Toward Explainability in Urban Motion Prediction—Survey and Outlook

Author:

Okanovic Ilma1,Stolz Michael2,Hillbrand Bernhard2

Affiliation:

1. Virtual Vehicle Research GmbH, Autonomous Systems, Austria

2. Virtual Vehicle Research GmbH, Austria

Abstract

<div>With the influx of artificial intelligence (AI) models aiding the development of autonomous driving (AD), it has become increasingly important to analyze and categorize aspects of their operation. In conjunction with the high predictive power innate to AI solutions, due to the safety requirements inherent to automotive systems and the demands for transparency imposed by legislature, there is a natural demand for explainable and predictable models. In this work, we explore the various strategies that reveal the inner workings of these models at various component levels, focusing on those adapted at the modeling stage. Specifically, we highlight and review the use of explainability in state-of-the-art AI-based scenario understanding and motion prediction methods, which represent an integral part of any AD system. We break the discussion down across three key axes that are inherent to any AI solution: the data, the model architecture, and the loss optimization. For each of the axes, we outline the general methodologies for introducing explainability, and reference and review some practical realizations for each methodology. We conclude the article by identifying several strategies that we believe are yet to be fully explored, such as physics-inspired machine learning methods, neural network pretraining, graph neural networks designed using domain-specific priors, and end-to-end trainable networks based on differentiable kinematic models.</div>

Publisher

SAE International

Reference72 articles.

1. European Automobile Manufacture Association 2020 https://www.acea.auto/uploads/publications/ACEA_Position_Paper-Artificial_Intelligence_in_the_automotive_industry.pdf

2. European Commission 2021 https://eur-lex.europa.eu/legalcontent/EN/TXT/?uri=CELEX:52021PC0206

3. SAE International TM 2021 https://www.sae.org/blog/sae-j3016-update

4. International Organization for Standardization 2022

5. Omeiza , D. , Webb , H. , Jirotka , M. , and Kunze , L. Explanations in Autonomous Driving: A Survey IEEE Transactions on Intelligent Transportation Systems 23 8 2021 10142 10162

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