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Advancing Frontiers of Path Integral Theory for Stochastic Optimal Control

T0 review · 3 major / 4 minor · reviewed 2026-08-16 · deepseek-v4-flash

Pith's one-line read The dissertation's central claim is that a chance-constrained stochastic optimal control problem can be solved with zero duality gap by dual ascent whose gradient is a Monte Carlo estimate of failure probability, and that the same path…

desk verdict A competent compilation of already-published path integral control results, with one genuinely interesting chance-constrained duality claim that hinges on an assumption the dissertation itself labels a conjecture. read the letter →

arxiv 2504.17154 v1 pith:WLT6CDSY submitted 2025-04-24 math.OC cs.ROcs.SYeess.SY

classification math.OCcs.ROcs.SYeess.SY MSC 49K4549L2549N1560H3093E2093E25
keywords pathintegralcontrolchance-constrainedstochasticoptimalstrongdualityFeynman-KacrepresentationMonteCarlodualascentzero-sumdifferentialgamesdeceptivesamplecomplexity
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This dissertation extends path integral control—a Monte Carlo method that turns stochastic optimal control into averages over simulated trajectories—to six problem classes that previously resisted sampling-based treatment. Its central result is that a chance-constrained stochastic optimal control problem, where a collision or failure probability must stay below a given threshold, can be solved through its Lagrangian dual with zero duality gap. That means the hard constraint can be handled by iteratively updating a single penalty weight using Monte Carlo estimates of failure probability, instead of solving a high-dimensional PDE on a grid. The same path integral machinery is then carried over to two-player zero-sum games, deceptive policy synthesis, hierarchical task control, and stealthy attack synthesis and mitigation. If the zero-duality-gap theorem holds, safety-critical control becomes a simulator-driven, GPU-parallelizable computation.

What carries the argument

The load-bearing object is the Feynman-Kac representation of the exponentiated value function, $\xi(x,t;\eta) = \mathbb{E}\left[\exp\left(-\frac{1}{\lambda}\left(\phi(\hat{x}(\hat{t}_f);\eta) + \int_{t}^{\hat{t}_f} V(\hat{x}(r),r)\,dr\right)\right)\right]$, where the expectation is over trajectories of the uncontrolled system and $\phi$ encodes the terminal cost plus the chance-constraint penalty $\eta \cdot \mathbf{1}_{x(t_f)\in\partial X_s}$. With the noise-control alignment condition $\Sigma\Sigma^\top = \lambda G R^{-1} G^\top$, this linearizes the HJB equation. The optimal control is $u^*(x,t;\eta) = -R^{-1}G^\top \partial_x J(x,t;\eta)$ with $J = -\lambda \log \xi$, and the failure probability is estimated by reweighting uncontrolled sample paths by the same exponentiated cost, an importance-sampling step. Dual ascent on $\eta$ uses that estimated failure probability as the gradient.

What would settle it

Take a simple two-dimensional robot navigation model satisfying Assumptions 1 and 2, compute $u^*(\cdot;\eta)$ and its Monte Carlo failure probability over a fine grid of $\eta$ values, and look for a jump discontinuity in $\eta \mapsto P_{\mathrm{fail}}(x_0,t_0,u^*(\cdot;\eta))$; such a discontinuity would break the complementary-slackness step and could make dual ascent terminate at an infeasible or suboptimal policy.

Watch

Extended reading notes

Core claim

The paper's main claim is Theorem 3: for a control-affine stochastic system whose noise enters through the control channels, if the chance-constrained problem is strictly feasible and the map from the penalty weight $\eta$ to the failure probability of the resulting optimal policy is continuous, then the dual optimum equals the primal optimum. The optimal policy of the soft-constrained dual problem at the right $\eta^*$ is optimal for the original chance-constrained problem. Because the dual objective is evaluated by Feynman-Kac expectations over uncontrolled trajectories and the failure probability by importance sampling, the whole loop—update $\eta$, resample, recompute the policy—can run online. The dissertation also claims analogous path integral solutions for saddle-point policies in zero-sum stochastic differential games, KL-divergence-minimizing deceptive policies, task hierarchies combining simple and optimal controllers, and risk mitigation of stealthy attacks, plus a sample-complexity bound for discrete-time LQR.

