The paper proposes Factor-VAE, which aims to learn disentangled representations in an unsupervised manner. Factor-VAE enhances disentanglement over the β-VAE by encouraging the latent distribution to be factorial (independent across dimensions) using a total correlation penalty. This penalty is optimized using a discriminator network. Experiments on various datasets show that Factor-VAE achieves better disentanglement than β-VAE, as measured by a proposed disentanglement metric, while maintaining good reconstruction quality. Latent traversals qualitatively demonstrate disentangled factors of variation.
Emily Denton - Unsupervised Learning of Disentangled Representations from Vid...Luba Elliott
This talk by Emily Denton from New York University on "Unsupervised Learning of Disentangled Representations from Video" was presented at the Learning Image Representations event on 30th August at Twitter as part of the Creative AI meetup.
Disentangled Representation Learning of Deep Generative ModelsRyohei Suzuki
This document discusses disentangled representation learning in deep generative models. It explains that generative models can generate realistic images but it is difficult to control specific attributes of the generated images. Recent research aims to learn disentangled representations where each latent variable corresponds to an independent perceptual factor, such as object pose or color. Methods described include InfoGAN, β-VAE, spatial conditional batch normalization, hierarchical latent variables, and StyleGAN's hierarchical modulation approach. Measuring entanglement through perceptual path length and linear separability is also discussed. The document suggests disentangled representation learning could help applications in biology and medicine by providing better explanatory variables for complex phenomena.
Diffusion models beat gans on image synthesisBeerenSahu
Diffusion models have recently been shown to produce higher quality images than GANs while also offering better diversity and being easier to scale and train. Specifically, a 2021 paper by OpenAI demonstrated that a diffusion model achieved an FID score of 2.97 on ImageNet 128x128, beating the previous state-of-the-art held by BigGAN. Diffusion models work by gradually adding noise to images in a forward process and then learning to remove noise in a backward denoising process, allowing them to generate diverse, high fidelity images.
Toward Disentanglement through Understand ELBOKai-Wen Zhao
Disentangled representation is the holy grail for representation learning which factorizes human-understandable factors in unsupervised way what help us move forward to interpretable machine learning.
Slides by Víctor Garcia about the paper:
Reed, Scott, Zeynep Akata, Xinchen Yan, Lajanugen Logeswaran, Bernt Schiele, and Honglak Lee. "Generative adversarial text to image synthesis." ICML 2016.
Emily Denton - Unsupervised Learning of Disentangled Representations from Vid...Luba Elliott
This talk by Emily Denton from New York University on "Unsupervised Learning of Disentangled Representations from Video" was presented at the Learning Image Representations event on 30th August at Twitter as part of the Creative AI meetup.
Disentangled Representation Learning of Deep Generative ModelsRyohei Suzuki
This document discusses disentangled representation learning in deep generative models. It explains that generative models can generate realistic images but it is difficult to control specific attributes of the generated images. Recent research aims to learn disentangled representations where each latent variable corresponds to an independent perceptual factor, such as object pose or color. Methods described include InfoGAN, β-VAE, spatial conditional batch normalization, hierarchical latent variables, and StyleGAN's hierarchical modulation approach. Measuring entanglement through perceptual path length and linear separability is also discussed. The document suggests disentangled representation learning could help applications in biology and medicine by providing better explanatory variables for complex phenomena.
Diffusion models beat gans on image synthesisBeerenSahu
Diffusion models have recently been shown to produce higher quality images than GANs while also offering better diversity and being easier to scale and train. Specifically, a 2021 paper by OpenAI demonstrated that a diffusion model achieved an FID score of 2.97 on ImageNet 128x128, beating the previous state-of-the-art held by BigGAN. Diffusion models work by gradually adding noise to images in a forward process and then learning to remove noise in a backward denoising process, allowing them to generate diverse, high fidelity images.
Toward Disentanglement through Understand ELBOKai-Wen Zhao
Disentangled representation is the holy grail for representation learning which factorizes human-understandable factors in unsupervised way what help us move forward to interpretable machine learning.
Slides by Víctor Garcia about the paper:
Reed, Scott, Zeynep Akata, Xinchen Yan, Lajanugen Logeswaran, Bernt Schiele, and Honglak Lee. "Generative adversarial text to image synthesis." ICML 2016.
Generative Adversarial Networks (GANs) - Ian Goodfellow, OpenAIWithTheBest
This is how Generative Adversarial Networks (GANs) work and benefit the tech and dev industry. Although GANs still have room for improvement, GANs are important generative models that learn how to create realistic samples.
GANS
Ian Goodfellow, OpenAI Research Scientist
GANs are the new hottest topic in the ML arena; however, they present a challenge for the researchers and the engineers alike. Their design, and most importantly, the code implementation has been causing headaches to the ML practitioners, especially when moving to production.
Starting from the very basic of what a GAN is, passing trough Tensorflow implementation, using the most cutting-edge APIs available in the framework, and finally, production-ready serving at scale using Google Cloud ML Engine.
Slides for the talk: https://www.pycon.it/conference/talks/deep-diving-into-gans-form-theory-to-production
Github repo: https://github.com/zurutech/gans-from-theory-to-production
UMAP is a technique for dimensionality reduction that was proposed 2 years ago that quickly gained widespread usage for dimensionality reduction.
