arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.11902cs.LG
收藏

跨自动编码器架构的分布外数据的几何不稳定性

Geometric instability of out of distribution data across autoencoder architecture

Johns Hopkins University Applied Physics Lab(约翰斯·霍普金斯大学应用物理实验室);Johns Hopking University(约翰斯·霍普金斯大学)

Susama Agarwala, Ben Dees, Corey Lowman

摘要:

我们研究了在MNIST上训练的一系列自动编码器学习的地图,并对根据十种不同分布随机选择像素值创建的十个不同数据集进行了评估。具体来说,我们研究了在每个训练和评估点处由自动编码器的权重矩阵定义的雅可比矩阵的特征值。对于足够高的潜在维度,我们发现每个自动编码器将所有评估数据集重建为相似的\emph{generalized characters},但是这种重建的\emph{generalized character}在自动编码器之间变化。特征值分析表明,即使重建图像似乎是一个MNIST字符的所有分布数据集,并不是所有的潜在表示,接近潜在表示的MNIST字符。总而言之,特征值分析证明了自动编码器的大量几何不稳定性,无论是作为分布输入的函数,还是同一组输入的跨架构。

英文摘要:

We study the map learned by a family of autoencoders trained on MNIST, and evaluated on ten different data sets created by the random selection of pixel values according to ten different distributions. Specifically, we study the eigenvalues of the Jacobians defined by the weight matrices of the autoencoder at each training and evaluation point. For high enough latent dimension, we find that each autoencoder reconstructs all the evaluation data sets as similar \emph{generalized characters}, but that this reconstructed \emph{generalized character} changes across autoencoder. Eigenvalue analysis shows that even when the reconstructed image appears to be an MNIST character for all out of distribution data sets, not all have latent representations that are close to the latent representation of MNIST characters. All told, the eigenvalue analysis demonstrated a great deal of geometric instability of the autoencoder both as a function on out of distribution inputs, and across architectures on the same set of inputs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