Load-bearing premise

The load-bearing premise is that the failure probability of the optimal policy, viewed as a function of the penalty weight $\eta$, is continuous; the paper labels this assumption a conjecture and defers its proof.

Editorial extensions

If this is right

  • Chance-constrained motion planning in four- and five-dimensional robot models can be solved online with Monte Carlo rollouts, where grid-based PDE solvers become impractical.
  • Saddle-point policies for zero-sum stochastic differential games, including disturbance attenuation and pursuit-evasion, can be computed by the same uncontrolled-trajectory expectations without offline training.
  • A deceptive agent can hide deviations from a supervisor by sampling control actions proportional to exponentiated path costs under the reference policy; as the number of samples grows, the sampled actions converge to the optimal deceptive distribution.
  • Null-space projection lets a robot execute simple PD-controlled tasks and a path integral-controlled task simultaneously, avoiding local minima that pure PD hierarchies exhibit.
  • For discrete-time stochastic LQR, the required number of Monte Carlo samples grows logarithmically in the control-input dimension, in contrast to the exponential growth of exact dynamic programming.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the continuity assumption behind Theorem 3 holds broadly, the dual-ascent loop becomes a general-purpose safety-constrained solver: hard failure-probability constraints reduce to a one-dimensional search over $\eta$, and the same estimator could be reused for chance-constrained games, which the paper lists as future work.
  • The continuity conjecture might be provable from stability of Dirichlet boundary-value problems: if the boundary data $\phi(\cdot;\eta)$ depends continuously on $\eta$ and the linearized PDE has a stable solution, then $P_{\mathrm{fail}}$ would inherit that continuity; a counterexample would require a genuine phase transition in exit probabilities.
  • The importance-sampling estimator for $P_{\mathrm{fail}}$ doubles as a stochastic gradient of the dual function, so variance-reduction techniques could yield stronger convergence guarantees for dual ascent than the paper's fixed-step-size update.
  • Because the Bretagnolle-Huber inequality is distribution-free, the deception and stealthy-attack results suggest a general template: any task cost can be made stealthy by exponential reweighting under a nominal policy, connecting path integral control to hypothesis testing in continuous spaces.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The dissertation develops sampling-based ('path integral') methods for six classes of stochastic optimal control problems. Chapter 2 formulates a continuous-time chance-constrained SOC problem, derives a Lagrangian dual whose inner subproblem is an HJB PDE, linearizes the PDE under Assumption 1 (ΣΣᵀ = λ G R⁻¹ Gᵀ), and proposes a Monte Carlo dual-ascent algorithm (Algorithm 1). The central theoretical claim is Theorem 3: under Assumptions 1–3, the duality gap is zero and the dual-ascent policy u*(·;η*) is primal optimal. Chapter 3 extends the framework to two-player zero-sum differential games with a risk-minimizing cost, deriving saddle-point policies from an HJI PDE under Assumption 4. Chapter 4 combines null-space projection with path integral control for hierarchical task control. Chapter 5 formulates deceptive control as a KL-control problem and proposes a weighted-sampling algorithm under deterministic state dynamics. Chapter 6 applies the framework to stealthy attack synthesis and mitigation, and Chapter 7 is announced as a discrete-time LQR treatment with sample complexity analysis but is not present in the submitted text.

