Paper Summary of Disentangling by Factorising (Factor-VAE)준식 최
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.
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.
Mask R-CNN extends Faster R-CNN by adding a branch for predicting segmentation masks in parallel with bounding box recognition and classification. It introduces a new layer called RoIAlign to address misalignment issues in the RoIPool layer of Faster R-CNN. RoIAlign improves mask accuracy by 10-50% by removing quantization and properly aligning extracted features. Mask R-CNN runs at 5fps with only a small overhead compared to Faster R-CNN.
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.
This document contains questions related to a digital image processing assignment. It includes 30 short questions and 25 long questions covering various topics in digital image processing such as image formation, resolution, sampling, filtering, color models, transformations, compression, and applications. The questions assess concepts such as image classification, components of an image processing workstation, steps in an image processing application, storage requirements, and transmission times for images. Filtering techniques like spatial filtering and morphological operations are also covered.
Image Classification And Support Vector MachineShao-Chuan Wang
This document discusses support vector machines and their application to image classification. It provides an overview of SVM concepts like functional and geometric margins, optimization to maximize margins, Lagrangian duality, kernels, soft margins, and bias-variance tradeoff. It also covers multiclass SVM approaches, dimensionality reduction techniques, model selection via cross-validation, and results from applying SVM to an image classification problem.
Lecture 3 image sampling and quantizationVARUN KUMAR
This document discusses image sampling and quantization. It begins by covering 2D sampling of images, including the spectrum of sampled images and the Nyquist criteria for proper reconstruction. It then covers quantization, describing how continuous variables are mapped to discrete levels. The document focuses on Lloyd-Max quantization, which minimizes mean square error for a given number of quantization levels. It provides equations for calculating optimal decision levels and reconstruction levels to design an optimum quantizer based on the probability density function of the signal. Common probability densities used for image data, such as Gaussian, Laplacian, and uniform, are also covered.
Paper Summary of Disentangling by Factorising (Factor-VAE)준식 최
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.
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.
Mask R-CNN extends Faster R-CNN by adding a branch for predicting segmentation masks in parallel with bounding box recognition and classification. It introduces a new layer called RoIAlign to address misalignment issues in the RoIPool layer of Faster R-CNN. RoIAlign improves mask accuracy by 10-50% by removing quantization and properly aligning extracted features. Mask R-CNN runs at 5fps with only a small overhead compared to Faster R-CNN.
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.
This document contains questions related to a digital image processing assignment. It includes 30 short questions and 25 long questions covering various topics in digital image processing such as image formation, resolution, sampling, filtering, color models, transformations, compression, and applications. The questions assess concepts such as image classification, components of an image processing workstation, steps in an image processing application, storage requirements, and transmission times for images. Filtering techniques like spatial filtering and morphological operations are also covered.
Image Classification And Support Vector MachineShao-Chuan Wang
This document discusses support vector machines and their application to image classification. It provides an overview of SVM concepts like functional and geometric margins, optimization to maximize margins, Lagrangian duality, kernels, soft margins, and bias-variance tradeoff. It also covers multiclass SVM approaches, dimensionality reduction techniques, model selection via cross-validation, and results from applying SVM to an image classification problem.
Lecture 3 image sampling and quantizationVARUN KUMAR
This document discusses image sampling and quantization. It begins by covering 2D sampling of images, including the spectrum of sampled images and the Nyquist criteria for proper reconstruction. It then covers quantization, describing how continuous variables are mapped to discrete levels. The document focuses on Lloyd-Max quantization, which minimizes mean square error for a given number of quantization levels. It provides equations for calculating optimal decision levels and reconstruction levels to design an optimum quantizer based on the probability density function of the signal. Common probability densities used for image data, such as Gaussian, Laplacian, and uniform, are also covered.
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.
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.
1) The document discusses spatial filtering of digital images, which refers to modifying images by applying filters in the spatial domain rather than the frequency domain.
