a power cost to maintain the servers' processingspeed and a quality of service cost depending on the tasks' sojourn times. We draw onideas from stochastic approximation to design a novel speed scaling algorithm and provethat the server's processing speeds converge to the globally asymptotically optimum value.Curiously, the algorithm is fully distributed and does not require any communication between servers. Apart from the algorithm design, a key contribution of our approach lies indemonstrating how concepts from the stochastic approximation literature can be leveragedto effectively tackle learning problems in large-scale, distributed systems.In Chapter 4, we consider learning-augmented algorithms, where the decision makerhas access to a black-box oracle, such as a machine learning model, that provides untrustedand potentially inaccurate predictions of future inputs. The goal of the decision maker isto exploit the predictions if they are accurate, while guaranteeing performance that is notmuch worse than the hindsight optimal sequence of decisions, even when predictions areinaccurate. We consider two applications: capacity scaling and smoothed online optimization. For both applications, we design a novel algorithm and prove a competitive ratioguarantee as a function of the predictions' accuracy. Interestingly, we identify a fundamental trade-off between the worst-case (predictions are inaccurate) and best-case (predictionsare accurate). In fact, we prove that this trade-off is necessary for any algorithm.
일반주제명  
Sparsity
일반주제명  
Graphs
일반주제명  
Neural networks
일반주제명  
Decision making
일반주제명  
Stochastic models
일반주제명  
Ordinary differential equations
일반주제명  
Processing speed
일반주제명  
Mathematics
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)GeorgiaTech75185
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a330
■1001  ▼aRutten,  Daan.
■24510▼aCompatibility,  Predictions  and  Optimization  in  Large-Scale  Online  Decision  Making
■260    ▼a[Sl]▼bGeorgia  Institute  of  Technology▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a290  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Mukherjee,  Debankur.
■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2024.
■520    ▼aThe  last  few  years  have  seen  a  shift  in  server  architecture  towards  large-scale,  dedicateddata  centers.  The  massive  scale  of  these  datacenters  has  highlighted  important,  unsolvedproblems  in  the  space  of  load  balancing,  speed  scaling  and  related  areas  in  the  optimizationof  such  large-scale  service  systems.  Many  of  the  mathematical  problems  abstracted  fromthese  challenges  form  fundamental  problems  in  the  field  of  online  decision  making  andrequire  a  combination  of  tools  from  probability,  stochastic  processes  and  online  algorithmstogether  with  completely  new  insights  to  be  solvable.  This  thesis  broadly  addresses  threeof  these  problems,  as  detailed  below.In  Chapter  2,  we  consider  a  large-scale,  parallel-server  system,  where  tasks  of  a  particular  type  can  only  be  routed  to  a  small  subset  of  servers.  The  task-server  constraints  arerepresented  by  a  bipartite  graph  where  vertices  represent  task  types  and  servers,  respectively.  The  analysis  of  these  systems  has  historically  relied  heavily  on  mean-field  analysis.A  pivotal  assumption  for  this  framework  is  that  servers  are  exchangeable.  However,  due  tothe  lack  of  exchangeability  in  the  constrained  system,  mean-field  techniques  fundamentallybreak  down.  In  this  chapter,  we  develop  a  novel  coupling-based  approach  to  establish  themean-field  approximation  for  a  large  class  of  sparse  graphs,  including  spatial  graphs.  Themethod  extends  the  scope  of  mean-field  analysis  far  beyond  the  classical  full-flexibilitysetup.In  Chapter  3,  we  consider  a  large-scale,  parallel-server  system  with  an  unknown  arrivalrate,  where  each  server  is  able  to  adjust  its  processing  speed.  The  objective  is  to  minimize  the  system  cost,  which  consists  of  a  power  cost  to  maintain  the  servers'  processingspeed  and  a  quality  of  service  cost  depending  on  the  tasks'  sojourn  times.  We  draw  onideas  from  stochastic  approximation  to  design  a  novel  speed  scaling  algorithm  and  provethat  the  server's  processing  speeds  converge  to  the  globally  asymptotically  optimum  value.Curiously,  the  algorithm  is  fully  distributed  and  does  not  require  any  communication  between  servers.  Apart  from  the  algorithm  design,  a  key  contribution  of  our  approach  lies  indemonstrating  how  concepts  from  the  stochastic  approximation  literature  can  be  leveragedto  effectively  tackle  learning  problems  in  large-scale,  distributed  systems.In  Chapter  4,  we  consider  learning-augmented  algorithms,  where  the  decision  makerhas  access  to  a  black-box  oracle,  such  as  a  machine  learning  model,  that  provides  untrustedand  potentially  inaccurate  predictions  of  future  inputs.  The  goal  of  the  decision  maker  isto  exploit  the  predictions  if  they  are  accurate,  while  guaranteeing  performance  that  is  notmuch  worse  than  the  hindsight  optimal  sequence  of  decisions,  even  when  predictions  areinaccurate.  We  consider  two  applications:  capacity  scaling  and  smoothed  online  optimization.  For  both  applications,  we  design  a  novel  algorithm  and  prove  a  competitive  ratioguarantee  as  a  function  of  the  predictions'  accuracy.  Interestingly,  we  identify  a  fundamental  trade-off  between  the  worst-case  (predictions  are  inaccurate)  and  best-case  (predictionsare  accurate).  In  fact,  we  prove  that  this  trade-off  is  necessary  for  any  algorithm.
■590    ▼aSchool  code:  0078.
■650  4▼aSparsity
■650  4▼aGraphs
■650  4▼aNeural  networks
■650  4▼aDecision  making
■650  4▼aStochastic  models
■650  4▼aOrdinary  differential  equations
■650  4▼aProcessing  speed
■650  4▼aMathematics
■690    ▼a0800
■690    ▼a0405
■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0078
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360604▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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