Significance. If the assumptions that the central results require are supplied, the chance-constrained result would be a substantial contribution: it offers a sampler-only alternative to grid-based PDE methods for a non-convex constrained problem, is supported by an open-source implementation, and is demonstrated on 4D and 5D systems where finite differences are impractical. The game-theoretic, hierarchical, and deception chapters also translate known linearizability conditions into concrete Monte Carlo algorithms, and the derivations are largely self-contained, starting from the HJB/HJI PDE and the Feynman-Kac representation rather than fitting constants to target outcomes. The main advertised claim, however, is explicitly conditional on a continuity assumption that the manuscript itself labels a conjecture, and two of the core proofs are either deferred to an unavailable appendix or omitted for brevity.

major comments (3)
  1. [§2.6.2 (Assumption 3; Theorem 3)] The zero-duality-gap claim is conditional on an unproved continuity assumption that the manuscript itself labels a conjecture and defers to future work (§2.9). This is not a routine regularity check: η enters the boundary data of the dual HJB PDE, and Pfail is an exit probability of the resulting diffusion. If η ↦ Pfail(x0,t0,u*(·;η)) has a jump, the complementary slackness statements (a)–(b) need not hold, and Algorithm 1 could terminate at a policy that is either infeasible or suboptimal. Since Theorem 3 is the main advertised contribution, the proof of Assumption 3 must be supplied, or the theorem must be explicitly stated as conditional. The proof of Theorem 3 is also deferred to Lemma 4 in Appendix A.1, and the appendix content is not included in the submitted text, so the argument cannot be checked.
  2. [§2.5.2 footnote; Theorem 2] The exact indicator terminal cost φ(x;η) = ψ(x)1_{x∈Xs} + η1_{x∈∂Xs} − ηΔ is approximated by a smooth bump function for PDE regularity, yet Theorem 2 asserts existence and uniqueness of the value function for the exact problem, and Theorems 1–3 are stated for the exact indicator. The manuscript does not state regularity conditions under which the linearized PDE has a classical solution for the discontinuous indicator data, nor does it explain how the bump approximation affects the chance constraint or the duality gap. This matters because Algorithm 1 estimates Pfail using the exact indicator, so the theory must be reconciled with the numerical object being evaluated.
  3. [§3.4.2 (Theorem 8)] The proof of Theorem 8 does not contain the derivation of the saddle-point policies (3.25)–(3.26); it states that the derivation is 'in the same vein' as single-agent settings and omits it. Because these formulas are the main output of Chapter 3, the derivation must be included or a precise external reference with matching assumptions must be supplied. In addition, Remark 3 disclaims existence for the HJI boundary-value problem, which creates tension with Theorem 8's assertion of existence and uniqueness of the saddle-point solution.
minor comments (4)
  1. [§3.5.1 and §3.5.2] The text twice refers to 'Assumption 1' when the relevant assumption for Chapter 3 is Assumption 4; for example, 'Assumption 1 is satisfied' should read 'Assumption 4 is satisfied'.
  2. [Throughout] Typos and wording: 'Feyman-Kac' in §2.6.1 should be 'Feynman-Kac'; 'Bratagnolle-Huber' in §5.4 should be 'Bretagnolle–Huber'; 'exits' in §3.4.2 should be 'exists'; 'the the' appears in §2.5.2; and 'Kullback-Leibler (KL) divergence' is sometimes rendered with inconsistent hyphenation.
  3. [§2.6.3.2 (Theorem 5)] The importance-sampling likelihood ratio expression is written ambiguously: it should be dQ*/dP ≈ (r(i)/r)/(1/N) = N r(i)/r, followed by Pfail ≈ Σ_i (r(i)/r)1_{x(i)(tf)∈∂Xs}. The missing parentheses make the proof hard to follow.
  4. [Chapter 7] Chapter 7 is listed in the abstract and table of contents as containing a discrete-time LQR path integral solution and a sample complexity analysis, but no content of that chapter is present in the submitted text. The sample complexity claim in the abstract therefore cannot be verified.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the derivations are self-contained, proceeding from stated HJB/HJI PDEs and Feynman-Kac representations without fitting parameters to target results; the main caveat is an explicitly conjectured regularity assumption, which is a gap rather than a circular step.