2) Spatial filters are applied by using a kernel or mask over an image to perform operations on pixels within the mask's area. Common operations include averaging, edge detection, and noise removal.
3) A 3x3 mask is demonstrated as the simplest case, where the response value for the center pixel is the sum of the pixel values multiplied by the corresponding mask weights. This allows various filters to be generated for different purposes.
The document discusses the Vision Transformer (ViT) model for computer vision tasks. It covers:
1. How ViT tokenizes images into patches and uses position embeddings to encode spatial relationships.
2. ViT uses a class embedding to trigger class predictions, unlike CNNs which have decoders.
3. The receptive field of ViT grows as the attention mechanism allows elements to attend to other distant elements in later layers.
4. Initial results showed ViT performance was comparable to CNNs when trained on large datasets but lagged CNNs trained on smaller datasets like ImageNet.
Spatial filtering using image processingAnuj Arora
(1) Spatial filtering is defined as operations performed on pixels within a neighborhood of an image using a mask or kernel. (2) Filters can be used to blur/smooth an image by reducing noise or sharpen an image by enhancing edges. (3) Common linear filtering methods include averaging, Gaussian, and derivative filters which are implemented using various mask patterns to modify pixels in the filtered image.
This document discusses the Fourier transformation, including:
1) It defines continuous and discrete Fourier transformations and their properties such as separability, translation, periodicity, and convolution.
2) The fast Fourier transformation (FFT) improves the computational complexity of the discrete Fourier transformation from O(N^2) to O(NlogN).
3) FFT works by rewriting the DFT calculation in a way that exploits symmetry and reduces redundant computations.
This document summarizes spatial filtering techniques for image enhancement, including smoothing and sharpening filters. It discusses neighbourhood operations and different types of spatial filters like averaging filters and median filters that can be used to smooth images. Techniques for sharpening images like the Laplacian filter and highboost filter are also covered. The document provides examples and equations to demonstrate how various spatial filters work to enhance images.
Detecting malaria using a deep convolutional neural networkYusuf Brima
Experiment with Deep Residual Convolutional Neural Network to classify microscopic blood cell images (Uninfected, Parasitized)
Utiling ResNet,Deep Residual Learning for Image Recognition (He et al, 2015) architecture.
Uses Keras with a Tensorflow backend.
The document discusses various image enhancement techniques in digital image processing. It describes point operations like image negative, contrast stretching, thresholding, brightness enhancement, log transformation, and power law transformation. Contrast stretching expands the range of intensity levels and can be done by multiplying pixels with a constant, using a transfer function, or histogram equalization. Thresholding converts an image to binary by assigning pixel values above a threshold to one level and below to another. Log and power law transformations compress high intensity values and expand low values to enhance an image. Matlab code examples are provided for each technique.
The document summarizes the U-Net convolutional network architecture for biomedical image segmentation. U-Net improves on Fully Convolutional Networks (FCNs) by introducing a U-shaped architecture with skip connections between contracting and expansive paths. This allows contextual information from the contracting path to be combined with localization information from the expansive path, improving segmentation of biomedical images which often have objects at multiple scales. The U-Net architecture has been shown to perform well even with limited training data due to its ability to make use of context.
Photo-realistic Single Image Super-resolution using a Generative Adversarial ...Hansol Kang
* Ledig, Christian, et al. "Photo-realistic single image super-resolution using a generative adversarial network." Proceedings of the IEEE conference on computer vision and pattern recognition. 2017.
【DL輪読会】Standardized Max Logits: A Simple yet Effective Approach for Identifyi...Deep Learning JP
1) The document proposes a simple method called Standardized Max Logits (SML) to detect unexpected road obstacles in semantic segmentation. SML normalizes the maximum logit values for each class to account for differences between in-distribution classes and better identify anomalies.
2) SML is combined with iterative boundary suppression and dilated smoothing techniques to gradually remove false positives and negatives, especially around boundaries.