In this presentation I will try to demistyfy UMAP by comparing it to tSNE. I also sketch its theoretical background in topology and fuzzy sets.
Generative adversarial networks (GANs) use two neural networks, a generator and discriminator, that compete against each other. The generator aims to produce realistic samples to fool the discriminator, while the discriminator tries to distinguish real samples from generated ones. This adversarial training can produce high-quality, sharp samples but is challenging to train as the generator and discriminator must be carefully balanced.
[Paper Reading] Attention is All You NeedDaiki Tanaka
The document summarizes the "Attention Is All You Need" paper, which introduced the Transformer model for natural language processing. The Transformer uses attention mechanisms rather than recurrent or convolutional layers, allowing for more parallelization. It achieved state-of-the-art results in machine translation tasks using techniques like multi-head attention, positional encoding, and beam search decoding. The paper demonstrated the Transformer's ability to draw global dependencies between input and output with constant computational complexity.
This document discusses nonparametric pattern recognition techniques, including density estimation methods like Parzen windows and the k-nearest neighbors algorithm. It covers density estimation, using Parzen windows to estimate densities without assuming a known form, and provides examples of applying Parzen windows to both classification and estimating mixtures of unknown densities from sample data. Probabilistic neural networks are also introduced as a parallel implementation of Parzen window density estimation.
Slides presented in the All Japan Computer Vision Study Group on May 15, 2022. Methods for disentangling the relationship between multimodal data are discussed.
Unsupervised learning representation with Deep Convolutional Generative Adversarial Network, Paper by Alec Radford, Luke Metz, and Soumith Chintala
(indico Research, Facebook AI Research).
Generative Adversarial Networks (GANs) are a type of deep learning algorithm that use two neural networks - a generator and discriminator. The generator produces new data samples and the discriminator tries to determine whether samples are real or generated. The networks train simultaneously, with the generator trying to produce realistic samples and the discriminator accurately classifying samples. GANs can generate high-quality, realistic data and have applications such as image synthesis, but training can be unstable and outputs may be biased.
1D Convolutional Neural Networks for Time Series Modeling - Nathan Janos, Jef...PyData
This talk describes an experimental approach to time series modeling using 1D convolution filter layers in a neural network architecture. This approach was developed at System1 for forecasting marketplace value of online advertising categories.
Variational Autoencoders For Image GenerationJason Anderson
Meetup: https://www.meetup.com/Cognitive-Computing-Enthusiasts/events/260580395/
Video: https://www.youtube.com/watch?v=fnULFOyNZn8
Blog: http://www.compthree.com/blog/autoencoder/
Code: https://github.com/compthree/variational-autoencoder
An autoencoder is a machine learning algorithm that represents unlabeled high-dimensional data as points in a low-dimensional space. A variational autoencoder (VAE) is an autoencoder that represents unlabeled high-dimensional data as low-dimensional probability distributions. In addition to data compression, the randomness of the VAE algorithm gives it a second powerful feature: the ability to generate new data similar to its training data. For example, a VAE trained on images of faces can generate a compelling image of a new "fake" face. It can also map new features onto input data, such as glasses or a mustache onto the image of a face that initially lacks these features. In this talk, we will survey VAE model designs that use deep learning, and we will implement a basic VAE in TensorFlow. We will also demonstrate the encoding and generative capabilities of VAEs and discuss their industry applications.
The document discusses optimal transport and its applications to color transfer for images. It introduces discrete and continuous optimal transport, which finds the optimal way of transferring mass between distributions to minimize cost. This allows computing distances between distributions and projecting images to match color statistics. Specifically, it describes using sliced Wasserstein projections to transfer the color distribution of a source image to match that of a style image. This modified color transfer method preserves the spatial structure of the source image better than traditional histogram equalization.
Generative Adversarial Networks (GANs) are a type of deep learning model used for unsupervised machine learning tasks like image generation. GANs work by having two neural networks, a generator and discriminator, compete against each other. The generator creates synthetic images and the discriminator tries to distinguish real images from fake ones. This allows the generator to improve over time at creating more realistic images that can fool the discriminator. The document discusses the intuition behind GANs, provides a PyTorch implementation example, and describes variants like DCGAN, LSGAN, and semi-supervised GANs.
This tutorial provides an overview of recent advances in deep generative models. It will cover three types of generative models: Markov models, latent variable models, and implicit models. The tutorial aims to give attendees a full understanding of the latest developments in generative modeling and how these models can be applied to high-dimensional data. Several challenges and open questions in the field will also be discussed. The tutorial is intended for the 2017 conference of the International Society for Bayesian Analysis.
The document discusses the Sinkhorn algorithm for optimal transport. It describes how the Sinkhorn algorithm can be used to find the optimal transport plan between distributions by iteratively applying linear operations. It also introduces the GeomLoss Python library for using Sinkhorn divergences and mentions applications of Sinkhorn for latent permutations and solving jigsaw puzzles.
Research Trends in Editing image using GAN (TAGAN, Editable GAN)DaeJin Kim
The document summarizes research on using generative adversarial networks (GANs) to edit images using text. It discusses Text-Adaptive GAN, which can manipulate images based on natural language descriptions, and Editable GAN, which can simultaneously generate and edit faces. It then proposes a model called Editable Text-Adaptive GAN that combines aspects of these two models to allow generating and editing images using natural language descriptions. Key aspects discussed include the model structure, use of a connection network and text-adaptive discriminator, and potential limitations and areas for improvement.
