论文标题

深度特征空间:几何视角

Deep Feature Space: A Geometrical Perspective

论文作者

Kansizoglou, Ioannis, Bampis, Loukas, Gasteratos, Antonios

论文摘要

神经网络(NNS)最突出的属性之一构成了他们学习从高维数据(例如图像)中提取强大和描述性特征的能力。因此,这种能力使他们的剥削作为特征提取器,在大量现代推理系统中尤其是频繁。他们的应用程序范围主要包括复杂的级联任务,例如多模式识别和深入强化学习(RL)。但是,NNS引起的隐性偏见很难避免或处理,并且在传统的图像描述符中无法满足。此外,缺乏描述层内特性及其一般行为的知识限制了提取特征的进一步适用性。借助手头的纸,在提出NNS输出层之前可视化和理解向量空间的新颖方式,旨在启发分类任务下的深度特征向量的属性。主要关注特征空间中过度拟合的性质及其对进一步剥削的不利影响。我们介绍了可以从模型的表述中得出的发现,并在现实的识别场景上对它们进行评估,从而通过改善获得的结果来证明其突出性。

One of the most prominent attributes of Neural Networks (NNs) constitutes their capability of learning to extract robust and descriptive features from high dimensional data, like images. Hence, such an ability renders their exploitation as feature extractors particularly frequent in an abundant of modern reasoning systems. Their application scope mainly includes complex cascade tasks, like multi-modal recognition and deep Reinforcement Learning (RL). However, NNs induce implicit biases that are difficult to avoid or to deal with and are not met in traditional image descriptors. Moreover, the lack of knowledge for describing the intra-layer properties -- and thus their general behavior -- restricts the further applicability of the extracted features. With the paper at hand, a novel way of visualizing and understanding the vector space before the NNs' output layer is presented, aiming to enlighten the deep feature vectors' properties under classification tasks. Main attention is paid to the nature of overfitting in the feature space and its adverse effect on further exploitation. We present the findings that can be derived from our model's formulation, and we evaluate them on realistic recognition scenarios, proving its prominence by improving the obtained results.

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