Detection Transformer (DETR) directly transforms queries to unique objects by using one-to-one bipartite matching during training and enables end-to-end object detection. Recently, these models have surpassed traditional detectors on COCO with undeniable elegance. However, they differ from traditional detectors in multiple designs, including model architecture and training schedules, and thus the effectiveness of one-to-one matching is not fully understood. In this work, we conduct a strict comparison between the one-to-one Hungarian matching in DETRs and the one-to-many label assignments in traditional detectors with non-maximum supervision (NMS). Surprisingly, we observe one-to-many assignments with NMS consistently outperform standard one-to-one matching under the same setting, with a significant gain of up to 2.5 mAP. Our detector that trains Deformable-DETR with traditional IoU-based label assignment achieved 50.2 COCO mAP within 12 epochs (1x schedule) with ResNet50 backbone, outperforming all existing traditional or transformer-based detectors in this setting. On multiple datasets, schedules, and architectures, we consistently show bipartite matching is unnecessary for performant detection transformers. Furthermore, we attribute the success of detection transformers to their expressive transformer architecture. Code is available at https://github.com/jozhang97/DETA.

This paper presents an approach that reconstructs a hand-held object from a monocular video. In contrast to many recent methods that directly predict object geometry by a trained network, the proposed approach does not require any learned prior about the object and is able to recover more accurate and detailed object geometry. The key idea is that the hand motion naturally provides multiple views of the object and the motion can be reliably estimated by a hand pose tracker. Then, the object geometry can be recovered by solving a multi-view reconstruction problem. We devise an implicit neural representation-based method to solve the reconstruction problem and address the issues of imprecise hand pose estimation, relative hand-object motion, and insufficient geometry optimization for small objects. We also provide a newly collected dataset with 3D ground truth to validate the proposed approach.

Despite the recent visually-pleasing results achieved, the massive computational cost has been a long-standing flaw for diffusion probabilistic models (DPMs), which, in turn, greatly limits their applications on resource-limited platforms. Prior methods towards efficient DPM, however, have largely focused on accelerating the testing yet overlooked their huge complexity and sizes. In this paper, we make a dedicated attempt to lighten DPM while striving to preserve its favourable performance. We start by training a small-sized latent diffusion model (LDM) from scratch, but observe a significant fidelity drop in the synthetic images. Through a thorough assessment, we find that DPM is intrinsically biased against high-frequency generation, and learns to recover different frequency components at different time-steps. These properties make compact networks unable to represent frequency dynamics with accurate high-frequency estimation. Towards this end, we introduce a customized design for slim DPM, which we term as Spectral Diffusion (SD), for light-weight image synthesis. SD incorporates wavelet gating in its architecture to enable frequency dynamic feature extraction at every reverse steps, and conducts spectrum-aware distillation to promote high-frequency recovery by inverse weighting the objective based on spectrum magni tudes. Experimental results demonstrate that, SD achieves 8-18x computational complexity reduction as compared to the latent diffusion models on a series of conditional and unconditional image generation tasks while retaining competitive image fidelity.

由于检测数据集的规模小，当前对象探测器的词汇量受到限制。另一方面，图像分类器的原因是大约更大的词汇表，因为他们的数据集更大，更容易收集。我们提出守则，只需在图像分类数据上培训检测器的分类器，从而扩展了探测器的词汇量到数万个概念。与现有工作不同，拒绝不会根据模型预测将图像标签分配给框，使其更容易实现和兼容一系列检测架构和骨架。我们的结果表明，即使没有箱子注释，否则差异也能产生出色的探测器。它优于开放词汇和长尾检测基准的事先工作。拒绝为所有类和8.3地图提供了2.4地图的增益，用于开放词汇LVIS基准测试中的新型类。在标准的LVIS基准测试中，守护者达到41.7地图所有课程和41.7地图以获得罕见课程。我们首次培训一个探测器，其中包含所有二十一千类的ImageNet数据集，并显示它在没有微调的情况下推广到新数据集。代码可在https://github.com/facebookresearch/dorm提供。

学习时空事件的动态是一个根本的问题。神经点过程提高了与深神经网络的点过程模型的表现。但是，大多数现有方法只考虑没有空间建模的时间动态。我们提出了深蓝点过程（DeepStpp），这是一款整合时空点流程的深层动力学模型。我们的方法灵活，高效，可以在空间和时间准确地预测不规则采样的事件。我们方法的关键构造是非参数时空强度函数，由潜在过程管理。强度函数享有密度的闭合形式集成。潜在进程捕获事件序列的不确定性。我们使用摊销变分推理来推断使用深网络的潜在进程。使用合成数据集，我们验证我们的模型可以准确地学习真实的强度函数。在真实世界的基准数据集上，我们的模型展示了最先进的基线的卓越性能。

