自动编码器是一种人工神经网络,用于以无监督的方式学习有效的数据编码。自动编码器的目的是通过训练网络忽略信号“噪声”来学习一组数据的表示(编码),通常用于降维。与简化方面一起,学习了重构方面,在此,自动编码器尝试从简化编码中生成尽可能接近其原始输入的表示形式,从而得到其名称。基本模型存在几种变体,其目的是迫使学习的输入表示形式具有有用的属性。自动编码器可有效地解决许多应用问题,从面部识别到获取单词的语义。

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主题: GANs in computer vision: Introduction to generative learning

主要内容: 在这个综述系列文章中,我们将重点讨论计算机视觉应用程序的大量GANs。具体地说,我们将慢慢地建立在导致产生性对抗网络(GAN)进化的思想和原则之上。我们将遇到不同的任务,如条件图像生成,3D对象生成,视频合成。

目录:

  • 对抗学习
  • GAN(生成对抗网络)
  • 条件生成对抗网
  • 基于深度卷积
  • 生成对抗网络的无监督表示学习
  • Info GAN: Info最大化生成对抗网的表征学习

一般来说,数据生成方法存在于各种各样的现代深度学习应用中,从计算机视觉到自然语言处理。在这一点上,我们可以用肉眼生成几乎无法区分的生成数据。生成性学习大致可分为两大类:a)变分自编码器(VAE)和b)生成性对抗网络(GAN)。

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Self-supervised learning methods are gaining increasing traction in computer vision due to their recent success in reducing the gap with supervised learning. In natural language processing (NLP) self-supervised learning and transformers are already the methods of choice. The recent literature suggests that the transformers are becoming increasingly popular also in computer vision. So far, the vision transformers have been shown to work well when pretrained either using a large scale supervised data or with some kind of co-supervision, e.g. in terms of teacher network. These supervised pretrained vision transformers achieve very good results in downstream tasks with minimal changes. In this work we investigate the merits of self-supervised learning for pretraining image/vision transformers and then using them for downstream classification tasks. We propose Self-supervised vIsion Transformers (SiT) and discuss several self-supervised training mechanisms to obtain a pretext model. The architectural flexibility of SiT allows us to use it as an autoencoder and work with multiple self-supervised tasks seamlessly. We show that a pretrained SiT can be finetuned for a downstream classification task on small scale datasets, consisting of a few thousand images rather than several millions. The proposed approach is evaluated on standard datasets using common protocols. The results demonstrate the strength of the transformers and their suitability for self-supervised learning. We outperformed existing self-supervised learning methods by large margin. We also observed that SiT is good for few shot learning and also showed that it is learning useful representation by simply training a linear classifier on top of the learned features from SiT. Pretraining, finetuning, and evaluation codes will be available under: https://github.com/Sara-Ahmed/SiT.

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Self-supervised learning methods are gaining increasing traction in computer vision due to their recent success in reducing the gap with supervised learning. In natural language processing (NLP) self-supervised learning and transformers are already the methods of choice. The recent literature suggests that the transformers are becoming increasingly popular also in computer vision. So far, the vision transformers have been shown to work well when pretrained either using a large scale supervised data or with some kind of co-supervision, e.g. in terms of teacher network. These supervised pretrained vision transformers achieve very good results in downstream tasks with minimal changes. In this work we investigate the merits of self-supervised learning for pretraining image/vision transformers and then using them for downstream classification tasks. We propose Self-supervised vIsion Transformers (SiT) and discuss several self-supervised training mechanisms to obtain a pretext model. The architectural flexibility of SiT allows us to use it as an autoencoder and work with multiple self-supervised tasks seamlessly. We show that a pretrained SiT can be finetuned for a downstream classification task on small scale datasets, consisting of a few thousand images rather than several millions. The proposed approach is evaluated on standard datasets using common protocols. The results demonstrate the strength of the transformers and their suitability for self-supervised learning. We outperformed existing self-supervised learning methods by large margin. We also observed that SiT is good for few shot learning and also showed that it is learning useful representation by simply training a linear classifier on top of the learned features from SiT. Pretraining, finetuning, and evaluation codes will be available under: https://github.com/Sara-Ahmed/SiT.

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