pith. sign in

arxiv: 2606.30136 · v1 · pith:XG2NULAYnew · submitted 2026-06-29 · 💻 cs.LG · cs.GT

Robust Strategic Classification under Decision-Dependent Cost Uncertainty

Pith reviewed 2026-06-30 06:52 UTC · model grok-4.3

classification 💻 cs.LG cs.GT
keywords strategic classificationrobust optimizationdecision-dependent uncertaintyalgorithmic gamingcost evolutiontwo-stage modelsmachine learning
0
0 comments X

The pith

Accounting for how past decisions change future manipulation costs lets classifiers reduce uncertainty and limit gaming over time.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper develops a framework for strategic classification that treats the cost of gaming an algorithm as something that changes based on previous decisions. Existing approaches assume fixed costs, but in practice those costs evolve with the classifier's choices. The authors introduce a two-stage robust optimization model with a decision-dependent uncertainty set to capture the link between today's outcome and tomorrow's manipulation expense. If correct, this lets designers build systems that not only handle current strategic behavior but also discourage it in future rounds. A reader should care because real algorithmic systems operate over time, and ignoring cost evolution can leave them vulnerable to increasing manipulation.

Core claim

The paper proposes and analyzes a two-stage robust optimization framework with a decision-dependent uncertainty set to capture dependencies where manipulation costs evolve based on past algorithmic decisions. It highlights that awareness of policy-dependent costs not only reduces uncertainty, but also better curtails gaming of the algorithmic system over time.

What carries the argument

A decision-dependent uncertainty set in a two-stage robust optimization model that links past decisions to future manipulation costs.

If this is right

  • Classifiers using this approach achieve lower long-term costs from strategic behavior compared to static models.
  • The model produces decisions that anticipate and reduce future gaming incentives.
  • Uncertainty about costs shrinks when the dependence on policy history is explicitly modeled.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same structure could extend to other sequential decision problems such as dynamic pricing where user responses change over time.
  • It points to the value of collecting historical data on how decisions alter user effort in real deployments.
  • Iterative retraining under this framework might converge to policies with less total manipulation than myopic designs.

Load-bearing premise

The dependence between past decisions and future manipulation costs can be faithfully represented by a decision-dependent uncertainty set within a two-stage robust optimization model.

What would settle it

A multi-period simulation or dataset where manipulation costs show no dependence on prior decisions, resulting in the new framework performing no better than or worse than fixed-cost models.

Figures

Figures reproduced from arXiv: 2606.30136 by G\"uzin Bayraksan, Parinaz Naghizadeh, Sura Alhanouti.

Figure 1
Figure 1. Figure 1: Uncertainty sets Ω(β DD) vs. Ω(β DI). Our findings verify that the DD classifier adjusts manipulation costs in the second stage in a manner that improves accuracy rel￾ative to its DI counterpart. Specifically, as shown in [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: University admission features distribution Here, θ represents a plausible qualification threshold. In practice, most highly selective universities admit students with SAT scores near the 75th percentile or higher (Crimson Education, 2025). For extracurricular activities (ECs), we adopt a benchmark of 4–5 activities. This choice is motivated by evidence that the Common App allows up to 8–10 activities, and … view at source ↗
Figure 3
Figure 3. Figure 3: Second-stage decision-dependent uncertainty sets under off-diagonal cost matrices [PITH_FULL_IMAGE:figures/full_fig_p025_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of 3-dimensional projections of the 10-dimensional uncertainty sets Ω(β DD) and Ω(β DI) [PITH_FULL_IMAGE:figures/full_fig_p026_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Performance Comparison: True dependence aware (DD-True) and our dependence aware (DD-App). E.5. Impacts of approximations on reducing uncertainty and curbing manipulations The optimality gap analysis focused on differences in the overall objective function. Here, we further highlight how our approximate classifier fares against the optimal solution in terms of reducing uncertainty and curbing manipulations… view at source ↗
Figure 6
Figure 6. Figure 6: Comparison of uncertainty sets Ω(β DD True) and Ω(β DD App). This observation is consistent with the stricter uncertainty set for the DD-True classifier illustrated in [PITH_FULL_IMAGE:figures/full_fig_p027_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Second-stage decision-dependent uncertainty sets. Thus, it both limits the reduction in second-stage costs and ensures manipulation remains consistently expensive. In contrast, [PITH_FULL_IMAGE:figures/full_fig_p029_7.png] view at source ↗
read the original abstract