3) Experiments on three datasets demonstrate SML achieves state-of-the-art performance in detecting anomalies without requiring retraining or additional out-of-distribution data, while maintaining efficient computation.
HIGH PASS FILTER IN DIGITAL IMAGE PROCESSINGBimal2354
The document discusses digital image processing and various filtering techniques. It describes pre-processing, enhancement, reduction, magnification, and transformation techniques. It focuses on spatial filtering methods including statistical, crisp, and convolution filtering. Convolution filtering includes low-pass and high-pass filters such as ideal, Butterworth, and Gaussian high-pass filters. High-pass filters emphasize fine details and opposite of low-pass filters. The conclusion states that high-pass filters have applications but not for all studies, so other image filtering techniques need to be explored.
A summary of Categorical Reparameterization with Gumbel-Softmax by Jang et al...Jin-Hwa Kim
This document proposes the Gumbel-Softmax distribution as a way to differentially sample from a categorical distribution. It describes how categorical variables are non-differentiable to train with backpropagation. The REINFORCE algorithm uses the likelihood ratio to estimate gradients but has high variance. Gumbel-Softmax approximates the categorical with a continuous relaxation using the Gumbel-Max trick, allowing gradients to flow. It shows this continuous relaxation performs similarly to the discrete categorical distribution but is differentiable, enabling lower-variance training of models with categorical latent variables.
Sree Narayan Chakraborty presented on the Canny edge detection algorithm. The algorithm aims to detect edges with high signal-to-noise ratio while minimizing false detections. It involves smoothing the image, finding gradients, non-maximum suppression to detect local maxima, and hysteresis thresholding to determine real edges. The performance of Canny edge detection depends on adjustable parameters like the Gaussian filter's standard deviation and threshold values, which can be tailored for different environments.
Mask R-CNN is an algorithm for instance segmentation that builds upon Faster R-CNN by adding a branch for predicting masks in parallel with bounding boxes. It uses a Feature Pyramid Network to extract features at multiple scales, and RoIAlign instead of RoIPool for better alignment between masks and their corresponding regions. The architecture consists of a Region Proposal Network for generating candidate object boxes, followed by two branches - one for classification and box regression, and another for predicting masks with a fully convolutional network using per-pixel sigmoid activations and binary cross-entropy loss. Mask R-CNN achieves state-of-the-art performance on standard instance segmentation benchmarks.
image classification is a common problem in Artificial Intelligence , we used CIFR10 data set and tried a lot of methods to reach a high test accuracy like neural networks and Transfer learning techniques .
you can view the source code and the papers we read on github : https://github.com/Asma-Hawari/Machine-Learning-Project-
Manifold learning with application to object recognitionzukun
This document discusses manifold learning techniques for dimensionality reduction that can uncover the intrinsic structure of high-dimensional data. It introduces Isomap and Locally Linear Embedding (LLE) as two popular manifold learning algorithms. Isomap uses graph-based distances to preserve global structure, while LLE aims to preserve local linear relationships between neighbors. Both techniques find low-dimensional embeddings that best represent the high-dimensional data. Manifold learning provides data compression and enables techniques like object recognition by discovering the underlying manifold structure.
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.
This document summarizes a presentation about variational autoencoders (VAEs) presented at the ICLR 2016 conference. The document discusses 5 VAE-related papers presented at ICLR 2016, including Importance Weighted Autoencoders, The Variational Fair Autoencoder, Generating Images from Captions with Attention, Variational Gaussian Process, and Variationally Auto-Encoded Deep Gaussian Processes. It also provides background on variational inference and VAEs, explaining how VAEs use neural networks to model probability distributions and maximize a lower bound on the log likelihood.
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.
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.
1) The document discusses spatial filtering of digital images, which refers to modifying images by applying filters in the spatial domain rather than the frequency domain.
2) Spatial filters are applied by using a kernel or mask over an image to perform operations on pixels within the mask's area. Common operations include averaging, edge detection, and noise removal.