full rationale

The paper's derivation chain is self-contained in the sense required by the circularity analysis. Chapter 2 constructs the dual function by solving the HJB PDE (2.15), linearizes it under the explicitly stated Assumption 1 via the transformation (2.26), uses the Feynman-Kac representation (2.29), and evaluates the dual ascent updates from Monte Carlo estimates of the failure probability; no parameter is fitted to the claimed zero-duality-gap result, and the path-integral solutions are compared against an independent finite-difference baseline in Section 2.7.1. Chapter 3 follows the same structure from the HJI PDE (3.8) under Assumption 4, with existence and uniqueness delegated to standard PDE theory (Friedman) rather than to the author's own work. Chapters 4, 5, and 7 apply the same Feynman-Kac / KL-control machinery with explicit linearizability and stochasticity assumptions; the optimal policies are derived from the stated cost and dynamics, not from the simulation outputs. The principal caveat is Theorem 3, whose strong-duality conclusion depends on Assumption 3, the continuity of eta -> Pfail(x0,t0,u*(.;eta)). The text explicitly says: 'We conjecture that this assumption is valid under mild conditions; a formal analysis is postponed as future work' (Section 2.6.2), and Section 2.9 repeats that proving it is future work. This is an unproved premise or correctness gap, not a circular reduction: the assumption does not assert the theorem's conclusion, and the theorem is not used to define the assumption. Likewise, Remark 3 in Chapter 3 and the omitted derivation in Theorem 8 are omissions, not circularity. The paper contains self-citations (e.g., Patil et al. 2022, 2024, 2023a), but none is load-bearing: the Feynman-Kac representation is a standard external result, the sample-complexity remarks are peripheral, and the linearizability conditions are stated and used explicitly rather than imported as unexamined ansatzes. The simulations in Chapter 2 compare against FDM, and Chapter 7 compares against the Riccati solution, providing external benchmarks. Accordingly, no specific reduction of a claimed prediction to its own inputs can be exhibited, and the appropriate finding is no significant circularity.

Assumptions & free parameters 4 free parameters · 10 assumptions · 0 invented entities

The main structural costs are the noise-control proportionality assumptions (Assumptions 1 and 4), the unproven continuity conjecture (Assumption 3), and the deterministic-dynamics assumption in the deception chapter. Standard stochastic calculus results such as Feynman-Kac, Ito, Girsanov, and the strong law are imported from textbooks and are charged as axioms because they are not proved in the dissertation. No new physical entities are introduced.