Humans facing algorithmic decision systems have been found to ``game'' them by altering their input data (at a cost to them) in order to favorably change the algorithmic outcomes they receive (at a cost to the algorithm). The growing literature on strategic classification seeks to develop robust machine learning algorithms that account for, and reduce, unwanted strategic behavior. A limitation of these existing works is that they assume the cost of strategic behavior to be fixed and independent of the classifier's decision. In practice, however, manipulation costs evolve and depend on past algorithmic decisions: today's decisions influence tomorrow's costs. This paper proposes and analyzes a two-stage robust optimization framework with a decision-dependent uncertainty set to capture such dependencies. We highlight that awareness of policy-dependent costs not only reduces uncertainty, but also better curtails gaming of the algorithmic system over time.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The paper identifies a limitation in strategic classification literature: existing models assume fixed, decision-independent manipulation costs. It proposes a two-stage robust optimization framework that incorporates a decision-dependent uncertainty set to capture how past algorithmic decisions affect future manipulation costs. The central claim is that awareness of these policy-dependent costs reduces uncertainty and more effectively curtails gaming behavior over time.

Significance. If the modeling choice is shown to faithfully represent observable cost evolution and the resulting optimization yields measurable improvements, the work could strengthen long-term robustness guarantees in deployed strategic classifiers. The two-stage structure with endogenous uncertainty is a natural extension of prior robust strategic classification, but its value hinges on validation of the dependence structure.

major comments (2)
  1. [Abstract] Abstract, paragraph 3: the claim that the decision-dependent uncertainty set 'captures such dependencies' is load-bearing for both the uncertainty-reduction and gaming-curtailment assertions, yet the manuscript supplies neither the explicit functional form of the set nor a theoretical or empirical argument establishing that the parametrization tracks real cost evolution induced by past decisions.
  2. [Abstract] Abstract, paragraph 3: the two-stage robust optimization model is presented as solving the problem, but without any derivation, algorithm, or experiment in the supplied text it is impossible to verify whether the framework actually supports the stated claim that policy-dependent costs 'better curtails gaming of the algorithmic system over time.'

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on the abstract. The comments correctly note that the abstract makes strong claims in a concise format. We will revise the abstract to better signpost the supporting material in the body of the paper while preserving its summary nature. Point-by-point responses appear below.

read point-by-point responses
  1. Referee: [Abstract] Abstract, paragraph 3: the claim that the decision-dependent uncertainty set 'captures such dependencies' is load-bearing for both the uncertainty-reduction and gaming-curtailment assertions, yet the manuscript supplies neither the explicit functional form of the set nor a theoretical or empirical argument establishing that the parametrization tracks real cost evolution induced by past decisions.

    Authors: The explicit functional form appears in Section 3.1 (Definition 1), where the decision-dependent uncertainty set is defined as U(θ, x) = {u : ||u|| ≤ ho(θ, x)} with ρ explicitly depending on the prior decision θ. The argument that this form tracks cost evolution induced by past decisions is given in Section 4.1 (Proposition 1 and its proof), which shows contraction of the set under a Lipschitz condition on the cost function. No empirical validation on real-world cost trajectories is provided; the analysis remains theoretical. We will revise the abstract to reference these sections and slightly temper the claim to 'models such dependencies' rather than 'captures such dependencies.' revision: yes

  2. Referee: [Abstract] Abstract, paragraph 3: the two-stage robust optimization model is presented as solving the problem, but without any derivation, algorithm, or experiment in the supplied text it is impossible to verify whether the framework actually supports the stated claim that policy-dependent costs 'better curtails gaming of the algorithmic system over time.'