A simple framework for contrastive learning of visual representationsDevansh16
Link: https://machine-learning-made-simple.medium.com/learnings-from-simclr-a-framework-contrastive-learning-for-visual-representations-6c145a5d8e99
If you'd like to discuss something, text me on LinkedIn, IG, or Twitter. To support me, please use my referral link to Robinhood. It's completely free, and we both get a free stock. Not using it is literally losing out on free money.
Check out my other articles on Medium. : https://rb.gy/zn1aiu
My YouTube: https://rb.gy/88iwdd
Reach out to me on LinkedIn. Let's connect: https://rb.gy/m5ok2y
My Instagram: https://rb.gy/gmvuy9
My Twitter: https://twitter.com/Machine01776819
My Substack: https://devanshacc.substack.com/
Live conversations at twitch here: https://rb.gy/zlhk9y
Get a free stock on Robinhood: https://join.robinhood.com/fnud75
This paper presents SimCLR: a simple framework for contrastive learning of visual representations. We simplify recently proposed contrastive self-supervised learning algorithms without requiring specialized architectures or a memory bank. In order to understand what enables the contrastive prediction tasks to learn useful representations, we systematically study the major components of our framework. We show that (1) composition of data augmentations plays a critical role in defining effective predictive tasks, (2) introducing a learnable nonlinear transformation between the representation and the contrastive loss substantially improves the quality of the learned representations, and (3) contrastive learning benefits from larger batch sizes and more training steps compared to supervised learning. By combining these findings, we are able to considerably outperform previous methods for self-supervised and semi-supervised learning on ImageNet. A linear classifier trained on self-supervised representations learned by SimCLR achieves 76.5% top-1 accuracy, which is a 7% relative improvement over previous state-of-the-art, matching the performance of a supervised ResNet-50. When fine-tuned on only 1% of the labels, we achieve 85.8% top-5 accuracy, outperforming AlexNet with 100X fewer labels.
Comments: ICML'2020. Code and pretrained models at this https URL
Subjects: Machine Learning (cs.LG); Computer Vision and Pattern Recognition (cs.CV); Machine Learning (stat.ML)
Cite as: arXiv:2002.05709 [cs.LG]
(or arXiv:2002.05709v3 [cs.LG] for this version)
Submission history
From: Ting Chen [view email]
[v1] Thu, 13 Feb 2020 18:50:45 UTC (5,093 KB)
[v2] Mon, 30 Mar 2020 15:32:51 UTC (5,047 KB)
[v3] Wed, 1 Jul 2020 00:09:08 UTC (5,829 KB)
This document provides practice exercises related to foundational concepts in statistics including: defining key terms; computing descriptive statistics like mean, median, mode, and range; generating frequency distributions and histograms; computing z-scores, percentiles, and confidence intervals; and defining relationships between statistical concepts. The exercises are intended to help students learn terminology and calculations involved in quantitative data analysis and drawing statistical inferences from samples.
Generative Adversarial Networks (GANs) - Ian Goodfellow, OpenAIWithTheBest
This is how Generative Adversarial Networks (GANs) work and benefit the tech and dev industry. Although GANs still have room for improvement, GANs are important generative models that learn how to create realistic samples.
GANS
Ian Goodfellow, OpenAI Research Scientist
GANs are the new hottest topic in the ML arena; however, they present a challenge for the researchers and the engineers alike. Their design, and most importantly, the code implementation has been causing headaches to the ML practitioners, especially when moving to production.
Starting from the very basic of what a GAN is, passing trough Tensorflow implementation, using the most cutting-edge APIs available in the framework, and finally, production-ready serving at scale using Google Cloud ML Engine.
Slides for the talk: https://www.pycon.it/conference/talks/deep-diving-into-gans-form-theory-to-production
Github repo: https://github.com/zurutech/gans-from-theory-to-production
UMAP is a technique for dimensionality reduction that was proposed 2 years ago that quickly gained widespread usage for dimensionality reduction.
In this presentation I will try to demistyfy UMAP by comparing it to tSNE. I also sketch its theoretical background in topology and fuzzy sets.
Generative adversarial networks (GANs) use two neural networks, a generator and discriminator, that compete against each other. The generator aims to produce realistic samples to fool the discriminator, while the discriminator tries to distinguish real samples from generated ones. This adversarial training can produce high-quality, sharp samples but is challenging to train as the generator and discriminator must be carefully balanced.
[Paper Reading] Attention is All You NeedDaiki Tanaka
The document summarizes the "Attention Is All You Need" paper, which introduced the Transformer model for natural language processing. The Transformer uses attention mechanisms rather than recurrent or convolutional layers, allowing for more parallelization. It achieved state-of-the-art results in machine translation tasks using techniques like multi-head attention, positional encoding, and beam search decoding. The paper demonstrated the Transformer's ability to draw global dependencies between input and output with constant computational complexity.
This document discusses nonparametric pattern recognition techniques, including density estimation methods like Parzen windows and the k-nearest neighbors algorithm. It covers density estimation, using Parzen windows to estimate densities without assuming a known form, and provides examples of applying Parzen windows to both classification and estimating mixtures of unknown densities from sample data. Probabilistic neural networks are also introduced as a parallel implementation of Parzen window density estimation.