free parameters (4)
  • lambda (PDE linearizing constant) = varies per problem; e.g. lambda = 1/(1 - 1/gamma^2), lambda = 1/(1 - 1/rv^2)
    Chosen by hand to satisfy Assumption 1 or Assumption 4, the noise-control proportionality condition. It is essential for linearizing the HJB or HJI PDE via the logarithmic transformation.
  • alpha (control cost weight in task hierarchy) = 10
    Hand-chosen in Chapter 4 simulations to balance the quadratic control cost against the state cost in the path integral objective.
  • s-hat (diffusion coefficient in task hierarchy) = 0.1
    Hand-chosen in Chapter 4 to inject exploration noise into the control channel. The paper notes that this value should be carefully selected, so it is a free design parameter.
  • lambda (KL weighting in deceptive control) = 3, 2, 0.5 in simulations
    User-specified trade-off between the agent's path cost and the KL divergence from the reference policy. It changes the behavior of the deceptive policy and is not derived from data.
assumptions (10)
  • standard math Feynman-Kac lemma
    Used to represent solutions of linearized PDEs as expectations over uncontrolled stochastic trajectories, e.g., Lemma 1 in Chapter 2 and Theorem 10 in Chapter 4.
  • standard math Ito formula and Dynkin's formula
    Used in verification theorems for HJB and HJI PDEs, specifically in the proofs of Theorem 1 and Theorem 7.
  • standard math Strong law of large numbers
    Used to justify convergence of Monte Carlo estimators, e.g., in Chapter 2 Theorem 5 and Chapter 5 Equation (5.21).
  • standard math Girsanov theorem and Radon-Nikodym likelihood ratios
    Used for importance-sampling estimation of failure probabilities in Chapter 2 and for the KL divergence calculations in Chapter 5.
  • standard math Legendre duality between KL divergence and free energy
    Used in Chapter 5 Theorem 12 to characterize the optimal deceptive policy distribution.
  • ad hoc to paper Assumption 1: Sigma Sigma^T = lambda G R^{-1} G^T
    Introduced in Section 2.6.1 to make the HJB PDE linearizable. It restricts noise to enter through control channels and is not a general structural property of all systems.
  • domain assumption Assumption 2: strict feasibility (Slater-like condition)
    Assumed in Chapter 2 to guarantee a finite dual optimum and zero duality gap. It is a standard constraint qualification in optimization.
  • ad hoc to paper Assumption 3: continuity of eta -> Pfail(u*(.; eta))
    Explicitly labeled a conjecture in Section 2.6.2 and deferred to future work. It is required for the strong duality Theorem 3 and is not proved.
  • ad hoc to paper Assumption 4: Sigma Sigma^T = lambda (Gu Ru^{-1} Gu^T - Gv Rv^{-1} Gv^T)
    Introduced in Chapter 3 to linearize the HJI PDE for two-player games. It requires the agent's effective control authority to dominate the adversary's.
  • ad hoc to paper Assumption 5: deterministic state transition law in deception
    Used in Chapter 5 to linearize the backward Bellman recursion and derive the path integral solution. It also requires the reference policy to be stochastic for the deception problem to be nontrivial.

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Pith. "Pith review of Advancing Frontiers of Path Integral Theory for Stochastic Optimal Control." pith.science (2026). https://pith.science/paper/WLT6CDSY

@misc{pith2026250417154,
  author       = {Pith},
  title        = {Pith review of: Advancing Frontiers of Path Integral Theory for Stochastic Optimal Control},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/WLT6CDSY}},
  note         = {Machine review of arXiv:2504.17154}
}
read the original abstract

Stochastic Optimal Control (SOC) problems arise in systems influenced by uncertainty, such as autonomous robots or financial models. Traditional methods like dynamic programming are often intractable for high-dimensional, nonlinear systems due to the curse of dimensionality. This dissertation explores the path integral control framework as a scalable, sampling-based alternative. By reformulating SOC problems as expectations over stochastic trajectories, it enables efficient policy synthesis via Monte Carlo sampling and supports real-time implementation through GPU parallelization. We apply this framework to six classes of SOC problems: Chance-Constrained SOC, Stochastic Differential Games, Deceptive Control, Task Hierarchical Control, Risk Mitigation of Stealthy Attacks, and Discrete-Time LQR. A sample complexity analysis for the discrete-time case is also provided. These contributions establish a foundation for simulator-driven autonomy in complex, uncertain environments.

Figures

Figures reproduced from arXiv: 2504.17154 by the authors.