    Authors: The two-stage formulation, its derivation from the standard robust strategic classification problem, and the solution algorithm are derived in Section 3.2 and presented as Algorithm 1. Section 5 contains synthetic experiments comparing gaming reduction under decision-dependent versus decision-independent uncertainty sets. We will revise the abstract to include a short clause directing readers to these sections for the derivation and numerical results. revision: yes

Circularity Check

0 steps flagged

No significant circularity; proposal is an independent modeling choice

full rationale

The paper proposes a two-stage robust optimization model with a decision-dependent uncertainty set to capture how past decisions affect future manipulation costs. No equations, fitted parameters, or self-citations appear in the abstract or description that reduce any claimed prediction or result to the inputs by construction. The framework is introduced as a new modeling device rather than a re-expression of prior fitted quantities or a self-referential definition. The central claim therefore rests on an external modeling assumption whose validity is independent of the paper's own derivations.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central modeling step rests on the domain assumption that manipulation costs evolve deterministically with past decisions and that this evolution can be captured inside a robust-optimization uncertainty set; no free parameters or invented entities are visible in the abstract.

axioms (1)
  • domain assumption Manipulation costs depend on past algorithmic decisions
    Explicitly stated as the key limitation of existing work that the new framework addresses.

pith-pipeline@v0.9.1-grok · 5675 in / 1203 out tokens · 30382 ms · 2026-06-30T06:52:00.133216+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

85 extracted references · 6 canonical work pages

  1. [1]

    Operations Research Letters , volume=

    An inexact column-and-constraint generation method to solve two-stage robust optimization problems , author=. Operations Research Letters , volume=. 2023 , publisher=

  2. [2]

    SIAM Journal on Optimization , volume=

    Approximation Guarantees for Min-Max-Min Robust Optimization and-Adaptability Under Objective Uncertainty , author=. SIAM Journal on Optimization , volume=. 2024 , publisher=

  3. [3]

    SIAM Journal on Optimization , volume=

    Robust optimization with continuous decision-dependent uncertainty with applications to demand response management , author=. SIAM Journal on Optimization , volume=. 2023 , publisher=

  4. [4]

    Operations Research Letters , volume=

    Uncertainty reduction in robust optimization , author=. Operations Research Letters , volume=. 2024 , publisher=

  5. [5]

    Open Journal of Mathematical Optimization , volume=

    Combinatorial robust optimization with decision-dependent information discovery and polyhedral uncertainty , author=. Open Journal of Mathematical Optimization , volume=

  6. [6]

    Proceedings of the 2025 International Conference on Machine Learning , year=

    Learning Classifiers That Induce Markets , author=. Proceedings of the 2025 International Conference on Machine Learning , year=

  7. [7]

    Proceedings of the 13th International Conference on Learning Representations , year=

    Strategic Classification With Externalities , author=. Proceedings of the 13th International Conference on Learning Representations , year=

  8. [8]

    Management Science , volume=

    Optimal decision making under strategic behavior , author=. Management Science , volume=. 2024 , publisher=

  9. [9]

    IEEE/CAA Journal of Automatica Sinica , volume=

    Two-stage robust optimization under decision dependent uncertainty , author=. IEEE/CAA Journal of Automatica Sinica , volume=. 2022 , publisher=

  10. [10]

    Journal of Modern Power Systems and Clean Energy , volume=

    Two-stage robust optimization for assessment of PV hosting capacity based on decision-dependent uncertainty , author=. Journal of Modern Power Systems and Clean Energy , volume=. 2024 , publisher=

  11. [11]

    IEEE Transactions on Power Systems , volume=

    Robust generation dispatch with strategic renewable power curtailment and decision-dependent uncertainty , author=. IEEE Transactions on Power Systems , volume=. 2022 , publisher=

  12. [12]

    2006 , url=

    Matt McGann , title=. 2006 , url=

  13. [13]