Slides presented in the All Japan Computer Vision Study Group on May 15, 2022. Methods for disentangling the relationship between multimodal data are discussed.
Unsupervised learning representation with Deep Convolutional Generative Adversarial Network, Paper by Alec Radford, Luke Metz, and Soumith Chintala
(indico Research, Facebook AI Research).
Generative Adversarial Networks (GANs) are a type of deep learning algorithm that use two neural networks - a generator and discriminator. The generator produces new data samples and the discriminator tries to determine whether samples are real or generated. The networks train simultaneously, with the generator trying to produce realistic samples and the discriminator accurately classifying samples. GANs can generate high-quality, realistic data and have applications such as image synthesis, but training can be unstable and outputs may be biased.
1D Convolutional Neural Networks for Time Series Modeling - Nathan Janos, Jef...PyData
This talk describes an experimental approach to time series modeling using 1D convolution filter layers in a neural network architecture. This approach was developed at System1 for forecasting marketplace value of online advertising categories.
Variational Autoencoders For Image GenerationJason Anderson
Meetup: https://www.meetup.com/Cognitive-Computing-Enthusiasts/events/260580395/
Video: https://www.youtube.com/watch?v=fnULFOyNZn8
Blog: http://www.compthree.com/blog/autoencoder/
Code: https://github.com/compthree/variational-autoencoder
An autoencoder is a machine learning algorithm that represents unlabeled high-dimensional data as points in a low-dimensional space. A variational autoencoder (VAE) is an autoencoder that represents unlabeled high-dimensional data as low-dimensional probability distributions. In addition to data compression, the randomness of the VAE algorithm gives it a second powerful feature: the ability to generate new data similar to its training data. For example, a VAE trained on images of faces can generate a compelling image of a new "fake" face. It can also map new features onto input data, such as glasses or a mustache onto the image of a face that initially lacks these features. In this talk, we will survey VAE model designs that use deep learning, and we will implement a basic VAE in TensorFlow. We will also demonstrate the encoding and generative capabilities of VAEs and discuss their industry applications.
The document discusses optimal transport and its applications to color transfer for images. It introduces discrete and continuous optimal transport, which finds the optimal way of transferring mass between distributions to minimize cost. This allows computing distances between distributions and projecting images to match color statistics. Specifically, it describes using sliced Wasserstein projections to transfer the color distribution of a source image to match that of a style image. This modified color transfer method preserves the spatial structure of the source image better than traditional histogram equalization.
Generative Adversarial Networks (GANs) are a type of deep learning model used for unsupervised machine learning tasks like image generation. GANs work by having two neural networks, a generator and discriminator, compete against each other. The generator creates synthetic images and the discriminator tries to distinguish real images from fake ones. This allows the generator to improve over time at creating more realistic images that can fool the discriminator. The document discusses the intuition behind GANs, provides a PyTorch implementation example, and describes variants like DCGAN, LSGAN, and semi-supervised GANs.
This tutorial provides an overview of recent advances in deep generative models. It will cover three types of generative models: Markov models, latent variable models, and implicit models. The tutorial aims to give attendees a full understanding of the latest developments in generative modeling and how these models can be applied to high-dimensional data. Several challenges and open questions in the field will also be discussed. The tutorial is intended for the 2017 conference of the International Society for Bayesian Analysis.
The document discusses the Sinkhorn algorithm for optimal transport. It describes how the Sinkhorn algorithm can be used to find the optimal transport plan between distributions by iteratively applying linear operations. It also introduces the GeomLoss Python library for using Sinkhorn divergences and mentions applications of Sinkhorn for latent permutations and solving jigsaw puzzles.
Research Trends in Editing image using GAN (TAGAN, Editable GAN)DaeJin Kim
The document summarizes research on using generative adversarial networks (GANs) to edit images using text. It discusses Text-Adaptive GAN, which can manipulate images based on natural language descriptions, and Editable GAN, which can simultaneously generate and edit faces. It then proposes a model called Editable Text-Adaptive GAN that combines aspects of these two models to allow generating and editing images using natural language descriptions. Key aspects discussed include the model structure, use of a connection network and text-adaptive discriminator, and potential limitations and areas for improvement.
A simple framework for contrastive learning of visual representationsDevansh16
Link: https://machine-learning-made-simple.medium.com/learnings-from-simclr-a-framework-contrastive-learning-for-visual-representations-6c145a5d8e99
If you'd like to discuss something, text me on LinkedIn, IG, or Twitter. To support me, please use my referral link to Robinhood. It's completely free, and we both get a free stock. Not using it is literally losing out on free money.
