This work introduces alternating latent topologies (ALTO) for high-fidelity reconstruction of implicit 3D surfaces from noisy point clouds. Previous work identifies that the spatial arrangement of latent encodings is important to recover detail. One school of thought is to encode a latent vector for each point (point latents). Another school of thought is to project point latents into a grid (grid latents) which could be a voxel grid or triplane grid. Each school of thought has tradeoffs. Grid latents are coarse and lose high-frequency detail. In contrast, point latents preserve detail. However, point latents are more difficult to decode into a surface, and quality and runtime suffer. In this paper, we propose ALTO to sequentially alternate between geometric representations, before converging to an easy-to-decode latent. We find that this preserves spatial expressiveness and makes decoding lightweight. We validate ALTO on implicit 3D recovery and observe not only a performance improvement over the state-of-the-art, but a runtime improvement of 3-10$\times$. Project website at https://visual.ee.ucla.edu/alto.htm/.
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生成模型已成为许多图像合成和编辑任务的基本构件。该领域的最新进展还使得能够生成具有多视图或时间一致性的高质量3D或视频内容。在我们的工作中,我们探索了学习无条件生成3D感知视频的4D生成对抗网络(GAN)。通过将神经隐式表示与时间感知歧视器相结合,我们开发了一个GAN框架,该框架仅通过单眼视频进行监督的3D视频。我们表明,我们的方法学习了可分解的3D结构和动作的丰富嵌入,这些结构和动作可以使时空渲染的新视觉效果,同时以与现有3D或视频gan相当的质量产生图像。
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Twitter是吸引数百万用户最受欢迎的社交网络之一,而捕获了相当大的在线话语。它提供了一种简单的使用框架,具有短消息和有效的应用程序编程接口(API),使研究界能够学习和分析这一社交网络的几个方面。但是,Twitter使用简单可能会导致各种机器人的恶意处理。恶意处理现象在线话语中扩大,特别是在选举期间,除了用于传播和通信目的的合法机床之外,目标是操纵舆论和选民走向某个方向,特定意识形态或政党。本文侧重于基于标记的Twitter数据来识别Twitter机器的新系统的设计。为此,使用极端梯度升压(XGBoost)算法采用了监督机器学习(ML)框架,其中通过交叉验证调整超参数。我们的研究还通过计算特征重要性,使用基于游戏理论为基础的福价来解释ML模型预测的福利添加剂解释(Shap)。与最近最先进的Twitter机器人检测方法相比,不同的Twitter数据集的实验评估证明了我们的方法的优越性。
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