Predicting the future motion of dynamic agents is of paramount importance to ensure safety or assess risks in motion planning for autonomous robots. In this paper, we propose a two-stage motion prediction method, referred to as R-Pred, that effectively utilizes both the scene and interaction context using a cascade of the initial trajectory proposal network and the trajectory refinement network. The initial trajectory proposal network produces M trajectory proposals corresponding to M modes of a future trajectory distribution. The trajectory refinement network enhances each of M proposals using 1) the tube-query scene attention (TQSA) and 2) the proposal-level interaction attention (PIA). TQSA uses tube-queries to aggregate the local scene context features pooled from proximity around the trajectory proposals of interest. PIA further enhances the trajectory proposals by modeling inter-agent interactions using a group of trajectory proposals selected based on their distances from neighboring agents. Our experiments conducted on the Argoverse and nuScenes datasets demonstrate that the proposed refinement network provides significant performance improvements compared to the single-stage baseline and that R-Pred achieves state-of-the-art performance in some categories of the benchmark.
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预测场景中代理的未来位置是自动驾驶中的一个重要问题。近年来,在代表现场及其代理商方面取得了重大进展。代理与场景和彼此之间的相互作用通常由图神经网络建模。但是,图形结构主要是静态的,无法表示高度动态场景中的时间变化。在这项工作中,我们提出了一个时间图表示,以更好地捕获流量场景中的动态。我们用两种类型的内存模块补充表示形式。一个专注于感兴趣的代理,另一个专注于整个场景。这使我们能够学习暂时意识的表示,即使对多个未来进行简单回归,也可以取得良好的结果。当与目标条件预测结合使用时,我们会显示出更好的结果,可以在Argoverse基准中达到最先进的性能。
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预测公路参与者的未来运动对于自动驾驶至关重要,但由于令人震惊的运动不确定性,因此极具挑战性。最近,大多数运动预测方法求助于基于目标的策略,即预测运动轨迹的终点,作为回归整个轨迹的条件,以便可以减少解决方案的搜索空间。但是,准确的目标坐标很难预测和评估。此外,目的地的点表示限制了丰富的道路环境的利用,从而导致预测不准确。目标区域,即可能的目的地区域,而不是目标坐标,可以通过涉及更多的容忍度和指导来提供更软的限制,以搜索潜在的轨迹。考虑到这一点,我们提出了一个新的基于目标区域的框架,名为“目标区域网络”(GANET)进行运动预测,该框架对目标区域进行了建模,而不是确切的目标坐标作为轨迹预测的先决条件,更加可靠,更准确地执行。具体而言,我们建议一个goicrop(目标的目标区域)操作员有效地提取目标区域中的语义巷特征,并在目标区域和模型演员的未来互动中提取语义巷,这对未来的轨迹估计很大。 Ganet在所有公共文献(直到论文提交)中排名第一个,将其源代码排在第一位。
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自主驾驶的运动预测领域的先前艺术倾向于寻找接近地面真理轨迹的轨迹。但是,这种问题的表述和方法经常导致多样性和偏见轨迹预测的丧失。因此,它们不适合现实世界的自主驾驶,在这种驾驶中,多样化和依赖道路的多模式轨迹预测对安全至关重要。为此,本研究提出了一种新颖的损失函数\ textit {lane损失},可确保地图自适应多样性并适应几何约束。对带有新型轨迹候选建议模块的两阶段轨迹预测架构,\ textit {轨迹预测注意(TPA)}经过训练,通过车道损失训练,鼓励多个轨迹分布多样,以涵盖可行的方式以图像意识的方式涵盖可行的操作。此外,考虑到现有的轨迹性能指标正在重点是基于地面真理未来轨迹评估准确性,因此还建议定量评估指标来评估预测的多个轨迹的多样性。在Argoverse数据集上进行的实验表明,所提出的方法显着提高了预测轨迹的多样性,而无需牺牲预测准确性。
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预测交通参与者的多模式未来行为对于机器人车辆做出安全决策至关重要。现有作品探索以直接根据潜在特征预测未来的轨迹,或利用密集的目标候选者来识别代理商的目的地,在这种情况下,由于所有运动模式均来自相同的功能,而后者的策略具有效率问题,因此前者策略的收敛缓慢,因为其性能高度依赖关于候选目标的密度。在本文中,我们提出了运动变压器(MTR)框架,该框架将运动预测模拟为全球意图定位和局部运动改进的联合优化。 MTR不使用目标候选者,而是通过采用一系列可学习的运动查询对来结合空间意图。每个运动查询对负责特定运动模式的轨迹预测和完善,这可以稳定训练过程并促进更好的多模式预测。实验表明,MTR在边际和联合运动预测挑战上都达到了最新的性能,在Waymo Open Motion DataSet排行榜上排名第一。代码将在https://github.com/sshaoshuai/mtr上找到。
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预测附近代理商的合理的未来轨迹是自治车辆安全的核心挑战,主要取决于两个外部线索:动态邻居代理和静态场景上下文。最近的方法在分别表征两个线索方面取得了很大进展。然而,它们忽略了两个线索之间的相关性,并且大多数很难实现地图自适应预测。在本文中,我们使用Lane作为场景数据,并提出一个分阶段网络,即共同学习代理和车道信息,用于多模式轨迹预测(JAL-MTP)。 JAL-MTP使用社交到LANE(S2L)模块来共同代表静态道和相邻代理的动态运动作为实例级车道,一种用于利用实例级车道来预测的反复出的车道注意力(RLA)机制来预测Map-Adaptive Future Trajections和两个选择器,可识别典型和合理的轨迹。在公共协议数据集上进行的实验表明JAL-MTP在定量和定性中显着优于现有模型。