3) A 3x3 mask is demonstrated as the simplest case, where the response value for the center pixel is the sum of the pixel values multiplied by the corresponding mask weights. This allows various filters to be generated for different purposes.
The document discusses the Vision Transformer (ViT) model for computer vision tasks. It covers:
1. How ViT tokenizes images into patches and uses position embeddings to encode spatial relationships.
2. ViT uses a class embedding to trigger class predictions, unlike CNNs which have decoders.
3. The receptive field of ViT grows as the attention mechanism allows elements to attend to other distant elements in later layers.
4. Initial results showed ViT performance was comparable to CNNs when trained on large datasets but lagged CNNs trained on smaller datasets like ImageNet.
Spatial filtering using image processingAnuj Arora
(1) Spatial filtering is defined as operations performed on pixels within a neighborhood of an image using a mask or kernel. (2) Filters can be used to blur/smooth an image by reducing noise or sharpen an image by enhancing edges. (3) Common linear filtering methods include averaging, Gaussian, and derivative filters which are implemented using various mask patterns to modify pixels in the filtered image.
This document discusses the Fourier transformation, including:
1) It defines continuous and discrete Fourier transformations and their properties such as separability, translation, periodicity, and convolution.
2) The fast Fourier transformation (FFT) improves the computational complexity of the discrete Fourier transformation from O(N^2) to O(NlogN).
3) FFT works by rewriting the DFT calculation in a way that exploits symmetry and reduces redundant computations.
This document summarizes spatial filtering techniques for image enhancement, including smoothing and sharpening filters. It discusses neighbourhood operations and different types of spatial filters like averaging filters and median filters that can be used to smooth images. Techniques for sharpening images like the Laplacian filter and highboost filter are also covered. The document provides examples and equations to demonstrate how various spatial filters work to enhance images.
Detecting malaria using a deep convolutional neural networkYusuf Brima
Experiment with Deep Residual Convolutional Neural Network to classify microscopic blood cell images (Uninfected, Parasitized)
Utiling ResNet,Deep Residual Learning for Image Recognition (He et al, 2015) architecture.
Uses Keras with a Tensorflow backend.
The document discusses various image enhancement techniques in digital image processing. It describes point operations like image negative, contrast stretching, thresholding, brightness enhancement, log transformation, and power law transformation. Contrast stretching expands the range of intensity levels and can be done by multiplying pixels with a constant, using a transfer function, or histogram equalization. Thresholding converts an image to binary by assigning pixel values above a threshold to one level and below to another. Log and power law transformations compress high intensity values and expand low values to enhance an image. Matlab code examples are provided for each technique.
The document summarizes the U-Net convolutional network architecture for biomedical image segmentation. U-Net improves on Fully Convolutional Networks (FCNs) by introducing a U-shaped architecture with skip connections between contracting and expansive paths. This allows contextual information from the contracting path to be combined with localization information from the expansive path, improving segmentation of biomedical images which often have objects at multiple scales. The U-Net architecture has been shown to perform well even with limited training data due to its ability to make use of context.
Photo-realistic Single Image Super-resolution using a Generative Adversarial ...Hansol Kang
* Ledig, Christian, et al. "Photo-realistic single image super-resolution using a generative adversarial network." Proceedings of the IEEE conference on computer vision and pattern recognition. 2017.
【DL輪読会】Standardized Max Logits: A Simple yet Effective Approach for Identifyi...Deep Learning JP
1) The document proposes a simple method called Standardized Max Logits (SML) to detect unexpected road obstacles in semantic segmentation. SML normalizes the maximum logit values for each class to account for differences between in-distribution classes and better identify anomalies.
2) SML is combined with iterative boundary suppression and dilated smoothing techniques to gradually remove false positives and negatives, especially around boundaries.
3) Experiments on three datasets demonstrate SML achieves state-of-the-art performance in detecting anomalies without requiring retraining or additional out-of-distribution data, while maintaining efficient computation.