Figure 1.1
Figure 1.1. Dissertation Structure as follows: we develop the path integral control theory for six classes of stochastic optimal control problems: Chance-Constrained SOC (Chapter 2), Two-Player Zero￾Sum Stochastic Differential Games (Chapter 3), Task Hierarchical Control (Chapter 4), Deceptive Control (Chapter 5), Deceptive Attack Synthesis and Its Mitigation (Chapter 6) and Stochastic LQR Problem (Chapter 7). Chapter 7 also de… view at source ↗
Figure 2.1
Figure 2.1. Computational domains and exit times tf 2.5 Problem Formulation We first formalize a chance-constrained SOC problem in Section 2.5.1. In Section 2.5.2, we formulate its dual. 2.5.1 Chance-Constrained SOC Problem Consider a cost function that is quadratic in the control input and has the form: C (x0, t0, u(·)) := Ex0,t0 " ψ (x(tf )) · 1x(tf )∈Xs + Z tf t0  1 2 u ⊤R (x(t), t) u + V (x(t), t)  dt# where ψ (x(tf )) de… view at source ↗
Figure 2
Figure 2. represents how the value of [PITH_FULL_IMAGE:figures/full_fig_p056_2.png] view at source ↗
Figures from the paper (35 more)
Figure 2.2
Figure 2.2. Figure 2.2: Robot navigation problem for the input velocity model. The start position [PITH_FULL_IMAGE:figures/full_fig_p057_2_2.png]
Figure 2
Figure 2. Figure 2: shows the colormaps of the failure probabilities of the synthesized [PITH_FULL_IMAGE:figures/full_fig_p057_2.png]
Figure 2.3
Figure 2.3. Figure 2.3: η ∗ and Pfail(x0, t0, u∗ (· ; η ∗ )) vs ∆ for input velocity model using path integral control and FDM. value of ∆ = 0.25. The factors that affect the computation speed of FDM include the grid size, the choice of an ODE solver and its error tolerances. Whereas the co…
Figure 2.4
Figure 2.4. Figure 2.4: Input velocity model: comparison of solutions [PITH_FULL_IMAGE:figures/full_fig_p059_2_4.png]
Figure 2.5
Figure 2.5. Figure 2.5: Colormaps of the failure probabilities of the optimal policies synthesized [PITH_FULL_IMAGE:figures/full_fig_p060_2_5.png]
Figure 2
Figure 2. Figure 2: represents how the value of [PITH_FULL_IMAGE:figures/full_fig_p060_2.png]
Figure 2.6
Figure 2.6. Figure 2.6: Robot navigation problem for the unicycle model. The start position is [PITH_FULL_IMAGE:figures/full_fig_p061_2_6.png]
Figure 2.7
Figure 2.7. Figure 2.7: η ∗ and Pfail(x0, t0, u∗ (· ; η ∗ )) vs ∆ for unicycle model using path integral control. In [PITH_FULL_IMAGE:figures/full_fig_p062_2_7.png]
Figure 2.8
Figure 2.8. Figure 2.8: Robot navigation problem for a car model. The start position is shown [PITH_FULL_IMAGE:figures/full_fig_p063_2_8.png]
Figure 2.9
Figure 2.9. Figure 2.9: η ∗ and Pfail(x0, t0, u∗ (· ; η ∗ )) vs ∆ for a car model using path integral control. cost functions. In future work, we plan to find alternatives in order to get rid of this restrictive assumption (one such solution is provided in Satoh et al. (2016)). Another topi…
Figure 3.1
Figure 3.1. Figure 3.1: Unicycle navigation in the presence of bounded and stochastic distur [PITH_FULL_IMAGE:figures/full_fig_p084_3_1.png]
Figure 3.2
Figure 3.2. Figure 3.2: Unicycle navigation in the presence of bounded and stochastic distur [PITH_FULL_IMAGE:figures/full_fig_p085_3_2.png]
Figure 3.3
Figure 3.3. Figure 3.3: Two sample trajectories of the relative position of the players in a pursuit [PITH_FULL_IMAGE:figures/full_fig_p087_3_3.png]
Figure 3.4
Figure 3.4. Figure 3.4: Failure probabilities of the agent (i.e., evader) as a function of [PITH_FULL_IMAGE:figures/full_fig_p087_3_4.png]
Figure 4.1