    Advances in neural information processing systems , volume=

    Robust multi-agent reinforcement learning with model uncertainty , author=. Advances in neural information processing systems , volume=

  14. [14]

    arXiv preprint arXiv:2007.10457 , year=

    Multi-agent reinforcement learning in bayesian stackelberg markov games for adaptive moving target defense , author=. arXiv preprint arXiv:2007.10457 , year=

  15. [15]

    Advances in neural information processing systems , volume=

    Combining deep reinforcement learning and search for imperfect-information games , author=. Advances in neural information processing systems , volume=

  16. [16]

    Proceedings of the 42nd International Conference on Machine Learning , year=

    Breaking the Curse of Multiagency in Robust Multi-Agent Reinforcement Learning , author=. Proceedings of the 42nd International Conference on Machine Learning , year=

  17. [17]

    Turning the Tide: Inspiring Concern for Others and the Common Good through College Admissions , year =

  18. [18]

    Trachtenberg and N

    Strategic Classification with Non-Linear Classifiers , author=. arXiv preprint arXiv:2505.23443 , year=

  19. [19]

    2023 , url =

    Laura Spitalniak , title =. 2023 , url =

  20. [20]

    Economics of Education Review , volume=

    The impact of college admissions policies on the academic effort of high school students , author=. Economics of Education Review , volume=. 2018 , publisher=

  21. [21]

    2025 , url =

    Anna Petrosino , title =. 2025 , url =

  22. [22]

    2022 , url =

    Halle Edwards , title =. 2022 , url =

  23. [23]

    2024 , url =

    David Deming , title =. 2024 , url =

  24. [24]

    2003 , publisher=

    Catching cheating teachers: The results of an unusual experiment in implementing theory , author=. 2003 , publisher=

  25. [25]

    Proceedings of the 23rd ACM Conference on Economics and Computation , pages=

    Adjustment of Bidding Strategies After a Switch to First-Price Rules , author=. Proceedings of the 23rd ACM Conference on Economics and Computation , pages=

  26. [26]

    International Conference on Machine Learning , pages=

    Generalized strategic classification and the case of aligned incentives , author=. International Conference on Machine Learning , pages=. 2022 , organization=

  27. [27]

    arXiv preprint arXiv:2503.07324 , year=

    Decision-Dependent Stochastic Optimization: The Role of Distribution Dynamics , author=. arXiv preprint arXiv:2503.07324 , year=

  28. [28]

    arXiv preprint arXiv:2203.16484 , year=

    Two-stage robust optimization with decision dependent uncertainty , author=. arXiv preprint arXiv:2203.16484 , year=

  29. [29]

    The IEEE Control and Decisions Conference (CDC) , year=

    Could anticipating gaming incentivize improvement in (fair) strategic classification , author=. The IEEE Control and Decisions Conference (CDC) , year=

  30. [30]

    Journal of Machine Learning Research , volume=

    Regularization via mass transportation , author=. Journal of Machine Learning Research , volume=

  31. [31]

    Proceedings of the 40th International Conference on Machine Learning , pages=

    Strategic classification with unknown user manipulations , author=. Proceedings of the 40th International Conference on Machine Learning , pages=. 2023 , organization=

  32. [32]

    Geary and H

    Strategic Classification with Randomised Classifiers , author=. arXiv preprint arXiv:2502.01313 , year=

  33. [33]

    The Thirty Seventh Annual Conference on Learning Theory , pages=

    Learnability gaps of strategic classification , author=. The Thirty Seventh Annual Conference on Learning Theory , pages=. 2024 , organization=

  34. [34]

    Proceedings of the Twenty-Ninth International Conference on International Joint Conferences on Artificial Intelligence , pages=

    Maximizing welfare with incentive-aware evaluation mechanisms , author=. Proceedings of the Twenty-Ninth International Conference on International Joint Conferences on Artificial Intelligence , pages=

  35. [35]

    Proceedings of the Conference on Fairness, Accountability, and Transparency , pages=

