深度神经网络(DNN)已被广泛使用,并在计算机视觉和自动导航领域起着重要作用。但是,这些DNN在计算上是复杂的,并且在没有其他优化和自定义的情况下,它们在资源受限平台上的部署很困难。在本手稿中,我们描述了DNN体系结构的概述,并提出了降低计算复杂性的方法,以加速培训和推理速度,以使其适合具有低计算资源的边缘计算平台。
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这是一门专门针对STEM学生开发的介绍性机器学习课程。我们的目标是为有兴趣的读者提供基础知识,以在自己的项目中使用机器学习,并将自己熟悉术语作为进一步阅读相关文献的基础。在这些讲义中,我们讨论受监督,无监督和强化学习。注释从没有神经网络的机器学习方法的说明开始,例如原理分析,T-SNE,聚类以及线性回归和线性分类器。我们继续介绍基本和先进的神经网络结构,例如密集的进料和常规神经网络,经常性的神经网络,受限的玻尔兹曼机器,(变性)自动编码器,生成的对抗性网络。讨论了潜在空间表示的解释性问题,并使用梦和对抗性攻击的例子。最后一部分致力于加强学习,我们在其中介绍了价值功能和政策学习的基本概念。
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Deep neural networks (DNNs) are currently widely used for many artificial intelligence (AI) applications including computer vision, speech recognition, and robotics. While DNNs deliver state-of-the-art accuracy on many AI tasks, it comes at the cost of high computational complexity. Accordingly, techniques that enable efficient processing of DNNs to improve energy efficiency and throughput without sacrificing application accuracy or increasing hardware cost are critical to the wide deployment of DNNs in AI systems.This article aims to provide a comprehensive tutorial and survey about the recent advances towards the goal of enabling efficient processing of DNNs. Specifically, it will provide an overview of DNNs, discuss various hardware platforms and architectures that support DNNs, and highlight key trends in reducing the computation cost of DNNs either solely via hardware design changes or via joint hardware design and DNN algorithm changes. It will also summarize various development resources that enable researchers and practitioners to quickly get started in this field, and highlight important benchmarking metrics and design considerations that should be used for evaluating the rapidly growing number of DNN hardware designs, optionally including algorithmic co-designs, being proposed in academia and industry.The reader will take away the following concepts from this article: understand the key design considerations for DNNs; be able to evaluate different DNN hardware implementations with benchmarks and comparison metrics; understand the trade-offs between various hardware architectures and platforms; be able to evaluate the utility of various DNN design techniques for efficient processing; and understand recent implementation trends and opportunities.
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The aim of this paper is to introduce a new learning procedure for neural networks and to demonstrate that it works well enough on a few small problems to be worth further investigation. The Forward-Forward algorithm replaces the forward and backward passes of backpropagation by two forward passes, one with positive (i.e. real) data and the other with negative data which could be generated by the network itself. Each layer has its own objective function which is simply to have high goodness for positive data and low goodness for negative data. The sum of the squared activities in a layer can be used as the goodness but there are many other possibilities, including minus the sum of the squared activities. If the positive and negative passes could be separated in time, the negative passes could be done offline, which would make the learning much simpler in the positive pass and allow video to be pipelined through the network without ever storing activities or stopping to propagate derivatives.