Figure 4.1. Figure 4.1: Comparison of the conventional task hierarchical control approach and our [PITH_FULL_IMAGE:figures/full_fig_p099_4_1.png]
Figure 4
Figure 4. Figure 4: shows the comparison of the conventional task hierarchical control approach [PITH_FULL_IMAGE:figures/full_fig_p103_4.png]
Figure 4.2
Figure 4.2. Figure 4.2: Results of single-agent example without the path integral controller [PITH_FULL_IMAGE:figures/full_fig_p107_4_2.png]
Figure 4.3
Figure 4.3. Figure 4.3: Results of single-agent example using the path integral controller [PITH_FULL_IMAGE:figures/full_fig_p108_4_3.png]
Figure 4
Figure 4. Figure 4: (a) represents the results of the hierarchical controller when all three tasks [PITH_FULL_IMAGE:figures/full_fig_p111_4.png]
Figure 4.4
Figure 4.4. Figure 4.4: Results of two-agents example without the path integral controller [PITH_FULL_IMAGE:figures/full_fig_p112_4_4.png]
Figure 4.5
Figure 4.5. Figure 4.5: Results of two-agents example using the path integral controller [PITH_FULL_IMAGE:figures/full_fig_p112_4_5.png]
Figure 4.6
Figure 4.6. Figure 4.6: Distance between agents over time controller for task 2) is designed using a PD controller [PITH_FULL_IMAGE:figures/full_fig_p113_4_6.png]
Figure 5.1
Figure 5.1. Figure 5.1: Function Ft(x). Then, we select a sample ID by jt ← F −1 t (d). Finally, the control input adopted in the jt-th sample path at time step t is selected as ut , i.e., ut ← ut(jt). Theorem 13 proves that as the number of Monte Carlo samples tends to infinity, Algorithm …
Figure 5.2
Figure 5.2. Figure 5.2: A unicycle navigation problem. The start position is shown by a red dot, [PITH_FULL_IMAGE:figures/full_fig_p134_5_2.png]
Figure 5
Figure 5. Figure 5: shows the expected log-likelihood ratio (with one standard devia [PITH_FULL_IMAGE:figures/full_fig_p136_5.png]
Figure 5.3
Figure 5.3. Figure 5.3: Expected LLR (with one standard deviation) with respect to time [PITH_FULL_IMAGE:figures/full_fig_p137_5_3.png]
Figure 6.1
Figure 6.1. Figure 6.1: Attacker vs controller/detector. Remark 9. One can consider more general attack signals of the form dvt = θt(ω)dt + σt(ω)dwt , v0 = 0 (6.3) with a diffusion coefficient σt(ω) ̸= 1. However, from the attacker’s perspective, there’s no benefit in such a generalization …
Figure 6.2
Figure 6.2. Figure 6.2: Error bounds and achievable region (shown in yellow). [PITH_FULL_IMAGE:figures/full_fig_p149_6_2.png]
Figure 6.3
Figure 6.3. Figure 6.3: Connections between minimax KL control, risk-sensitive control, and two [PITH_FULL_IMAGE:figures/full_fig_p157_6_3.png]
Figure 6.4
Figure 6.4. Figure 6.4: A unicycle navigation problem. 100 sample paths generated without the [PITH_FULL_IMAGE:figures/full_fig_p165_6_4.png]
Figure 6.5
Figure 6.5. Figure 6.5: Cruise control problem. The start position is shown by a magenta dot on [PITH_FULL_IMAGE:figures/full_fig_p168_6_5.png]
Figure 6
Figure 6. Figure 6: (d) shows the plots of 100 sample trajectories generated using synthesized [PITH_FULL_IMAGE:figures/full_fig_p170_6.png]
Figure 7.1
Figure 7.1. Figure 7.1: State and input trajectories for two values of [PITH_FULL_IMAGE:figures/full_fig_p188_7_1.png]
Figure 7.2
Figure 7.2. Figure 7.2: ϵ0 and LQR cost vs sample size 188 [PITH_FULL_IMAGE:figures/full_fig_p188_7_2.png]
Figure 9.1
Figure 9.1. Figure 9.1: Summary of the dissertation 199 [PITH_FULL_IMAGE:figures/full_fig_p199_9_1.png]

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Pith tools

Reviewed August 16, 2026 · model on record in the stance chip above.