    The Social Cost of Strategic Classification , author=. Proceedings of the Conference on Fairness, Accountability, and Transparency , pages=

  36. [36]

    Management Science , volume=

    Algorithmic Transparency with Strategic Users , author=. Management Science , volume=. 2023 , doi=

  37. [37]

    International Conference on Artificial Intelligence and Statistics , pages=

    Linear models are robust optimal under strategic behavior , author=. International Conference on Artificial Intelligence and Statistics , pages=. 2021 , organization=

  38. [38]

    International Conference on Artificial Intelligence and Statistics , pages=

    Gaming helps! learning from strategic interactions in natural dynamics , author=. International Conference on Artificial Intelligence and Statistics , pages=. 2021 , organization=

  39. [39]

    Proceedings of the 39th Conference on Neural Information Processing Systems , year=

    Incentivizing desirable effort profiles in strategic classification: The role of causality and uncertainty , author=. Proceedings of the 39th Conference on Neural Information Processing Systems , year=

  40. [40]

    Advances in Neural Information Processing Systems , volume=

    Bayesian strategic classification , author=. Advances in Neural Information Processing Systems , volume=

  41. [41]

    Proceedings of the 22nd ACM Conference on Economics and Computation , pages=

    The strategic perceptron , author=. Proceedings of the 22nd ACM Conference on Economics and Computation , pages=

  42. [42]

    Proceedings of the AAAI Conference on Artificial Intelligence , pages=

    Learning Losses for Strategic Classification , author=. Proceedings of the AAAI Conference on Artificial Intelligence , pages=

  43. [43]

    International Conference on Machine Learning , year=

    Information Discrepancy in Strategic Learning , author=. International Conference on Machine Learning , year=

  44. [44]

    International Conference on Machine Learning , pages=

    Strategic classification in the dark , author=. International Conference on Machine Learning , pages=. 2021 , organization=

  45. [45]

    Advances in Neural Information Processing Systems , volume=

    Bayesian persuasion for algorithmic recourse , author=. Advances in Neural Information Processing Systems , volume=

  46. [46]

    Proceedings of the 41st International Conference on Machine Learning , pages=

    One-shot strategic classification under unknown costs , author=. Proceedings of the 41st International Conference on Machine Learning , pages=

  47. [47]

    1st Symposium on Foundations of Responsible Computing (FORC 2020) , volume=

    The Role of Randomness and Noise in Strategic Classification , author=. 1st Symposium on Foundations of Responsible Computing (FORC 2020) , volume=

  48. [48]

    Proceedings of the 2018 ACM Conference on Economics and Computation , pages=

    Strategic classification from revealed preferences , author=. Proceedings of the 2018 ACM Conference on Economics and Computation , pages=

  49. [49]

    Journal of Machine Learning Research , volume=

    Pac-learning for strategic classification , author=. Journal of Machine Learning Research , volume=

  50. [50]

    Advances in Neural Information Processing Systems , volume=

    Strategic classification under unknown personalized manipulation , author=. Advances in Neural Information Processing Systems , volume=

  51. [51]

    Advances in Neural Information Processing Systems , year=

    Stateful Strategic Regression , author=. Advances in Neural Information Processing Systems , year=

  52. [52]

    International Conference on Machine Learning , pages=

    Causal strategic classification: A tale of two shifts , author=. International Conference on Machine Learning , pages=. 2023 , organization=

  53. [53]

    Advances in Neural Information Processing Systems , volume=

    Calibrated stackelberg games: Learning optimal commitments against calibrated agents , author=. Advances in Neural Information Processing Systems , volume=

  54. [54]

    Proceedings of the 2025 ACM Conference on Fairness, Accountability, and Transparency , pages=

    The double-edged sword of behavioral responses in strategic classification: Theory and user studies , author=. Proceedings of the 2025 ACM Conference on Fairness, Accountability, and Transparency , pages=

  55. [55]

    62nd IEEE Conference on Decision and Control (CDC) , year=

    Collaboration as a Mechanism for More Robust Strategic Classification , author=. 62nd IEEE Conference on Decision and Control (CDC) , year=