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Motion prediction is highly relevant to the perception of dynamic objects and static map elements in the scenarios of autonomous driving. In this work, we propose PIP, the first end-to-end Transformer-based framework which jointly and interactively performs online mapping, object detection and motion prediction. PIP leverages map queries, agent queries and mode queries to encode the instance-wise information of map elements, agents and motion intentions, respectively. Based on the unified query representation, a differentiable multi-task interaction scheme is proposed to exploit the correlation between perception and prediction. Even without human-annotated HD map or agent's historical tracking trajectory as guidance information, PIP realizes end-to-end multi-agent motion prediction and achieves better performance than tracking-based and HD-map-based methods. PIP provides comprehensive high-level information of the driving scene (vectorized static map and dynamic objects with motion information), and contributes to the downstream planning and control. Code and models will be released for facilitating further research.
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在智能系统(例如自动驾驶和机器人导航)中,轨迹预测一直是一个长期存在的问题。最近在大规模基准测试的最新模型一直在迅速推动性能的极限,主要集中于提高预测准确性。但是,这些模型对效率的强调较少,这对于实时应用至关重要。本文提出了一个名为Gatraj的基于注意力的图形模型,其预测速度要高得多。代理的时空动力学,例如行人或车辆,是通过注意机制建模的。代理之间的相互作用是通过图卷积网络建模的。我们还实施了拉普拉斯混合物解码器,以减轻模式崩溃,并为每个代理生成多种模式预测。我们的模型以在多个开放数据集上测试的更高预测速度与最先进的模型相同的性能。
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本文提出了一个新型的深度学习框架,用于多模式运动预测。该框架由三个部分组成:经常性神经网络,以处理目标代理的运动过程,卷积神经网络处理栅格化环境表示以及一种基于距离的注意机制,以处理不同代理之间的相互作用。我们在大规模的真实驾驶数据集,Waymo Open Motion数据集上验证了所提出的框架,并将其性能与标准测试基准上的其他方法进行比较。定性结果表明,我们的模型给出的预测轨迹是准确,多样的,并且根据道路结构。标准基准测试的定量结果表明,我们的模型在预测准确性和其他评估指标方面优于其他基线方法。拟议的框架是2021 Waymo Open DataSet运动预测挑战的第二名。
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轨迹预测和行为决策是自动驾驶汽车的两项重要任务,他们需要对环境环境有良好的了解;通过参考轨迹预测的输出,可以更好地做出行为决策。但是,大多数当前解决方案分别执行这两个任务。因此,提出了结合多个线索的联合神经网络,并将其命名为整体变压器,以预测轨迹并同时做出行为决策。为了更好地探索线索之间的内在关系,网络使用现有知识并采用三种注意力机制:稀疏的多头类型用于减少噪声影响,特征选择稀疏类型,可最佳地使用部分先验知识,并与Sigmoid多头激活类型,用于最佳使用后验知识。与其他轨迹预测模型相比,所提出的模型具有更好的综合性能和良好的解释性。感知噪声稳健性实验表明,所提出的模型具有良好的噪声稳健性。因此,结合多个提示的同时轨迹预测和行为决策可以降低计算成本并增强场景与代理之间的语义关系。
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Motion prediction systems aim to capture the future behavior of traffic scenarios enabling autonomous vehicles to perform safe and efficient planning. The evolution of these scenarios is highly uncertain and depends on the interactions of agents with static and dynamic objects in the scene. GNN-based approaches have recently gained attention as they are well suited to naturally model these interactions. However, one of the main challenges that remains unexplored is how to address the complexity and opacity of these models in order to deal with the transparency requirements for autonomous driving systems, which includes aspects such as interpretability and explainability. In this work, we aim to improve the explainability of motion prediction systems by using different approaches. First, we propose a new Explainable Heterogeneous Graph-based Policy (XHGP) model based on an heterograph representation of the traffic scene and lane-graph traversals, which learns interaction behaviors using object-level and type-level attention. This learned attention provides information about the most important agents and interactions in the scene. Second, we explore this same idea with the explanations provided by GNNExplainer. Third, we apply counterfactual reasoning to provide explanations of selected individual scenarios by exploring the sensitivity of the trained model to changes made to the input data, i.e., masking some elements of the scene, modifying trajectories, and adding or removing dynamic agents. The explainability analysis provided in this paper is a first step towards more transparent and reliable motion prediction systems, important from the perspective of the user, developers and regulatory agencies. The code to reproduce this work is publicly available at https://github.com/sancarlim/Explainable-MP/tree/v1.1.
