Search Results for author: Maximilian Schiffer

Found 22 papers, 10 papers with code

Multi-Agent Soft Actor-Critic with Global Loss for Autonomous Mobility-on-Demand Fleet Control

2 code implementations10 Apr 2024 Zeno Woywood, Jasper I. Wiltfang, Julius Luy, Tobias Enders, Maximilian Schiffer

We study a sequential decision-making problem for a profit-maximizing operator of an Autonomous Mobility-on-Demand system.

Decision Making

Risk-Sensitive Soft Actor-Critic for Robust Deep Reinforcement Learning under Distribution Shifts

1 code implementation15 Feb 2024 Tobias Enders, James Harrison, Maximilian Schiffer

We study the robustness of deep reinforcement learning algorithms against distribution shifts within contextual multi-stage stochastic combinatorial optimization problems from the operations research domain.

Combinatorial Optimization reinforcement-learning

Contextual Stochastic Vehicle Routing with Time Windows

no code implementations10 Feb 2024 Breno Serrano, Alexandre M. Florio, Stefan Minner, Maximilian Schiffer, Thibaut Vidal

We study the vehicle routing problem with time windows (VRPTW) and stochastic travel times, in which the decision-maker observes related contextual information, represented as feature variables, before making routing decisions.

Global Rewards in Multi-Agent Deep Reinforcement Learning for Autonomous Mobility on Demand Systems

1 code implementation14 Dec 2023 Heiko Hoppe, Tobias Enders, Quentin Cappart, Maximilian Schiffer

We study vehicle dispatching in autonomous mobility on demand (AMoD) systems, where a central operator assigns vehicles to customer requests or rejects these with the aim of maximizing its total profit.

counterfactual

Strategic Workforce Planning in Crowdsourced Delivery with Hybrid Driver Fleets

no code implementations28 Nov 2023 Julius Luy, Gerhard Hiermann, Maximilian Schiffer

Against this background, we jointly study a workforce planning problem that considers fixed drivers (FDs) and the temporal development of the crowdsourced driver (CD) fleet over a long-term time horizon.

Combinatorial Optimization enriched Machine Learning to solve the Dynamic Vehicle Routing Problem with Time Windows

1 code implementation3 Apr 2023 Léo Baty, Kai Jungel, Patrick S. Klein, Axel Parmentier, Maximilian Schiffer

With the rise of e-commerce and increasing customer requirements, logistics service providers face a new complexity in their daily planning, mainly due to efficiently handling same day deliveries.

Combinatorial Optimization Stochastic Optimization

Learning-based Online Optimization for Autonomous Mobility-on-Demand Fleet Control

1 code implementation8 Feb 2023 Kai Jungel, Axel Parmentier, Maximilian Schiffer, Thibaut Vidal

Autonomous mobility-on-demand systems are a viable alternative to mitigate many transportation-related externalities in cities, such as rising vehicle volumes in urban areas and transportation-related pollution.

Combinatorial Optimization Model Predictive Control

Hybrid Multi-agent Deep Reinforcement Learning for Autonomous Mobility on Demand Systems

1 code implementation14 Dec 2022 Tobias Enders, James Harrison, Marco Pavone, Maximilian Schiffer

We consider the sequential decision-making problem of making proactive request assignment and rejection decisions for a profit-maximizing operator of an autonomous mobility on demand system.

Decision Making reinforcement-learning +1

Bilevel Optimization for Feature Selection in the Data-Driven Newsvendor Problem

no code implementations12 Sep 2022 Breno Serrano, Stefan Minner, Maximilian Schiffer, Thibaut Vidal

The lower-level problem learns the optimal coefficients of the decision function on a training set, using only the features selected by the upper-level.

Bilevel Optimization Explainable Models +1

Coordinating charging request allocation between self-interested navigation service platforms

no code implementations19 Aug 2022 Marianne Guillet, Maximilian Schiffer

While such fleet-optimized charging station visit recommendations may alleviate local bottlenecks, they can also harm the system if self-interested navigation service platforms seek to maximize their own customers' satisfaction.

Support Vector Machines with the Hard-Margin Loss: Optimal Training via Combinatorial Benders' Cuts

1 code implementation15 Jul 2022 Ítalo Santana, Breno Serrano, Maximilian Schiffer, Thibaut Vidal

The classical hinge-loss support vector machines (SVMs) model is sensitive to outlier observations due to the unboundedness of its loss function.

Optimal Decision Diagrams for Classification

no code implementations28 May 2022 Alexandre M. Florio, Pedro Martins, Maximilian Schiffer, Thiago Serra, Thibaut Vidal

Decision diagrams for classification have some notable advantages over decision trees, as their internal connections can be determined at training time and their width is not bound to grow exponentially with their depth.

Classification Fairness

Coordinated Charging Station Search in Stochastic Environments: A Multi-Agent Approach

no code implementations26 Apr 2022 Marianne Guillet, Maximilian Schiffer

We model a multi-agent stochastic charging station search problem as a finite-horizon Markov decision process and introduce an online solution framework applicable to static and dynamic policies.

Blocking Decision Making

Electric vehicle charge scheduling with flexible service operations

no code implementations11 Jan 2022 Patrick Sean Klein, Maximilian Schiffer

Specifically, time-ineffective recharging operations limit the profitability of charging during service operations such that operators recharge vehicles off-duty at a central depot.

Scheduling

The Customer is Always Right: Customer-Centered Pooling for Ride-Hailing Systems

no code implementations2 Jul 2021 Paul Karaenke, Maximilian Schiffer, Stefan Waldherr

We study the benefit of this mechanism from a customer, fleet operator, and system perspective, and compare it to existing provider-centered pooling (PCP) mechanisms.

A Concise Guide on the Integration of Battery Electric Buses into Urban Bus Networks

no code implementations21 Apr 2021 Nicolas Dirks, Dennis Wagner, Maximilian Schiffer, Grit Walther

With the increasing market penetration of battery-electric buses into urban bus networks, practitioners face many novel planning problems.

Decision Making

On the Integration of Battery Electric Buses into Urban Bus Networks

no code implementations22 Mar 2021 Nicolas Dirks, Maximilian Schiffer, Grit Walther

By analyzing the impact of battery capacities and charging power on the optimal fleet transformation, we show that medium-power charging facilities combined with medium-capacity batteries are superior to networks with low-power or high-power charging facilities.

Born-Again Tree Ensembles

1 code implementation ICML 2020 Thibaut Vidal, Toni Pacheco, Maximilian Schiffer

The use of machine learning algorithms in finance, medicine, and criminal justice can deeply impact human lives.

BIG-bench Machine Learning Interpretable Machine Learning

On the Interaction between Autonomous Mobility on Demand Systems and Power Distribution Networks -- An Optimal Power Flow Approach

1 code implementation1 May 2019 Alvaro Estandia, Maximilian Schiffer, Federico Rossi, Justin Luke, Emre Can Kara, Ram Rajagopal, Marco Pavone

Specifically, we extend previous results on an optimization-based modeling approach for electric AMoD systems to jointly control an electric AMoD fleet and a series of PDNs, and analyze the benefit of coordination under load balancing constraints.

Self-Driving Cars

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