  56. [56]

    Proceedings of the 2016 ACM Conference on Innovations in Theoretical Computer Science , pages=

    Strategic Classification , author=. Proceedings of the 2016 ACM Conference on Innovations in Theoretical Computer Science , pages=

  57. [57]

    Mathematical Programming , volume=

    A polyhedral branch-and-cut approach to global optimization , author=. Mathematical Programming , volume=. 2005 , publisher=

  58. [58]

    Mathematical Programming , volume=

    Computability of global solutions to factorable nonconvex programs: Part I—Convex underestimating problems , author=. Mathematical Programming , volume=. 1976 , publisher=

  59. [59]

    Mathematical Programming , volume=

    A reformulation-linearization technique for optimization over simplices , author=. Mathematical Programming , volume=. 2023 , publisher=

  60. [60]

    Available at Optimization Online , year=

    An extension of the reformulation-linearization technique to nonlinear optimization , author=. Available at Optimization Online , year=

  61. [61]

    International Conference on Learning Representations , year=

    Learning with Feature-Dependent Label Noise: A Progressive Approach , author=. International Conference on Learning Representations , year=

  62. [62]

    Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision , pages=

    Bootstrapping the relationship between images and their clean and noisy labels , author=. Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision , pages=

  63. [63]

    Proceedings of the International Conference on Information Systems , year=

    Hands on the Wheel: Navigating Algorithmic Management and Uber Drivers’ , author=. Proceedings of the International Conference on Information Systems , year=

  64. [64]

    2017 , note =

    Paul Solman , title =. 2017 , note =

  65. [65]

    2024 , note =

    Christopher Maag , title =. 2024 , note =

  66. [66]

    2025 , note =

    Priyanjana Pramanik , title =. 2025 , note =

  67. [67]

    2022 , howpublished =

    Ashley Stahl , title =. 2022 , howpublished =

  68. [68]

    2024 , howpublished =

    Haleluya Hadero , title =. 2024 , howpublished =

  69. [69]

    Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems , year=

    First I "Like" It, Then I Hide It: Folk Theories of Social Feeds , author=. Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems , year=

  70. [70]

    Proceedings of the Conference on Fairness, Accountability, and Transparency , pages=

    The Disparate Effects of Strategic Manipulation , author=. Proceedings of the Conference on Fairness, Accountability, and Transparency , pages=

  71. [71]

    Proceedings of the 37th International Conference on Machine Learning , year=

    Strategic Classification is Causal Modeling in Disguise , author=. Proceedings of the 37th International Conference on Machine Learning , year=

  72. [72]

    ACM Transactions on Economics and Computation (TEAC) , year=

    How Do Classifiers Induce Agents to Invest Effort Strategically? , author=. ACM Transactions on Economics and Computation (TEAC) , year=

  73. [73]

    SAT Suite Data and Reports Archive , year =

  74. [74]

    American Educational Research Journal , volume=

    Inequality beyond standardized tests: Trends in extracurricular activity reporting in college applications across race and class , author=. American Educational Research Journal , volume=. 2025 , publisher=

  75. [75]

    Advances in neural information processing systems , volume=

    Equality of opportunity in supervised learning , author=. Advances in neural information processing systems , volume=

  76. [76]

    Transactions on Machine Learning Research , volume=

    Learning under Imitative Strategic Behavior with Unforeseeable Outcomes , author=. Transactions on Machine Learning Research , volume=. 2024 , publisher=

  77. [77]

    International Conference on Machine Learning , pages=

    Fairness interventions as (dis) incentives for strategic manipulation , author=. International Conference on Machine Learning , pages=. 2022 , organization=

  78. [78]

    What Is a Good SAT Score for Top Universities in 2025? , year =

  79. [79]

    Factors in the Admission Decision , year =

  80. [80]

    2025 , howpublished =

    Jon Solomon , title =. 2025 , howpublished =

Showing first 80 references.