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深度学习使用由其重量进行参数化的神经网络。通常通过调谐重量来直接最小化给定损耗功能来训练神经网络。在本文中,我们建议将权重重新参数转化为网络中各个节点的触发强度的目标。给定一组目标,可以计算使得发射强度最佳地满足这些目标的权重。有人认为,通过我们称之为级联解压缩的过程,使用培训的目标解决爆炸梯度的问题,并使损失功能表面更加光滑,因此导致更容易,培训更快,以及潜在的概括,神经网络。它还允许更容易地学习更深层次和经常性的网络结构。目标对重量的必要转换有额外的计算费用,这是在许多情况下可管理的。在目标空间中学习可以与现有的神经网络优化器相结合,以额外收益。实验结果表明了使用目标空间的速度,以及改进的泛化的示例,用于全连接的网络和卷积网络,以及调用和处理长时间序列的能力,并使用经常性网络进行自然语言处理。
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最近,稀疏的培训方法已开始作为事实上的人工神经网络的培训和推理效率的方法。然而,这种效率只是理论上。在实践中,每个人都使用二进制掩码来模拟稀疏性,因为典型的深度学习软件和硬件已针对密集的矩阵操作进行了优化。在本文中,我们采用正交方法,我们表明我们可以训练真正稀疏的神经网络以收获其全部潜力。为了实现这一目标,我们介绍了三个新颖的贡献,这些贡献是专门为稀疏神经网络设计的:(1)平行训练算法及其相应的稀疏实现,(2)具有不可训练的参数的激活功能,以支持梯度流动,以支持梯度流量, (3)隐藏的神经元对消除冗余的重要性指标。总而言之,我们能够打破记录并训练有史以来最大的神经网络在代表力方面训练 - 达到蝙蝠大脑的大小。结果表明,我们的方法具有最先进的表现,同时为环保人工智能时代开辟了道路。
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从物理的角度来看,深度神经网络是其“链接”和“顶点”迭代处理数据并以优选求解任务的图形。我们使用复杂的网络理论(CNT)作为定向的加权图代表深神网络(DNN):在此框架内,我们引入指标将DNN作为动力学系统,其粒度从重量到包括神经元在内的层延伸到层。CNT区分参数和神经元数量不同的网络,隐藏层和激活的类型以及客观任务。我们进一步表明,我们的指标会区分低性能网络。CNT是一种理论DNN的综合方法,也是解释模型行为的互补方法,该方法实际上是基于网络理论的,并且超越了研究良好的输入输出关系。
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这项调查的目的是介绍对深神经网络的近似特性的解释性回顾。具体而言,我们旨在了解深神经网络如何以及为什么要优于其他经典线性和非线性近似方法。这项调查包括三章。在第1章中,我们回顾了深层网络及其组成非线性结构的关键思想和概念。我们通过在解决回归和分类问题时将其作为优化问题来形式化神经网络问题。我们简要讨论用于解决优化问题的随机梯度下降算法以及用于解决优化问题的后传播公式,并解决了与神经网络性能相关的一些问题,包括选择激活功能,成本功能,过度适应问题和正则化。在第2章中,我们将重点转移到神经网络的近似理论上。我们首先介绍多项式近似中的密度概念,尤其是研究实现连续函数的Stone-WeierStrass定理。然后,在线性近似的框架内,我们回顾了馈电网络的密度和收敛速率的一些经典结果,然后在近似Sobolev函数中进行有关深网络复杂性的最新发展。在第3章中,利用非线性近似理论,我们进一步详细介绍了深度和近似网络与其他经典非线性近似方法相比的近似优势。
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神经网络的设计通常是通过定义层数,每层神经元的数量,连接或突触的数量以及它们将执行的激活函数来实现的。培训过程试图优化分配给这些连接的权重,以及神经元的偏见,以更好地适合训练数据。但是,激活功能的定义通常是在设计过程中确定的,而在培训期间未修改,这意味着它们的行为与培训数据集无关。在本文中,我们提出了在训练过程中适应其形状的隐式,参数,非线性激活函数的定义和利用。这一事实增加了参数的空间以在网络中进行优化,但是它允许更大的灵活性并推广神经网络的概念。此外,它简化了架构设计,因为可以在每个神经元中使用相同的激活函数定义,从而使训练过程优化其参数,从而优化其行为。我们提出的激活函数来自通过$ L_P^Q $正则化项的线性不确定问题优化共识变量的定义,该定义是通过乘数的交替方向方法(ADMM)。我们使用这种类型的激活功能将神经网络定义为$ PQ-$网络。初步结果表明,与具有固定激活功能的等效的常规前馈神经网络相比,与等效的常规前馈神经网络相比,这些神经网络与这种自适应激活功能的使用减少了回归和分类示例中的误差。
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Multilayer Neural Networks trained with the backpropagation algorithm constitute the best example of a successful Gradient-Based Learning technique. Given an appropriate network architecture, Gradient-Based Learning algorithms can be used to synthesize a complex decision surface that can classify high-dimensional patterns such as handwritten characters, with minimal preprocessing. This paper reviews various methods applied to handwritten character recognition and compares them on a standard handwritten digit recognition task. Convolutional Neural Networks, that are specifically designed to deal with the variability of 2D shapes, are shown to outperform all other techniques.Real-life document recognition systems are composed of multiple modules including eld extraction, segmentation, recognition, and language modeling. A new learning paradigm, called Graph Transformer Networks (GTN), allows such multi-module systems to be trained globally using Gradient-Based methods so as to minimize an overall performance measure.Two systems for on-line handwriting recognition are described. Experiments demonstrate the advantage of global training, and the exibility of Graph Transformer Networks.A Graph Transformer Network for reading bank check is also described. It uses Convolutional Neural Network character recognizers combined with global training techniques to provides record accuracy on business and personal checks. It is deployed commercially and reads several million checks per day.
