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Tree-Based Models for Learning Complex Distributions
Tree-Based Models for Learning Complex Distributions
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202102953
- ISBN
- 9798315705444
- DDC
- 574
- 서명/저자
- Tree-Based Models for Learning Complex Distributions
- 발행사항
- [Sl] : The University of North Carolina at Chapel Hill, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 83 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Kosorok, Michael.
- 학위논문주기
- Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2024.
- 초록/해제
- 요약Tree-based models are some of the most successful machine learning models. Their simplicity makes them considerably faster to tune and more robust than deep learning, leading to their dominant performance on tabular datasets. We investigate the use of tree-based models on two problem types. The first is feature importance in nonlinear settings using Shapley values and Shapley-inspired methods. While model-based Shapley values might be accurate explainers of model predictions, machine learning models themselves are often poor explainers of the DGP even if the model is highly accurate. We introduce a novel metric, Shapley Marginal Surplus for Strong Models, that samples the space of possible models to come up with a truly explanatory measure of feature importance. We compare this method to other popular feature importance methods, both Shapley-based and non-Shapley based, and demonstrate significant outperformance relative to other methods. We also provide potential extensions using Bayesian optimization and online reinforcement learning to improve performance. The second problem is using a tree-based representation of a bargaining game to predict coalition formation in parliamentary governments. Represented as extensive form bargaining games, single trials of these games have orders of magnitude more states than existing game theory challenge problems such as poker. Using a heavily coarsened game tree and a novel constrained fictitious play algorithm for most of the actors in the model, we reduce these incalculably large game trees to manageable dimensions and then find optimal coalitions using Monte Carlo counterfactual regret (MCCFR) tree search.
- 일반주제명
- Biostatistics
- 일반주제명
- Computer engineering
- 키워드
- Shapley values
- 기타저자
- The University of North Carolina at Chapel Hill Biostatistics
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798315705444
■035 ▼a(MiAaPQ)AAI31767826
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼ade Marchi, Daniel.
■24510▼aTree-Based Models for Learning Complex Distributions
■260 ▼a[Sl]▼bThe University of North Carolina at Chapel Hill▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a83 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Kosorok, Michael.
■5021 ▼aThesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2024.
■520 ▼aTree-based models are some of the most successful machine learning models. Their simplicity makes them considerably faster to tune and more robust than deep learning, leading to their dominant performance on tabular datasets. We investigate the use of tree-based models on two problem types. The first is feature importance in nonlinear settings using Shapley values and Shapley-inspired methods. While model-based Shapley values might be accurate explainers of model predictions, machine learning models themselves are often poor explainers of the DGP even if the model is highly accurate. We introduce a novel metric, Shapley Marginal Surplus for Strong Models, that samples the space of possible models to come up with a truly explanatory measure of feature importance. We compare this method to other popular feature importance methods, both Shapley-based and non-Shapley based, and demonstrate significant outperformance relative to other methods. We also provide potential extensions using Bayesian optimization and online reinforcement learning to improve performance. The second problem is using a tree-based representation of a bargaining game to predict coalition formation in parliamentary governments. Represented as extensive form bargaining games, single trials of these games have orders of magnitude more states than existing game theory challenge problems such as poker. Using a heavily coarsened game tree and a novel constrained fictitious play algorithm for most of the actors in the model, we reduce these incalculably large game trees to manageable dimensions and then find optimal coalitions using Monte Carlo counterfactual regret (MCCFR) tree search.
■590 ▼aSchool code: 0153.
■650 4▼aBiostatistics
■650 4▼aComputer engineering
■653 ▼aMachine learning models
■653 ▼aShapley values
■653 ▼aOnline reinforcement learning
■690 ▼a0308
■690 ▼a0464
■690 ▼a0800
■71020▼aThe University of North Carolina at Chapel Hill▼bBiostatistics.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0153
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356563▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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