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为了安全地在各种复杂的交通情况下进行导航,自动驾驶系统通常配备了运动预测模块,为下游计划模块提供重要信息。对于现实世界应用应用程序,运动预测模型的准确性和延迟都是必不可少的。在本报告中,我们提出了一个有效而有效的解决方案,该解决方案是2022年Argoverse 2运动预测挑战中的第三名。
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安全可靠的自主驾驶堆栈(AD)的设计是我们时代最具挑战性的任务之一。预计这些广告将在具有完全自主权的高度动态环境中驱动,并且比人类更大的可靠性。从这个意义上讲,要高效,安全地浏览任意复杂的流量情景,广告必须具有预测周围参与者的未来轨迹的能力。当前的最新模型通常基于复发,图形和卷积网络,在车辆预测的背景下取得了明显的结果。在本文中,我们探讨了在生成模型进行运动预测中注意力的影响,考虑到物理和社会环境以计算最合理的轨迹。我们首先使用LSTM网络对过去的轨迹进行编码,该网络是计算社会背景的多头自我发言模块的输入。另一方面,我们制定了一个加权插值来计算最后一个观测框中的速度和方向,以便计算可接受的目标点,从HDMAP信息的可驱动的HDMAP信息中提取,这代表了我们的物理环境。最后,我们的发电机的输入是从多元正态分布采样的白噪声矢量,而社会和物理环境则是其条件,以预测可行的轨迹。我们使用Argoverse运动预测基准1.1验证我们的方法,从而实现竞争性的单峰结果。
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了解代理之间的复杂社交互动是轨迹预测的关键挑战。大多数现有方法考虑成对交通代理或在局域之间的相互作用,而相互作用的性质是无限的,涉及同时不确定的代理和非局部区域。此外,它们对不同类别的代理商来说,它们同样对待异质的交通代理,同时忽视人们在IFFerent类别的交通代理中的多种反应模式。为了解决这些问题,我们提出了一个简单但有效的无限邻域交互网络(UNIN),其预测多个类别中异构代理的轨迹。具体地,所提出的无限邻域交互模块同时产生相互作用涉及的所有代理的融合特征,其适用于任何数量的代理和任何范围的交互区域。同时,提出了一个分层图注意模块,以获取类别到类别的交互和代理到代理交互。最后,估计高斯混合模型的参数用于产生未来轨迹。基准数据集的广泛实验结果表明,通过最先进的方法对我们的方法进行了显着改进。
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自我监督学习(SSL)是一种新兴技术,已成功地用于培训卷积神经网络(CNNS)和图形神经网络(GNNS),以进行更可转移,可转换,可推广和稳健的代表性学习。然而,很少探索其对自动驾驶的运动预测。在这项研究中,我们报告了将自学纳入运动预测的首次系统探索和评估。我们首先建议研究四项新型的自我监督学习任务,以通过理论原理以及对挑战性的大规模argoverse数据集进行运动预测以及定量和定性比较。其次,我们指出,基于辅助SSL的学习设置不仅胜过预测方法,这些方法在性能准确性方面使用变压器,复杂的融合机制和复杂的在线密集目标候选优化算法,而且具有较低的推理时间和建筑复杂性。最后,我们进行了几项实验,以了解为什么SSL改善运动预测。代码在\ url {https://github.com/autovision-cloud/ssl-lanes}上开源。
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Making safe and human-like decisions is an essential capability of autonomous driving systems and learning-based behavior planning is a promising pathway toward this objective. Distinguished from existing learning-based methods that directly output decisions, this work introduces a predictive behavior planning framework that learns to predict and evaluate from human driving data. Concretely, a behavior generation module first produces a diverse set of candidate behaviors in the form of trajectory proposals. Then the proposed conditional motion prediction network is employed to forecast other agents' future trajectories conditioned on each trajectory proposal. Given the candidate plans and associated prediction results, we learn a scoring module to evaluate the plans using maximum entropy inverse reinforcement learning (IRL). We conduct comprehensive experiments to validate the proposed framework on a large-scale real-world urban driving dataset. The results reveal that the conditional prediction model is able to forecast multiple possible future trajectories given a candidate behavior and the prediction results are reactive to different plans. Moreover, the IRL-based scoring module can properly evaluate the trajectory proposals and select close-to-human ones. The proposed framework outperforms other baseline methods in terms of similarity to human driving trajectories. Moreover, we find that the conditional prediction model can improve both prediction and planning performance compared to the non-conditional model, and learning the scoring module is critical to correctly evaluating the candidate plans to align with human drivers.