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These notes were compiled as lecture notes for a course developed and taught at the University of the Southern California. They should be accessible to a typical engineering graduate student with a strong background in Applied Mathematics. The main objective of these notes is to introduce a student who is familiar with concepts in linear algebra and partial differential equations to select topics in deep learning. These lecture notes exploit the strong connections between deep learning algorithms and the more conventional techniques of computational physics to achieve two goals. First, they use concepts from computational physics to develop an understanding of deep learning algorithms. Not surprisingly, many concepts in deep learning can be connected to similar concepts in computational physics, and one can utilize this connection to better understand these algorithms. Second, several novel deep learning algorithms can be used to solve challenging problems in computational physics. Thus, they offer someone who is interested in modeling a physical phenomena with a complementary set of tools.
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Deep learning takes advantage of large datasets and computationally efficient training algorithms to outperform other approaches at various machine learning tasks. However, imperfections in the training phase of deep neural networks make them vulnerable to adversarial samples: inputs crafted by adversaries with the intent of causing deep neural networks to misclassify. In this work, we formalize the space of adversaries against deep neural networks (DNNs) and introduce a novel class of algorithms to craft adversarial samples based on a precise understanding of the mapping between inputs and outputs of DNNs. In an application to computer vision, we show that our algorithms can reliably produce samples correctly classified by human subjects but misclassified in specific targets by a DNN with a 97% adversarial success rate while only modifying on average 4.02% of the input features per sample. We then evaluate the vulnerability of different sample classes to adversarial perturbations by defining a hardness measure. Finally, we describe preliminary work outlining defenses against adversarial samples by defining a predictive measure of distance between a benign input and a target classification.
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近年来,机器学习的巨大进步已经开始对许多科学和技术的许多领域产生重大影响。在本文的文章中,我们探讨了量子技术如何从这项革命中受益。我们在说明性示例中展示了过去几年的科学家如何开始使用机器学习和更广泛的人工智能方法来分析量子测量,估计量子设备的参数,发现新的量子实验设置,协议和反馈策略,以及反馈策略,以及通常改善量子计算,量子通信和量子模拟的各个方面。我们重点介绍了公开挑战和未来的可能性,并在未来十年的一些投机愿景下得出结论。
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与神经网络的软件模拟相反,硬件实现通常有限或没有可调性。尽管此类网络在速度和能源效率方面有了很大的改善,但它们的性能受到应用有效培训的困难的限制。我们建议并实现实验性的光学系统,在该系统中,可以通过一系列高度非线性的,不可调节的节点来应用高效的反向传播训练。该系统包括实现非线性激活函数的激子孔节点。我们在单个隐藏层系统中的MNIST手写数字基准中演示了高分类精度。
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我们将零温度的大都市蒙特卡洛算法作为通过最大程度地减少损失函数来训练神经网络的工具。我们发现,正如理论上的预期,并在其他作者的经验上表现出来,Metropolis Monte Carlo可以训练具有与梯度下降相当的准确性(即使不一定那么快)的准确性。当神经网络的参数数量较大时,大都市算法不会自动失败。当神经网络的结构或神经元激活是强大的异质性时,它可能会失败,并且我们引入了一种自适应的蒙特卡洛算法AMC来克服这些局限性。 Monte Carlo方法的内在随机性和数值稳定性使AMC可以训练深层神经网络和经常性的神经网络,其中梯度太小或太大,无法通过梯度下降进行训练。 Monte Carlo方法为培训神经网络的基于梯度的方法提供了补充,从而可以访问一组不同的网络架构和原理。
