Developing autonomous vehicles (AVs) helps improve the road safety and traffic efficiency of intelligent transportation systems (ITS). Accurately predicting the trajectories of traffic participants is essential to the decision-making and motion planning of AVs in interactive scenarios. Recently, learning-based trajectory predictors have shown state-of-the-art performance in highway or urban areas. However, most existing learning-based models trained with fixed datasets may perform poorly in continuously changing scenarios. Specifically, they may not perform well in learned scenarios after learning the new one. This phenomenon is called "catastrophic forgetting". Few studies investigate trajectory predictions in continuous scenarios, where catastrophic forgetting may happen. To handle this problem, first, a novel continual learning (CL) approach for vehicle trajectory prediction is proposed in this paper. Then, inspired by brain science, a dynamic memory mechanism is developed by utilizing the measurement of traffic divergence between scenarios, which balances the performance and training efficiency of the proposed CL approach. Finally, datasets collected from different locations are used to design continual training and testing methods in experiments. Experimental results show that the proposed approach achieves consistently high prediction accuracy in continuous scenarios without re-training, which mitigates catastrophic forgetting compared to non-CL approaches. The implementation of the proposed approach is publicly available at https://github.com/BIT-Jack/D-GSM

在城市环境中，复杂和不确定的交叉场景对于自动驾驶而言是挑战性的。为了确保安全，建立可以处理与其他车辆互动的自适应决策系统至关重要。在常见方案中，手动设计的基于模型的方法是可靠的。但是在不确定的环境中，它们不是可靠的，因此提出了基于学习的方法，尤其是强化学习（RL）方法。但是，当场景更改时，当前的RL方法需要重新培训。换句话说，当前的RL方法无法重复使用积累的知识。他们忘记了新场景时学到的知识。为了解决这个问题，我们提出了一个可以自主积累和重用知识的层次结构框架。所提出的方法将运动原语（MP）的概念与分层增强学习（HRL）结合在一起。它将复杂的问题分解为多个基本子任务以减少难度。提出的方法和其他基线方法在基于CARLA模拟器的具有挑战性的交点方案中进行了测试。相交场景包含三个不同的子任务，可以反映出真实交通流的复杂性和不确定性。在离线学习和测试之后，事实证明，所提出的方法在所有方法中具有最佳性能。

本文为可以提取车辆间交互的自治车辆提供特定于自主车辆的驾驶员风险识别框架。在驾驶员认知方式下对城市驾驶场景进行了这种提取，以提高风险场景的识别准确性。首先，将群集分析应用于驱动程序的操作数据，以学习不同驱动程序风险场景的主观评估，并为每个场景生成相应的风险标签。其次，采用图形表示模型（GRM）统一和构建动态车辆，车间交互和静态交通标记的实际驾驶场景中的特征。驾驶员特定的风险标签提供了实践，以捕获不同司机的风险评估标准。此外，图形模型表示驾驶场景的多个功能。因此，所提出的框架可以了解不同驱动程序的驾驶场景的风险评估模式，并建立特定于驱动程序的风险标识符。最后，通过使用由多个驱动程序收集的现实世界城市驾驶数据集进行的实验评估所提出的框架的性能。结果表明，建议的框架可以准确地识别实际驾驶环境中的风险及其水平。

近年来，道路安全引起了智能运输系统领域的研究人员和从业者的重大关注。作为最常见的道路用户群体之一，行人由于其不可预测的行为和运动而导致令人震惊，因为车辆行人互动的微妙误解可以很容易地导致风险的情况或碰撞。现有方法使用预定义的基于碰撞的模型或人类标签方法来估计行人的风险。这些方法通常受到他们的概括能力差，缺乏对自我车辆和行人之间的相互作用的限制。这项工作通过提出行人风险级预测系统来解决所列问题。该系统由三个模块组成。首先，收集车辆角度的行人数据。由于数据包含关于自我车辆和行人的运动的信息，因此可以简化以交互感知方式预测时空特征的预测。使用长短短期存储器模型，行人轨迹预测模块预测后续五个框架中的时空特征。随着预测的轨迹遵循某些交互和风险模式，采用混合聚类和分类方法来探讨时空特征中的风险模式，并使用学习模式训练风险等级分类器。在预测行人的时空特征并识别相应的风险水平时，确定自我车辆和行人之间的风险模式。实验结果验证了PRLP系统的能力，以预测行人的风险程度，从而支持智能车辆的碰撞风险评估，并为车辆和行人提供安全警告。

Brain midline shift (MLS) is one of the most critical factors to be considered for clinical diagnosis and treatment decision-making for intracranial hemorrhage. Existing computational methods on MLS quantification not only require intensive labeling in millimeter-level measurement but also suffer from poor performance due to their dependence on specific landmarks or simplified anatomical assumptions. In this paper, we propose a novel semi-supervised framework to accurately measure the scale of MLS from head CT scans. We formulate the MLS measurement task as a deformation estimation problem and solve it using a few MLS slices with sparse labels. Meanwhile, with the help of diffusion models, we are able to use a great number of unlabeled MLS data and 2793 non-MLS cases for representation learning and regularization. The extracted representation reflects how the image is different from a non-MLS image and regularization serves an important role in the sparse-to-dense refinement of the deformation field. Our experiment on a real clinical brain hemorrhage dataset has achieved state-of-the-art performance and can generate interpretable deformation fields.