Check out my other articles on Medium. : https://rb.gy/zn1aiu
My YouTube: https://rb.gy/88iwdd
Reach out to me on LinkedIn. Let's connect: https://rb.gy/m5ok2y
My Instagram: https://rb.gy/gmvuy9
My Twitter: https://twitter.com/Machine01776819
My Substack: https://devanshacc.substack.com/
Live conversations at twitch here: https://rb.gy/zlhk9y
Get a free stock on Robinhood: https://join.robinhood.com/fnud75
This paper presents SimCLR: a simple framework for contrastive learning of visual representations. We simplify recently proposed contrastive self-supervised learning algorithms without requiring specialized architectures or a memory bank. In order to understand what enables the contrastive prediction tasks to learn useful representations, we systematically study the major components of our framework. We show that (1) composition of data augmentations plays a critical role in defining effective predictive tasks, (2) introducing a learnable nonlinear transformation between the representation and the contrastive loss substantially improves the quality of the learned representations, and (3) contrastive learning benefits from larger batch sizes and more training steps compared to supervised learning. By combining these findings, we are able to considerably outperform previous methods for self-supervised and semi-supervised learning on ImageNet. A linear classifier trained on self-supervised representations learned by SimCLR achieves 76.5% top-1 accuracy, which is a 7% relative improvement over previous state-of-the-art, matching the performance of a supervised ResNet-50. When fine-tuned on only 1% of the labels, we achieve 85.8% top-5 accuracy, outperforming AlexNet with 100X fewer labels.
Comments: ICML'2020. Code and pretrained models at this https URL
Subjects: Machine Learning (cs.LG); Computer Vision and Pattern Recognition (cs.CV); Machine Learning (stat.ML)
Cite as: arXiv:2002.05709 [cs.LG]
(or arXiv:2002.05709v3 [cs.LG] for this version)
Submission history
From: Ting Chen [view email]
[v1] Thu, 13 Feb 2020 18:50:45 UTC (5,093 KB)
[v2] Mon, 30 Mar 2020 15:32:51 UTC (5,047 KB)
[v3] Wed, 1 Jul 2020 00:09:08 UTC (5,829 KB)
This document provides practice exercises related to foundational concepts in statistics including: defining key terms; computing descriptive statistics like mean, median, mode, and range; generating frequency distributions and histograms; computing z-scores, percentiles, and confidence intervals; and defining relationships between statistical concepts. The exercises are intended to help students learn terminology and calculations involved in quantitative data analysis and drawing statistical inferences from samples.
Random Matrix Theory and Machine Learning - Part 4Fabian Pedregosa
Deep learning models with millions or billions of parameters should overfit according to classical theory, but they do not. The emerging theory of double descent seeks to explain why larger neural networks can generalize well. Random matrix theory provides a tractable framework to model double descent through random feature models, where the number of random features controls model capacity. In the high-dimensional limit, the test error of random feature regression exhibits a double descent shape that can be computed analytically.
Big Data analysis involves building predictive models from high-dimensional data using techniques like variable selection, cross-validation, and regularization to avoid overfitting. The document discusses an example analyzing web browsing data to predict online spending, highlighting challenges with large numbers of variables. It also covers summarizing high-dimensional data through dimension reduction and model building for prediction versus causal inference.
This document presents an exponential-Lindley additive failure rate model (ELAFRM) by combining the hazard functions of an exponential distribution and a Lindley distribution. The key properties of the ELAFRM are derived, including the probability density function, cumulative distribution function, hazard function, moments, and graphical representations. Estimation of the model parameters is also discussed. The document proposes this new ELAFRM distribution and analyzes its mathematical properties.
Xi Zhang presented their Ph.D. dissertation which analyzed functional regression models and their application to high-frequency financial data. The presentation included:
1. An introduction to functional data analysis and the use of intraday cumulative return curves from stock price data.
2. A simulation study comparing predictive methods in functional autoregressive models, finding the estimated kernel method performed well.
3. An application of functional extensions of the Capital Asset Pricing Model to predict intraday return curves, finding simpler models with intercepts had better predictive performance than more complex models.
Slides: A glance at information-geometric signal processingFrank Nielsen
This document discusses information geometry and its applications in statistical signal processing. It introduces several key concepts:
1) Statistical signal processing models data with probability distributions like Gaussians and histograms. Information geometry provides a geometric framework for intuitive reasoning about these statistical models.
2) Exponential family mixture models generalize Gaussian and Rayleigh mixtures and are algorithmically useful in dually flat spaces.
3) Distances between statistical models, like Kullback-Leibler divergence and Bregman divergences, can be interpreted geometrically in terms of convex conjugates and Legendre transformations.
1) The document discusses various methods for interpreting machine learning models, including global and local surrogate models, feature importance plots, Shapley values, partial dependence plots, and individual conditional expectation plots.
2) It explains that interpretability refers to how understandable the reasons for a model's predictions are to humans. Interpretability methods can provide global explanations of entire models or local explanations of individual predictions.
3) The document advocates that improving interpretability is important for addressing issues like bias in machine learning systems and increasing trust in applications used for high-stakes decisions like criminal justice.
A Study on Youth Violence and Aggression using DEMATEL with FCM Methodsijdmtaiir
The DEMATEL method is then a good technique for
making decisions. In this paper we analyzed the risk factors of
youth violence and what makes them more aggressive. Since
there are more risk factors of youth violence, to relate each
other more complex to construct FCM and analyze them.
Moreover the data is an unsupervised one obtained from
survey as well as interviews. Hence fuzzy alone has the
capacity to analyses these concepts.
Pattern learning and recognition on statistical manifolds: An information-geo...Frank Nielsen
This document provides an overview of Frank Nielsen's talk on pattern learning and recognition using information geometry and statistical manifolds. The talk focuses on departing from vector space representations and dealing with (dis)similarities that do not have Euclidean or metric properties. This poses new theoretical and computational challenges for pattern recognition. The talk describes using exponential family mixture models defined on dually flat statistical manifolds induced by convex functions. On these manifolds, dual coordinate systems and dual affine geodesics allow for computing-friendly representations of divergences and similarities between probabilistic patterns. The techniques aim to achieve statistical invariance and enable algorithmic approaches to problems like Gaussian mixture modeling, shape retrieval, and diffusion tensor imaging analysis.