基于LIDAR的传感驱动器电流自主车辆。尽管进展迅速，但目前的激光雷达传感器在分辨率和成本方面仍然落后于传统彩色相机背后的二十年。对于自主驾驶，这意味着靠近传感器的大物体很容易可见，但远方或小物体仅包括一个测量或两个。这是一个问题，尤其是当这些对象结果驾驶危险时。另一方面，在车载RGB传感器中清晰可见这些相同的对象。在这项工作中，我们提出了一种将RGB传感器无缝熔化成基于LIDAR的3D识别方法。我们的方法采用一组2D检测来生成密集的3D虚拟点，以增加否则稀疏的3D点云。这些虚拟点自然地集成到任何基于标准的LIDAR的3D探测器以及常规激光雷达测量。由此产生的多模态检测器简单且有效。大规模NUSCENES数据集的实验结果表明，我们的框架通过显着的6.6地图改善了强大的中心点基线，并且优于竞争融合方法。代码和更多可视化可在https://tianweiy.github.io/mvp/上获得

Tracking has traditionally been the art of following interest points through space and time. This changed with the rise of powerful deep networks. Nowadays, tracking is dominated by pipelines that perform object detection followed by temporal association, also known as tracking-by-detection. We present a simultaneous detection and tracking algorithm that is simpler, faster, and more accurate than the state of the art. Our tracker, CenterTrack, applies a detection model to a pair of images and detections from the prior frame. Given this minimal input, CenterTrack localizes objects and predicts their associations with the previous frame. That's it. CenterTrack is simple, online (no peeking into the future), and real-time. It achieves 67.8% MOTA on the MOT17 challenge at 22 FPS and 89.4% MOTA on the KITTI tracking benchmark at 15 FPS, setting a new state of the art on both datasets. CenterTrack is easily extended to monocular 3D tracking by regressing additional 3D attributes. Using monocular video input, it achieves 28.3% AMOTA@0.2 on the newly released nuScenes 3D tracking benchmark, substantially outperforming the monocular baseline on this benchmark while running at 28 FPS.

Most multimodal multi-objective evolutionary algorithms (MMEAs) aim to find all global Pareto optimal sets (PSs) for a multimodal multi-objective optimization problem (MMOP). However, in real-world problems, decision makers (DMs) may be also interested in local PSs. Also, searching for both global and local PSs is more general in view of dealing with MMOPs, which can be seen as a generalized MMOP. In addition, the state-of-the-art MMEAs exhibit poor convergence on high-dimension MMOPs. To address the above two issues, in this study, a novel coevolutionary framework termed CoMMEA for multimodal multi-objective optimization is proposed to better obtain both global and local PSs, and simultaneously, to improve the convergence performance in dealing with high-dimension MMOPs. Specifically, the CoMMEA introduces two archives to the search process, and coevolves them simultaneously through effective knowledge transfer. The convergence archive assists the CoMMEA to quickly approaching the Pareto optimal front (PF). The knowledge of the converged solutions is then transferred to the diversity archive which utilizes the local convergence indicator and the $\epsilon$-dominance-based method to obtain global and local PSs effectively. Experimental results show that CoMMEA is competitive compared to seven state-of-the-art MMEAs on fifty-four complex MMOPs.

在这项研究中，我们深入研究了半监督对象检测〜（SSOD）所面临的独特挑战。我们观察到当前的探测器通常遭受3个不一致问题。 1）分配不一致，传统的分配策略对标记噪声很敏感。 2）子任务不一致，其中分类和回归预测在同一特征点未对准。 3）时间不一致，伪Bbox在不同的训练步骤中差异很大。这些问题导致学生网络的优化目标不一致，从而恶化了性能并减慢模型收敛性。因此，我们提出了一个系统的解决方案，称为一致的老师，以补救上述挑战。首先，自适应锚分配代替了基于静态的策略，该策略使学生网络能够抵抗嘈杂的psudo bbox。然后，我们通过设计功能比对模块来校准子任务预测。最后，我们采用高斯混合模型（GMM）来动态调整伪盒阈值。一致的老师在各种SSOD评估上提供了新的强大基线。只有10％的带注释的MS-Coco数据，它可以使用Resnet-50骨干实现40.0 MAP，该数据仅使用伪标签，超过了4个地图。当对完全注释的MS-Coco进行其他未标记的数据进行培训时，性能将进一步增加到49.1 MAP。我们的代码将很快开源。

神经辐射场（NERF）及其变体在代表3D场景和合成照片现实的小说视角方面取得了巨大成功。但是，它们通常基于针孔摄像头模型，并假设全焦点输入。这限制了它们的适用性，因为从现实世界中捕获的图像通常具有有限的场地（DOF）。为了减轻此问题，我们介绍了DOF-NERF，这是一种新型的神经渲染方法，可以处理浅的DOF输入并可以模拟DOF效应。特别是，它扩展了NERF，以模拟按照几何光学的原理模拟镜头的光圈。这样的物理保证允许DOF-NERF使用不同的焦点配置操作视图。 DOF-NERF受益于显式光圈建模，还可以通过调整虚拟光圈和焦点参数来直接操纵DOF效果。它是插件，可以插入基于NERF的框架中。关于合成和现实世界数据集的实验表明，DOF-NERF不仅在全焦点设置中与NERF相当，而且可以合成以浅DOF输入为条件的全焦点新型视图。还展示了DOF-nerf在DOF渲染上的有趣应用。源代码将在https://github.com/zijinwuzijin/dof-nerf上提供。