Generalizability to unseen forgery types is crucial for face forgery detectors. Recent works have made significant progress in terms of generalization by synthetic forgery data augmentation. In this work, we explore another path for improving the generalization. Our goal is to reduce the features that are easy to learn in the training phase, so as to reduce the risk of overfitting on specific forgery types. Specifically, in our method, a teacher network takes as input the face images and generates an attention map of the deep features by a diverse multihead attention ViT. The attention map is used to guide a student network to focus on the low-attended features by reducing the highly-attended deep features. A deep feature mixup strategy is also proposed to synthesize forgeries in the feature domain. Experiments demonstrate that, without data augmentation, our method is able to achieve promising performances on unseen forgeries and highly compressed data.

In this work, we investigate improving the generalizability of GAN-generated image detectors by performing data augmentation in the fingerprint domain. Specifically, we first separate the fingerprints and contents of the GAN-generated images using an autoencoder based GAN fingerprint extractor, followed by random perturbations of the fingerprints. Then the original fingerprints are substituted with the perturbed fingerprints and added to the original contents, to produce images that are visually invariant but with distinct fingerprints. The perturbed images can successfully imitate images generated by different GANs to improve the generalization of the detectors, which is demonstrated by the spectra visualization. To our knowledge, we are the first to conduct data augmentation in the fingerprint domain. Our work explores a novel prospect that is distinct from previous works on spatial and frequency domain augmentation. Extensive cross-GAN experiments demonstrate the effectiveness of our method compared to the state-of-the-art methods in detecting fake images generated by unknown GANs.

Current mainstream object detection methods for large aerial images usually divide large images into patches and then exhaustively detect the objects of interest on all patches, no matter whether there exist objects or not. This paradigm, although effective, is inefficient because the detectors have to go through all patches, severely hindering the inference speed. This paper presents an Objectness Activation Network (OAN) to help detectors focus on fewer patches but achieve more efficient inference and more accurate results, enabling a simple and effective solution to object detection in large images. In brief, OAN is a light fully-convolutional network for judging whether each patch contains objects or not, which can be easily integrated into many object detectors and jointly trained with them end-to-end. We extensively evaluate our OAN with five advanced detectors. Using OAN, all five detectors acquire more than 30.0% speed-up on three large-scale aerial image datasets, meanwhile with consistent accuracy improvements. On extremely large Gaofen-2 images (29200$\times$27620 pixels), our OAN improves the detection speed by 70.5%. Moreover, we extend our OAN to driving-scene object detection and 4K video object detection, boosting the detection speed by 112.1% and 75.0%, respectively, without sacrificing the accuracy. Code is available at https://github.com/Ranchosky/OAN.

We study the problem of semantic segmentation calibration. For image classification, lots of existing solutions are proposed to alleviate model miscalibration of confidence. However, to date, confidence calibration research on semantic segmentation is still limited. We provide a systematic study on the calibration of semantic segmentation models and propose a simple yet effective approach. First, we find that model capacity, crop size, multi-scale testing, and prediction correctness have impact on calibration. Among them, prediction correctness, especially misprediction, is more important to miscalibration due to over-confidence. Next, we propose a simple, unifying, and effective approach, namely selective scaling, by separating correct/incorrect prediction for scaling and more focusing on misprediction logit smoothing. Then, we study popular existing calibration methods and compare them with selective scaling on semantic segmentation calibration. We conduct extensive experiments with a variety of benchmarks on both in-domain and domain-shift calibration, and show that selective scaling consistently outperforms other methods.

In this paper, we propose a large-scale language pre-training for text GENeration using dIffusion modEl, which is named GENIE. GENIE is a pre-training sequence-to-sequence text generation model which combines Transformer and diffusion. The diffusion model accepts the latent information from the encoder, which is used to guide the denoising of the current time step. After multiple such denoise iterations, the diffusion model can restore the Gaussian noise to the diverse output text which is controlled by the input text. Moreover, such architecture design also allows us to adopt large scale pre-training on the GENIE. We propose a novel pre-training method named continuous paragraph denoise based on the characteristics of the diffusion model. Extensive experiments on the XSum, CNN/DailyMail, and Gigaword benchmarks shows that GENIE can achieves comparable performance with various strong baselines, especially after pre-training, the generation quality of GENIE is greatly improved. We have also conduct a lot of experiments on the generation diversity and parameter impact of GENIE. The code for GENIE will be made publicly available.