This document discusses generative adversarial networks (GANs) and their relationship to reinforcement learning. It begins with an introduction to GANs, explaining how they can generate images without explicitly defining a probability distribution by using an adversarial training process. The second half discusses how GANs are related to actor-critic models and inverse reinforcement learning in reinforcement learning. It explains how GANs can be viewed as training a generator to fool a discriminator, similar to how policies are trained in reinforcement learning.
Cluster analysis is an unsupervised machine learning technique that groups similar data objects into clusters. It finds internal structures within unlabeled data by partitioning it into groups based on similarity. Some key applications of cluster analysis include market segmentation, document classification, and identifying subtypes of diseases. The quality of clusters depends on both the similarity measure used and how well objects are grouped within each cluster versus across clusters.
This document discusses various techniques for analyzing and visualizing data to gain insights. It covers data attribute types, basic statistical descriptions to understand data distribution and outliers, different visualization methods to discover patterns and relationships, and various ways to measure similarity between data objects, including distances, coefficients, and cosine similarity for text. The goal is to preprocess and understand data at a high level before applying more advanced analytics.
We will describe and analyze accurate and efficient numerical algorithms to interpolate and approximate the integral of multivariate functions. The algorithms can be applied when we are given the function values at an arbitrary positioned, and usually small, existing sparse set of function values (samples), and additional samples are impossible, or difficult (e.g. expensive) to obtain. The methods are based on local, and global, tensor-product sparse quasi-interpolation methods that are exact for a class of sparse multivariate orthogonal polynomials.
This document presents a survey of contemporary research on image segmentation through clustering techniques. It discusses various clustering approaches including exclusive clustering (e.g. k-means), overlapping clustering (e.g. fuzzy c-means), hierarchical clustering, and probabilistic D-clustering. It provides details on the algorithms and steps involved in each technique. The paper analyzes different clustering methods for image segmentation and concludes that fuzzy c-means is superior but has high computational costs, while probabilistic D-clustering can avoid this issue.
This document provides a summary of different image segmentation techniques through clustering. It discusses exclusive clustering methods like k-means clustering, overlapping clustering methods like fuzzy c-means, and hierarchical clustering. The paper reviews these clustering approaches and their application to image segmentation, which is the process of partitioning a digital image into multiple segments. Image segmentation through clustering has various uses including computer vision, medical imaging, and remote sensing.
Awarded presentation of my research activity, PhD Day 2011, February 23th 2011, Cagliari, Italy.
This presentation has been awarded as the best one of the track on information engineering.
Want to know more?
see my publications at
http://prag.diee.unica.it/pra/ita/people/satta
Dimensionality reduction by matrix factorization using concept lattice in dat...eSAT Journals
Abstract Concept lattices is the important technique that has become a standard in data analytics and knowledge presentation in many fields such as statistics, artificial intelligence, pattern recognition ,machine learning ,information theory ,social networks, information retrieval system and software engineering. Formal concepts are adopted as the primitive notion. A concept is jointly defined as a pair consisting of the intension and the extension. FCA can handle with huge amount of data it generates concepts and rules and data visualization. Matrix factorization methods have recently received greater exposure, mainly as an unsupervised learning method for latent variable decomposition. In this paper a novel method is proposed to decompose such concepts by using Boolean Matrix Factorization for dimensionality reduction. This paper focuses on finding all the concepts and the object intersections. Keywords: Data mining, formal concepts, lattice, matrix factorization dimensionality reduction.
Similaire à Paper Summary of Disentangling by Factorising (Factor-VAE) (20)
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Walmart Business+ and Spark Good for Nonprofits.pdfTechSoup
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
Gender and Mental Health - Counselling and Family Therapy Applications and In...PsychoTech Services
A proprietary approach developed by bringing together the best of learning theories from Psychology, design principles from the world of visualization, and pedagogical methods from over a decade of training experience, that enables you to: Learn better, faster!
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
Healing can occur in two ways: Regeneration and Repair
There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) CurriculumMJDuyan
(𝐓𝐋𝐄 𝟏𝟎𝟎) (𝐋𝐞𝐬𝐬𝐨𝐧 𝟏)-𝐏𝐫𝐞𝐥𝐢𝐦𝐬
𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
- Understand the goals and objectives of the Edukasyong Pantahanan at Pangkabuhayan (EPP) curriculum, recognizing its importance in fostering practical life skills and values among students. Students will also be able to identify the key components and subjects covered, such as agriculture, home economics, industrial arts, and information and communication technology.
𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
-Define entrepreneurship, distinguishing it from general business activities by emphasizing its focus on innovation, risk-taking, and value creation. Students will describe the characteristics and traits of successful entrepreneurs, including their roles and responsibilities, and discuss the broader economic and social impacts of entrepreneurial activities on both local and global scales.
Philippine Edukasyong Pantahanan at Pangkabuhayan (EPP) Curriculum
Paper Summary of Disentangling by Factorising (Factor-VAE)
1. Paper Summary :
Disentangling by Factorising
Jun-sik Choi
Department of Brain and Cognitive Engineering,
Korea University
November 26, 2019
2. Overview of paper [2]
To enhancing the disentangled representation, Factor-VAE is
proposed.
