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Regret Analysis of Policy Optimization over Submanifolds for Linearly Constrained Online LQG


מושגי ליבה
Proposing an online second-order method, OONM, based on a Riemannian metric for linearly constrained online LQG problems.
תקציר

Recent advancements in online optimization and control have led to the study of linear quadratic regulator (LQR) problems with varying cost matrices. The proposed OONM algorithm leverages predictions on first and second-order function information to provide adaptive control in real-time. Regret is defined as the sub-optimality of cumulative costs compared to a minimizing controller sequence. Existing works typically parameterize controllers linearly, lacking practical conditions like sparsity. The study extends the offline LQR setup to an online scenario with linear constraints, focusing on regret against minimizing policies. Simulation results confirm the effectiveness of OONM in providing adaptive control.

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סטטיסטיקה
Recent advancement in online optimization and control. Second-order method for linearly constrained LQR. Regret defined as sub-optimality of cumulative costs. Controller parameterization challenges due to lack of sparsity. Extension of offline LQR setup to online with linear constraints.
ציטוטים
"The proposed OONM algorithm leverages predictions on first and second-order function information." "Regret is defined as the sub-optimality of cumulative costs compared to a minimizing controller sequence." "The study extends the offline LQR setup to an online scenario with linear constraints." "Simulation results confirm the effectiveness of OONM in providing adaptive control."

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What are potential drawbacks or limitations of relying heavily on Riemannian metrics for optimization algorithms

While Riemannian metrics offer advantages in capturing the underlying geometry of optimization problems and providing more accurate update directions for algorithms like Newton methods on manifolds, there are also potential drawbacks and limitations to relying heavily on them. One limitation is computational complexity - calculating geodesic distances or parallel transport operations required by Riemannian metrics can be computationally expensive for high-dimensional spaces or complex manifolds. Another drawback is sensitivity to metric choice - selecting an inappropriate metric may lead to suboptimal performance or convergence issues for optimization algorithms. Additionally, interpreting results based on Riemannian metrics may require specialized knowledge and expertise in differential geometry.

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Advancements in online learning have the potential to impact traditional optimal control methods by introducing adaptive and real-time capabilities into control systems design. Online learning techniques allow controllers to adapt dynamically to changing environments without requiring a full model of the system dynamics beforehand. This flexibility enables controllers to learn from data collected during operation, improving their performance over time through experience rather than relying solely on pre-defined models. Furthermore, online learning methods can enhance robustness against uncertainties or disturbances by continuously updating controller parameters based on real-time feedback signals.
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