Optimization in multi-task learning (MTL) is more challenging than single-task learning (STL), as the gradient from different tasks can be contradictory. When tasks are related, it can be beneficial to share some parameters among them (cooperation). However, some tasks require additional parameters with expertise in a specific type of data or discrimination (specialization). To address the MTL challenge, we propose Mod-Squad, a new model that is Modularized into groups of experts (a 'Squad'). This structure allows us to formalize cooperation and specialization as the process of matching experts and tasks. We optimize this matching process during the training of a single model. Specifically, we incorporate mixture of experts (MoE) layers into a transformer model, with a new loss that incorporates the mutual dependence between tasks and experts. As a result, only a small set of experts are activated for each task. This prevents the sharing of the entire backbone model between all tasks, which strengthens the model, especially when the training set size and the number of tasks scale up. More interestingly, for each task, we can extract the small set of experts as a standalone model that maintains the same performance as the large model. Extensive experiments on the Taskonomy dataset with 13 vision tasks and the PASCAL-Context dataset with 5 vision tasks show the superiority of our approach.
translated by 谷歌翻译
由于经过验证的2D检测技术的适用性,大多数当前点云检测器都广泛采用了鸟类视图(BEV)。但是,现有方法通过简单地沿高度尺寸折叠的体素或点特征来获得BEV特征,从而导致3D空间信息的重丢失。为了减轻信息丢失,我们提出了一个基于多级特征降低降低策略的新颖点云检测网络,称为MDRNET。在MDRNET中,空间感知的维度降低(SDR)旨在在体素至BEV特征转换过程中动态关注对象的宝贵部分。此外,提出了多级空间残差(MSR),以融合BEV特征图中的多级空间信息。关于Nuscenes的广泛实验表明,该提出的方法的表现优于最新方法。该代码将在出版时提供。
translated by 谷歌翻译
监督的多视图立体声(MVS)方法在重建质量方面取得了显着进步,但遭受了收集大规模基础真相深度的挑战。在本文中,我们提出了一种基于知识蒸馏的MVS的新型自我监督培训管道,称为\ textit {kd-Mvs},主要由自我监督的教师培训和基于蒸馏的学生培训组成。具体而言,使用光度和特征一致性同时以自学的方式对教师模型进行了训练。然后,我们通过概率知识转移将教师模型的知识提炼为学生模型。在对经过验证的知识的监督下,学生模型能够以很大的优势优于其老师。在多个数据集上进行的广泛实验表明,我们的方法甚至可以胜过监督方法。
translated by 谷歌翻译
最近,通过神经网络参数化的隐式神经表示(INR)已成为一种强大而有前途的工具,可以代表不同种类的信号,因为其连续的,可区分的属性,表现出与经典离散表示的优越性。但是,对INR的神经网络的培训仅利用输入输出对,而目标输出相对于输入的衍生物通常忽略了输入。在本文中,我们为目标输出为图像像素的INR提出了一个训练范式,以编码图像衍生物除了神经网络中的图像值外。具体而言,我们使用有限的差异来近似图像导数。我们展示了如何利用训练范式来解决典型的INRS问题,即图像回归和逆渲染,并证明这种训练范式可以提高INR的数据效率和概括能力。我们方法的代码可在\ url {https://github.com/megvii-research/sobolev_inrs}中获得。
translated by 谷歌翻译
本地图像功能匹配,旨在识别图像对的识别和相应的相似区域,是计算机视觉中的重要概念。大多数现有的图像匹配方法遵循一对一的分配原则,并采用共同最近的邻居来确保跨图像之间本地特征之间的独特对应关系。但是,来自不同条件的图像可能会容纳大规模变化或观点多样性,以便一对一的分配可能在密集匹配中导致模棱两可或丢失的表示形式。在本文中,我们介绍了一种新颖的无探测器本地特征匹配方法Adamatcher,该方法首先通过轻巧的特征交互模块与密集的特征相关联,并估算了配对图像的可见面积,然后执行贴片级多到 - 一个分配可以预测匹配建议,并最终根据一对一的完善模块进行完善。广泛的实验表明,Adamatcher的表现优于固体基线,并在许多下游任务上实现最先进的结果。此外,多对一分配和一对一的完善模块可以用作其他匹配方法(例如Superglue)的改进网络,以进一步提高其性能。代码将在出版时提供。
translated by 谷歌翻译
人类可以利用先前的经验,并从少数示威活动中学习新颖的任务。与旨在通过更好的算法设计来快速适应的离线元强化学习相反,我们研究了建筑归纳偏见对少量学习能力的影响。我们提出了一个基于及时的决策变压器(提示-DT),该变压器利用了变压器体系结构和及时框架的顺序建模能力,以在离线RL中实现少量适应。我们设计了轨迹提示,其中包含少量演示的片段,并编码特定于任务的信息以指导策略生成。我们在五个Mujoco控制基准中进行的实验表明,提示-DT是一个强大的少数学习者,而没有对看不见的目标任务进行任何额外的填充。提示-DT的表现优于其变体和强大的元线RL基线,只有一个轨迹提示符只包含少量时间段。提示-DT也很健壮,可以提示长度更改并可以推广到分布(OOD)环境。
translated by 谷歌翻译
基于学习的多视图立体声(MVS)方法取得了令人印象深刻的进步,并且近年来超越了传统方法。但是,它们的准确性和完整性仍在挣扎。在本文中,我们提出了一种新方法,以增强受对比度学习和功能匹配启发的现有网络的性能。首先,我们提出了一个对比匹配损失(CML),该损失将正确的匹配点视为正样品,将正确的匹配点视为正样本,并将其他点视为阴性样本,并根据特征的相似性计算对比度损失。我们进一步提出了一个加权局灶性损失(WFL),以提高分类能力,从而削弱了根据预测的置信度,在不重要的区域中低信任像素对损失的贡献。在DTU,坦克和寺庙和混合MVS数据集上进行的广泛实验表明,我们的方法可实现最先进的性能,并在基线网络上取得了重大改进。