Factor-VAE enhances disentanglement by encouraging the
distribution of representations to be factorial (independent
accross the dimensions).
Factor-VAE provides a better trade-off between
disentanglement and reconstruction quality than β-VAE [1].
Also, a new disentnaglement metirc is proposed.
3. Unsupervised Disentangled Representation
Disentangled Representation
a representation where a change in one dimension corresponds
to a change in one factor of variation, while being relatively
invariant to changes in other factors. [3]
Why disentangled representation matters?[4]
Data can be represented in more interpretable and semantic
manner.
Learned disentangled representations are more transferrable.
Why disentangled representation in unsupervised manner
1. Humans are able to learn factors of variation unsupervised.
2. Labels are costly as obtaining them requires a human in the
loop.
3. Labels assigned by humans might be inconsistent or leave out
the factors that are difficult for humans to identify.
4. Factor-VAE
Goal
Obtain a better trade-off between disentnaglement and
reconstruction, which is one drawback of β-VAE [1].
How?
Factor-VAE augments the VAE objective with a penalty that
encourages the marginal distribution of representations to be
factorial without substantially affecting the quality of
reconstructions.
The penalty is expressed as a KL divergence between the
marginal distribution and the product of its marginals,
optimized by a discriminator network following the divergence
minimisation view of GANs.
5. Trade-off between Disentanglement and Reconstruction in
beta-VAE I
Notations and assumptions
- Observations: x(i)
∈ X, i = 1, . . . , N
- Underlying generative factors: f = (f1, . . . , fK )
- Latent code that models f : z ∈ Rd
- p(z) = N(0, I), decoder: pθ(x|z), encoder: qθ(z|x)
Disentanglement of Representation
- Variational posterior for an observation:
qθ(z|x) =
d
j=1
N zj |µj (x), σ2
j (x)
can be seen as the distribution of representation corresponding
to the data point x.
6. Trade-off between Disentanglement and Reconstruction in
beta-VAE II
- Marginal posterior and disentanglement
q(z) = Epdata (x)[q(z|x)] =
1
N
N
i=1
q z|x(i)
A disentangled represent would have each zj correspond to
precisely one underlying factor fk , so we want q(z) be
independently factorized:
q(z) =
d
j=1
q (zj )
7. Trade-off between Disentanglement and Reconstruction in
beta-VAE III
Further Decomposition of β-VAE objective
- The β-VAE objective:
1
N
N
i=1
Eq(z|x(i)
) log p x(i)
|z − βKL q z|x(i)
p(z)
is a lower bound of Epdata (x) log p x(i)
Where,
Eq(z|x(i)
) log p x(i)
|z : negative reconstruction error
KL q z|x(i)
p(z) : complexity penalty.
8. Trade-off between Disentanglement and Reconstruction in
beta-VAE IV
- The KL term can be further decomposed as:
Epdata(x)[KL(q(z|x) p(z))] = I(x; z) + KL(q(z) p(z))
proof
Epdata(x)[KL(q(z|x) p(z))]
= Epdata(x)Eq(z|x) log q(z|x)
p(z)
= Epdata(x)Eq(z|x) log q(z|x)
q(z)
q(z)
p(z)
= Epdata(x)Eq(z|x) log q(z|x)
q(z) + log q(z)
p(z)
= Epdata(x)[KL(q(z|x) q(z))] + Eq(x,z) log q(z)
p(z)
= Iq(x; z) + Eq(z) log q(z)
p(z)
= Iq(x; z) + KL(q(z) p(z))
9. Trade-off between Disentanglement and Reconstruction in
beta-VAE V
Epdata(x)[KL(q(z|x) p(z))] = I(x; z) + KL(q(z) p(z))
- When increasing penalty for complexity by setting β > 1,
KL(q(z) p(z)) and I(x; z) are both penalized.
- Penalizing KL(q(z) p(z)) makes q(z) to be factorized as prior
p(z).
- Penalizing I(x; z) reduces amount of information about x
stored in z, which lead to poor reconstruction.
10. Total Correlation Penalty I
Factor-VAE objective
1
N
N
i=1
Eq(z|x(i)
) log p x(i)
|z −KL q z|x(i)
p(z)
− γKL(q(z) ¯q(z))
where, ¯q(z) := d
j=1 q (zj ) is a lower bound on the marginal
log likelihood Epdata(x)[log p(x)] and directly encourages
independence in the code distribution.
Total correlation [5] KL(q(z) ¯q(z))
A popular measure of dependence for multiple random
variables.
As both q(z)and ¯q(z) are intractable, an alternative approach
for optimizing total correlation is required.
Total Correlation
11. Total Correlation Penalty II
Alternative way to optimize total correlation
1. Sample q z|x(i)
with uniformly sampled x(i)
.
2. Generate d samples from q(z) and ignoring all but one
dimension for each sample.
Or,
1. Sample a batch from q(z)
2. Randomly permuting across the batch for eatch latent
dimension.
As long as the batch is large enough, the distribution of these
samples will closely approximate ¯q(z).
12. Total Correlation Penalty III
Minimization of KL divergence
By training a classifier (Discriminator), approximate the density
ratio that arises in the KL term (Density-ratio trick [6]).
