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UFLDL实验报告2:Sparse Autoencoder
Sparse Autoencoder稀疏自编码器实验报告1.Sparse Autoencoder稀疏自编码器实验描述 自编码神经网络是一种无监督学习算法,它使用了反向传播算法,并让目标值等于输入值,比如 。自编码神经网络尝试学习一个 的函数。换句话说,它尝试逼近一个恒等函数,从而使得输出 接近于.....
分类:Web程序   时间:2014-10-17 00:19:13    阅读次数:583
稀疏模型与结构性稀疏模型
稀疏编码系列:(一)----Spatial Pyramid 小结(二)----图像的稀疏表示——ScSPM和LLC的总结(三)----理解sparse coding(四)----稀疏模型与结构性稀疏模型-------------------------------------------------...
分类:其他好文   时间:2014-10-14 13:41:48    阅读次数:233
Linear Spatial Pyramid Matching Using Sparse Coding for Image Classification
引入 Recently SVMs using spatial pyramid matching (SPM) kernel have been highly successful in image classification. Despite its popularity, these nonlin...
分类:其他好文   时间:2014-10-02 23:06:13    阅读次数:917
Sparse Coding: Autoencoder Interpretation
稀疏编码在稀疏自编码算法中,我们试着学习得到一组权重参数 W(以及相应的截距 b),通过这些参数可以使我们得到稀疏特征向量 σ(Wx + b) ,这些特征向量对于重构输入样本非常有用。稀疏编码可以看作是稀疏自编码方法的一个变形,该方法试图直接学习数据的特征集。利用与此特征集相应的基向量,将学习得到的...
分类:其他好文   时间:2014-09-19 21:00:16    阅读次数:400
Sparse Coding
Sparse CodingSparse coding is a class of unsupervised methods for learning sets of over-complete bases to represent data efficiently. —— 过完备的基,无监督 The...
分类:其他好文   时间:2014-09-19 18:57:05    阅读次数:272
Feature extraction using convolution
Fully Connected NetworksIn the sparse autoencoder, one design choice that we had made was to "fully connect" all the hidden units to all the input uni...
分类:其他好文   时间:2014-09-19 17:02:25    阅读次数:238
Linear Decoders
Sparse Autoencoder RecapIn the sparse autoencoder, we had 3 layers of neurons: an input layer, a hidden layer and an output layer. In our previous des...
分类:其他好文   时间:2014-09-19 17:00:55    阅读次数:251
Sparse Autoencoder(二)
Gradient checking and advanced optimizationIn this section, we describe a method for numerically checking the derivatives computed by your code to mak...
分类:其他好文   时间:2014-09-18 16:28:14    阅读次数:305
Sparse Autoencoder(一)
Neural NetworksWe will use the following diagram to denote a single neuron:This "neuron" is a computational unit that takes as input x1,x2,x3 (and a +...
分类:其他好文   时间:2014-09-18 11:05:43    阅读次数:418
Exercise : Self-Taught Learning
First, you will train your sparse autoencoder on an "unlabeled" training dataset of handwritten digits. This produces feature that are penstroke-like....
分类:其他好文   时间:2014-09-16 17:20:10    阅读次数:557
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