translated by 谷歌翻译
在本文中,我们基于我们对多视图立体声(MVS)中的特征匹配的探索来呈现TransVSNet。我们将MVS模拟返回其特征匹配任务的性质,因此提出了一个强大的功能匹配变换器(FMT),以利用(自我)和(交叉)关注(交叉)在图像内和跨越图像中聚合的长程上下文信息。为了便于更好地调整FMT,我们利用自适应接收领域(ARF)模块,以确保在特征范围内平滑过境,并使用特征途径桥接不同阶段,以通过不同尺度的转换特征和梯度。此外,我们应用配对特征相关性以测量特征之间的相似性,并采用歧义降低焦损,以加强监管。据我们所知,TransmVSNet首次尝试将变压器利用到MV的任务。因此,我们的方法在DTU数据集,坦克和寺庙基准测试和BlendedMVS数据集中实现了最先进的性能。我们的方法代码将在https://github.com/megviirobot/transmvsnet中提供。
translated by 谷歌翻译
Different people speak with diverse personalized speaking styles. Although existing one-shot talking head methods have made significant progress in lip sync, natural facial expressions, and stable head motions, they still cannot generate diverse speaking styles in the final talking head videos. To tackle this problem, we propose a one-shot style-controllable talking face generation framework. In a nutshell, we aim to attain a speaking style from an arbitrary reference speaking video and then drive the one-shot portrait to speak with the reference speaking style and another piece of audio. Specifically, we first develop a style encoder to extract dynamic facial motion patterns of a style reference video and then encode them into a style code. Afterward, we introduce a style-controllable decoder to synthesize stylized facial animations from the speech content and style code. In order to integrate the reference speaking style into generated videos, we design a style-aware adaptive transformer, which enables the encoded style code to adjust the weights of the feed-forward layers accordingly. Thanks to the style-aware adaptation mechanism, the reference speaking style can be better embedded into synthesized videos during decoding. Extensive experiments demonstrate that our method is capable of generating talking head videos with diverse speaking styles from only one portrait image and an audio clip while achieving authentic visual effects. Project Page: https://github.com/FuxiVirtualHuman/styletalk.
translated by 谷歌翻译
Unmanned aerial vehicle (UAV) swarms are considered as a promising technique for next-generation communication networks due to their flexibility, mobility, low cost, and the ability to collaboratively and autonomously provide services. Distributed learning (DL) enables UAV swarms to intelligently provide communication services, multi-directional remote surveillance, and target tracking. In this survey, we first introduce several popular DL algorithms such as federated learning (FL), multi-agent Reinforcement Learning (MARL), distributed inference, and split learning, and present a comprehensive overview of their applications for UAV swarms, such as trajectory design, power control, wireless resource allocation, user assignment, perception, and satellite communications. Then, we present several state-of-the-art applications of UAV swarms in wireless communication systems, such us reconfigurable intelligent surface (RIS), virtual reality (VR), semantic communications, and discuss the problems and challenges that DL-enabled UAV swarms can solve in these applications. Finally, we describe open problems of using DL in UAV swarms and future research directions of DL enabled UAV swarms. In summary, this survey provides a comprehensive survey of various DL applications for UAV swarms in extensive scenarios.
translated by 谷歌翻译