TC(z) = KL(q(z) ¯q(z)) = Eq(z) log
q(z)
¯q(z)
≈ Eq(z) log
D(z)
1 − D(z)
The discriminator and VAE trained jointly.
The discriminator is trained to classify between samples from
q(z) and ¯q(z).
15. Metric for Disentanglement I
Disentanglement metric proposed in [1]
Weaknesses
1. The metric is sensitive to hyperparameters of the linear
classifier optimization.
2. Learned representations can be a linear combination of several
dimensions, so using linear classifier is inppropiate.
3. The metric has a failure mode. When only K − 1 factors out
of K factors are disentangled, the classifier still gives 100%
accuracy.
16. Metric for Disentanglement II
Proposed metric for disentanglement
1. Choose a factor k and generate data with this factor fixed, but
all other factors varying randomly.
2. Obtain their representations.
3. Normalize each dimension by its empirical standard deviation s
over the full data (or a large enough random subset).
4. Take the empirical variance Var z
(l)
d /sd in each dimension of
normalized representations.
5. The target index k and index of dimension with the lowest
variance are fed to the majority-vote classifier.
If the representation is perfectly disentangled, the variance of
dimension corresponding to the fixed factor will be 0.
17. Metric for Disentanglement III
As representations are normalized, the argmin Varl z
(l)
d /sd is
invariant to rescaling of the representations in each dimension.
Majority-vote classification1
1. For each L samples, one vote (ai , bi ),
ai ∈ {1, . . . , D} , bi ∈ {1, . . . , K} is achieved.
2. Given M votes (ai , bi )M
i=1, Voting matrix
Vjk =
M
i=1 I (ai = j, bi = k) is achieved.
3. Then, the majority vote classifier is defined to be
C(j) = arg maxk Vjk .
4. In other words, C(j) is the index of generative factor k which
produces largest number of lowest variance for latent
dimension j.
5. The metric is the accuracy of the classifier
ΣD
j=1VjC(j)
Σj Σk Vjk
.
Note that for majority-vote classifier, there are no optimisation
hyperparameters to tune, and the resulting classifier is a
deterministic function of the training data.
18. Metric for Disentanglement IV
Comparison between metrics ([1, 2])
1. New disentanglement metric of [2] is much less sensitive to
hyperparameters than old metric of [1].
2. Old metric is very sensitive to number of iterations, and metric
is constantly improves with more iterations.
1
Please refer the code [Link] for more details.
19. Experiments I
Datasets
Dataset with known generative factors
1. 2D Shapes dataset[7] with n : 737,280, dim : 64 × 64
fk : shape(3), scale(6), orientation(40), x-position(32),
y-position(32)
2. 3D Shales dataset[8] with n : 480,000, dim : 64 × 64 × 3
fk : shape(4), scale(8), orientation(15), floor color(10), wall
color(10), object color(10)
Dataset with unknown generative factors
1. 3D Faces dataset[9] with n : 239,840, dim : 64 × 64 × 3
2. 3D Chairs dataset[10] with n : 86,366, dim : 64 × 64 × 3
3. CelebA dataset (Cropped)[11] with n : 202,599,
dim : 64 × 64 × 3
27. Conclusion
This work introduces FactorVAE, a novel method for
disentangled representation.
A new disentanglement metric is prorposed.
Limitations
Low total correlation is necessary but not sufficient for
disentangling of independent factors of variation. (When all
but one of the latent dimension were to collapse to prior,
TC=0 but not disentangled.)
The proposed metric requires to generate samples holding one
factor fixed, which is not always possible. (When training set
does not cover all possible factors)
The metric is also unsuitable for data with non-independent
factors of variation.
28. References
I. Higgins, L. Matthey, A. Pal, C. Burgess, X. Glorot,
M. Botvinick, S. Mohamed, and A. Lerchner, “beta-vae:
Learning basic visual concepts with a constrained variational
framework.,” ICLR, vol. 2, no. 5, p. 6, 2017.
H. Kim and A. Mnih, “Disentangling by factorising,” arXiv
preprint arXiv:1802.05983, 2018.
Y. Bengio, A. Courville, and P. Vincent, “Representation
learning: A review and new perspectives,” IEEE transactions on
pattern analysis and machine intelligence, vol. 35, no. 8,
pp. 1798–1828, 2013.
B. M. Lake, T. D. Ullman, J. B. Tenenbaum, and S. J.
Gershman, “Building machines that learn and think like
people,” Behavioral and Brain Sciences, vol. 40, no. 2017,
2017.
S. Watanabe, “Information theoretical analysis of multivariate
correlation,” IBM Journal of research and development, vol. 4,
29. Total Correlation
Definition
For a given n random variables {X1, X2, . . . , Xn},
Total correlation is defined as the KL divergence from the joint
distribution p(X1, . . . , Xn) to the independent distribution of
p(X1)p(X2) · · · p(Xn).
TC (X1, X2, . . . , Xn) ≡ DKL [p (X1, . . . , Xn) p (X1) p (X2) · · · p (Xn)]
TC (X1, X2, . . . , Xn) =
n
i=1
H (Xi ) − H (X1, X2, . . . , Xn)
= The amount of information shared
among the variables in the set.
A near-zero TC indicates that the variables in the group are
essentially statistically independent.
Back