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Operator Learning for Scientific Computing
Operator Learning for Scientific Computing
Operator Learning for Scientific Computing

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자료유형  
 학위논문 서양
최종처리일시  
20260202105057
ISBN  
9798288818431
DDC  
515.35
저자명  
Trautner, Margaret K.
서명/저자  
Operator Learning for Scientific Computing
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
257 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Stuart, Andrew M.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약This thesis develops operator learning theory and methods for use in scientific computing. Operator learning uses data to approximate maps between infinite dimensional function spaces. As such, operator learning provides a natural framework for using machine learning in applications with partial differential equations (PDEs). While operator learning architectures have successfully modeled a variety of physical phenomena in practice, the theoretical foundations underpinning these successes remain in early stages of development.The present work takes a step towards a complete understanding of operator learning and its potential use in scientific applications. The thesis begins by studying multiscale constitutive modeling, where operator learning models can serve as surrogates to accelerate simulation and aid in model discovery of physical laws. The work proposes, and theoretically and numerically analyzes, an operator learning architecture for modeling history dependence in homogenized constitutive equations. The thesis then addresses learning solutions to an elliptic PDE in the presence of discontinuities and corner interfaces in two-dimensional materials. By proving a key continuity result for the underlying PDE, a universal approximation result is obtained. In its second half, the thesis moves on from the setting of homogenized constitutive laws and gives insight to operator learning from a broader perspective. First, error analysis bounds a form of discretization error that arises in implementations of the Fourier Neural Operator (FNO). Next, a modified form of the FNO, the Fourier Neural Mapping, accommodates finite-dimensional data while retaining the underlying function space structure. This modification allows applications where the map of interest is governed by an infinite-dimensional operator with data, such as parameters or summary statistics, in the form of finite vectors. Finally, the thesis extends a theory-to-practice gap result in finite dimensions to the infinite-dimensional operator learning setting, asserting that even for classes of architectures whose model expressivity scales well with model size, their error convergence with respect to data size scales poorly. In summary, this thesis builds understanding of operator learning from several perspectives and contributes both theoretical advancements and practical methodologies that improve the applicability of operator learning models to scientific problems.
일반주제명  
Partial differential equations
일반주제명  
Visualization
일반주제명  
Neural networks
일반주제명  
Computer science
기타저자  
California Institute of Technology Engineering and Applied Science
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a515.35
■1001  ▼aTrautner,  Margaret  K.▼0(orcid)000-0001-9937-8393
■24510▼aOperator  Learning  for  Scientific  Computing
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a257  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Stuart,  Andrew  M.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aThis  thesis  develops  operator  learning  theory  and  methods  for  use  in  scientific  computing.  Operator  learning  uses  data  to  approximate  maps  between  infinite  dimensional  function  spaces.  As  such,  operator  learning  provides  a  natural  framework  for  using  machine  learning  in  applications  with  partial  differential  equations  (PDEs).  While  operator  learning  architectures  have  successfully  modeled  a  variety  of  physical  phenomena  in  practice,  the  theoretical  foundations  underpinning  these  successes  remain  in  early  stages  of  development.The  present  work  takes  a  step  towards  a  complete  understanding  of  operator  learning  and  its  potential  use  in  scientific  applications.  The  thesis  begins  by  studying  multiscale  constitutive  modeling,  where  operator  learning  models  can  serve  as  surrogates  to  accelerate  simulation  and  aid  in  model  discovery  of  physical  laws.  The  work  proposes,  and  theoretically  and  numerically  analyzes,  an  operator  learning  architecture  for  modeling  history  dependence  in  homogenized  constitutive  equations.  The  thesis  then  addresses  learning  solutions  to  an  elliptic  PDE  in  the  presence  of  discontinuities  and  corner  interfaces  in  two-dimensional  materials.  By  proving  a  key  continuity  result  for  the  underlying  PDE,  a  universal  approximation  result  is  obtained.  In  its  second  half,  the  thesis  moves  on  from  the  setting  of  homogenized  constitutive  laws  and  gives  insight  to  operator  learning  from  a  broader  perspective.  First,  error  analysis  bounds  a  form  of  discretization  error  that  arises  in  implementations  of  the  Fourier  Neural  Operator  (FNO).  Next,  a  modified  form  of  the  FNO,  the  Fourier  Neural  Mapping,  accommodates  finite-dimensional  data  while  retaining  the  underlying  function  space  structure.  This  modification  allows  applications  where  the  map  of  interest  is  governed  by  an  infinite-dimensional  operator  with  data,  such  as  parameters  or  summary  statistics,  in  the  form  of  finite  vectors.  Finally,  the  thesis  extends  a  theory-to-practice  gap  result  in  finite  dimensions  to  the  infinite-dimensional  operator  learning  setting,  asserting  that  even  for  classes  of  architectures  whose  model  expressivity  scales  well  with  model  size,  their  error  convergence  with  respect  to  data  size  scales  poorly.  In  summary,  this  thesis  builds  understanding  of  operator  learning  from  several  perspectives  and  contributes  both  theoretical  advancements  and  practical  methodologies  that  improve  the  applicability  of  operator  learning  models  to  scientific  problems.
■590    ▼aSchool  code:  0037.
■650  4▼aPartial  differential  equations
■650  4▼aVisualization
■650  4▼aNeural  networks
■650  4▼aComputer  science
■690    ▼a0984
■690    ▼a0800
■71020▼aCalifornia  Institute  of  Technology▼bEngineering  and  Applied  Science.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359297▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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