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Alphazero,Leela Chess Zero和Stockfish Nnue革新了计算机国际象棋。本书对此类引擎的技术内部工作进行了完整的介绍。该书分为四个主要章节 - 不包括第1章(简介)和第6章(结论):第2章引入神经网络,涵盖了所有用于构建深层网络的基本构建块,例如Alphazero使用的网络。内容包括感知器,后传播和梯度下降,分类,回归,多层感知器,矢量化技术,卷积网络,挤压网络,挤压和激发网络,完全连接的网络,批处理归一化和横向归一化和跨性线性单位,残留层,剩余层,过度效果和底漆。第3章介绍了用于国际象棋发动机以及Alphazero使用的经典搜索技术。内容包括minimax,alpha-beta搜索和蒙特卡洛树搜索。第4章展示了现代国际象棋发动机的设计。除了开创性的Alphago,Alphago Zero和Alphazero我们涵盖Leela Chess Zero,Fat Fritz,Fat Fritz 2以及有效更新的神经网络(NNUE)以及MAIA。第5章是关于实施微型α。 Shexapawn是国际象棋的简约版本,被用作为此的示例。 Minimax搜索可以解决六ap峰,并产生了监督学习的培训位置。然后,作为比较,实施了类似Alphazero的训练回路,其中通过自我游戏进行训练与强化学习结合在一起。最后,比较了类似α的培训和监督培训。
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天然气管道中的泄漏检测是石油和天然气行业的一个重要且持续的问题。这尤其重要,因为管道是运输天然气的最常见方法。这项研究旨在研究数据驱动的智能模型使用基本操作参数检测天然气管道的小泄漏的能力,然后使用现有的性能指标比较智能模型。该项目应用观察者设计技术,使用回归分类层次模型来检测天然气管道中的泄漏,其中智能模型充当回归器,并且修改后的逻辑回归模型充当分类器。该项目使用四个星期的管道数据流研究了五个智能模型(梯度提升,决策树,随机森林,支持向量机和人工神经网络)。结果表明,虽然支持向量机和人工神经网络比其他网络更好,但由于其内部复杂性和所使用的数据量,它们并未提供最佳的泄漏检测结果。随机森林和决策树模型是最敏感的,因为它们可以在大约2小时内检测到标称流量的0.1%的泄漏。所有智能模型在测试阶段中具有高可靠性,错误警报率为零。将所有智能模型泄漏检测的平均时间与文献中的实时短暂模型进行了比较。结果表明,智能模型在泄漏检测问题中的表现相对较好。该结果表明,可以与实时瞬态模型一起使用智能模型,以显着改善泄漏检测结果。
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驱动深度学习成功的反向传播很可能与大脑的学习机制不同。在本文中,我们制定了一项受生物学启发的学习规则,该规则在HEBB著名的建议的想法之后,发现了当地竞争的特征。已经证明,该本地学习规则所学的无监督功能可以作为培训模型,以提高某些监督学习任务的绩效。更重要的是,该本地学习规则使我们能够构建一个与返回传播完全不同的新学习范式,该范式命名为激活学习,其中神经网络的输出激活大致衡量了输入模式的可能性。激活学习能够从几乎没有输入模式的几镜头中学习丰富的本地特征,并且当训练样本的数量相对较小时,比反向传播算法表现出明显更好的性能。这种学习范式统一了无监督的学习,监督的学习和生成模型,并且更安全地抵抗对抗性攻击,为建立一般任务神经网络的某些可能性铺平了道路。
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Models of sensory processing and learning in the cortex need to efficiently assign credit to synapses in all areas. In deep learning, a known solution is error backpropagation, which however requires biologically implausible weight transport from feed-forward to feedback paths. We introduce Phaseless Alignment Learning (PAL), a bio-plausible method to learn efficient feedback weights in layered cortical hierarchies. This is achieved by exploiting the noise naturally found in biophysical systems as an additional carrier of information. In our dynamical system, all weights are learned simultaneously with always-on plasticity and using only information locally available to the synapses. Our method is completely phase-free (no forward and backward passes or phased learning) and allows for efficient error propagation across multi-layer cortical hierarchies, while maintaining biologically plausible signal transport and learning. Our method is applicable to a wide class of models and improves on previously known biologically plausible ways of credit assignment: compared to random synaptic feedback, it can solve complex tasks with less neurons and learn more useful latent representations. We demonstrate this on various classification tasks using a cortical microcircuit model with prospective coding.
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海洋生态系统及其鱼类栖息地越来越重要,因为它们在提供有价值的食物来源和保护效果方面的重要作用。由于它们的偏僻且难以接近自然,因此通常使用水下摄像头对海洋环境和鱼类栖息地进行监测。这些相机产生了大量数字数据,这些数据无法通过当前的手动处理方法有效地分析,这些方法涉及人类观察者。 DL是一种尖端的AI技术,在分析视觉数据时表现出了前所未有的性能。尽管它应用于无数领域,但仍在探索其在水下鱼类栖息地监测中的使用。在本文中,我们提供了一个涵盖DL的关键概念的教程,该教程可帮助读者了解对DL的工作原理的高级理解。该教程还解释了一个逐步的程序,讲述了如何为诸如水下鱼类监测等挑战性应用开发DL算法。此外,我们还提供了针对鱼类栖息地监测的关键深度学习技术的全面调查,包括分类,计数,定位和细分。此外,我们对水下鱼类数据集进行了公开调查,并比较水下鱼类监测域中的各种DL技术。我们还讨论了鱼类栖息地加工深度学习的新兴领域的一些挑战和机遇。本文是为了作为希望掌握对DL的高级了解,通过遵循我们的分步教程而为其应用开发的海洋科学家的教程,并了解如何发展其研究,以促进他们的研究。努力。同时,它适用于希望调查基于DL的最先进方法的计算机科学家,以进行鱼类栖息地监测。
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