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Accurately predicting interactive road agents' future trajectories and planning a socially compliant and human-like trajectory accordingly are important for autonomous vehicles. In this paper, we propose a planning-centric prediction neural network, which takes surrounding agents' historical states and map context information as input, and outputs the joint multi-modal prediction trajectories for surrounding agents, as well as a sequence of control commands for the ego vehicle by imitation learning. An agent-agent interaction module along the time axis is proposed in our network architecture to better comprehend the relationship among all the other intelligent agents on the road. To incorporate the map's topological information, a Dynamic Graph Convolutional Neural Network (DGCNN) is employed to process the road network topology. Besides, the whole architecture can serve as a backbone for the Differentiable Integrated motion Prediction with Planning (DIPP) method by providing accurate prediction results and initial planning commands. Experiments are conducted on real-world datasets to demonstrate the improvements made by our proposed method in both planning and prediction accuracy compared to the previous state-of-the-art methods.
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We propose a motion forecasting model that exploits a novel structured map representation as well as actor-map interactions. Instead of encoding vectorized maps as raster images, we construct a lane graph from raw map data to explicitly preserve the map structure. To capture the complex topology and long range dependencies of the lane graph, we propose LaneGCN which extends graph convolutions with multiple adjacency matrices and along-lane dilation. To capture the complex interactions between actors and maps, we exploit a fusion network consisting of four types of interactions, actor-to-lane, lane-to-lane, laneto-actor and actor-to-actor. Powered by LaneGCN and actor-map interactions, our model is able to predict accurate and realistic multi-modal trajectories. Our approach significantly outperforms the state-of-the-art on the large scale Argoverse motion forecasting benchmark.
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在本报告中,我们介绍了2022 Waymo Open DataSet挑战中运动预测轨迹的第一名解决方案。我们为多模式运动预测提出了一个新型的运动变压器框架,该框架引入了一组新型运动查询对,用于通过共同执行意图定位和迭代运动改进来产生更好的多模式未来轨迹。采用了一种简单的模型合奏策略,并采用了非最大抑制作用,以进一步提高最终性能。我们的方法在2022 Waymo打开数据集挑战的运动预测排行榜上取得了第一名,优于其他利润率的其他方法。代码将在https://github.com/sshaoshuai/mtr上找到。
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预测周围动态剂的未来轨迹是自动驾驶中的必要要求。这些轨迹主要取决于周围的静态环境以及这些动态剂的过去运动。此外,代理意图的多模式性质使轨迹预测问题更具挑战性。所有现有模型都同样考虑目标剂以及周围的剂,而无需考虑物理特性的变化。在本文中,我们为自动驾驶中的多模式轨迹预测提供了一个新颖的基于深度学习的框架,该框架考虑了目标及周围车辆的物理特性,例如对象类及其物理尺寸通过加权注意模块,从而改善预测的准确性。我们的模型在Nuscenes轨迹预测基准测试中取得了最高的结果,这些模型是使用栅格图来输入环境信息的模型。此外,我们的模型能够实时运行,达到300 fps的高推理率。
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