HIGH PASS FILTER IN DIGITAL IMAGE PROCESSINGBimal2354
The document discusses digital image processing and various filtering techniques. It describes pre-processing, enhancement, reduction, magnification, and transformation techniques. It focuses on spatial filtering methods including statistical, crisp, and convolution filtering. Convolution filtering includes low-pass and high-pass filters such as ideal, Butterworth, and Gaussian high-pass filters. High-pass filters emphasize fine details and opposite of low-pass filters. The conclusion states that high-pass filters have applications but not for all studies, so other image filtering techniques need to be explored.
A summary of Categorical Reparameterization with Gumbel-Softmax by Jang et al...Jin-Hwa Kim
This document proposes the Gumbel-Softmax distribution as a way to differentially sample from a categorical distribution. It describes how categorical variables are non-differentiable to train with backpropagation. The REINFORCE algorithm uses the likelihood ratio to estimate gradients but has high variance. Gumbel-Softmax approximates the categorical with a continuous relaxation using the Gumbel-Max trick, allowing gradients to flow. It shows this continuous relaxation performs similarly to the discrete categorical distribution but is differentiable, enabling lower-variance training of models with categorical latent variables.
Sree Narayan Chakraborty presented on the Canny edge detection algorithm. The algorithm aims to detect edges with high signal-to-noise ratio while minimizing false detections. It involves smoothing the image, finding gradients, non-maximum suppression to detect local maxima, and hysteresis thresholding to determine real edges. The performance of Canny edge detection depends on adjustable parameters like the Gaussian filter's standard deviation and threshold values, which can be tailored for different environments.
Mask R-CNN is an algorithm for instance segmentation that builds upon Faster R-CNN by adding a branch for predicting masks in parallel with bounding boxes. It uses a Feature Pyramid Network to extract features at multiple scales, and RoIAlign instead of RoIPool for better alignment between masks and their corresponding regions. The architecture consists of a Region Proposal Network for generating candidate object boxes, followed by two branches - one for classification and box regression, and another for predicting masks with a fully convolutional network using per-pixel sigmoid activations and binary cross-entropy loss. Mask R-CNN achieves state-of-the-art performance on standard instance segmentation benchmarks.
image classification is a common problem in Artificial Intelligence , we used CIFR10 data set and tried a lot of methods to reach a high test accuracy like neural networks and Transfer learning techniques .
you can view the source code and the papers we read on github : https://github.com/Asma-Hawari/Machine-Learning-Project-
Manifold learning with application to object recognitionzukun
This document discusses manifold learning techniques for dimensionality reduction that can uncover the intrinsic structure of high-dimensional data. It introduces Isomap and Locally Linear Embedding (LLE) as two popular manifold learning algorithms. Isomap uses graph-based distances to preserve global structure, while LLE aims to preserve local linear relationships between neighbors. Both techniques find low-dimensional embeddings that best represent the high-dimensional data. Manifold learning provides data compression and enables techniques like object recognition by discovering the underlying manifold structure.
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.
This document summarizes a presentation about variational autoencoders (VAEs) presented at the ICLR 2016 conference. The document discusses 5 VAE-related papers presented at ICLR 2016, including Importance Weighted Autoencoders, The Variational Fair Autoencoder, Generating Images from Captions with Attention, Variational Gaussian Process, and Variationally Auto-Encoded Deep Gaussian Processes. It also provides background on variational inference and VAEs, explaining how VAEs use neural networks to model probability distributions and maximize a lower bound on the log likelihood.
Topic of presentation: Variational autoencoders for speech processing
The main points of the presentation: Variational autoencoders (or VAE) have become one of the most popular unsupervised learning techniques for modelling complex data distributions, such as images and audio. In this talk I'll begin with a general introduction to VAEs and then review a recent technique called VQ-VAE which is capable of learning rundimentary phoneme-level language model from raw audio without any supervision.
http://dataconf.com.ua/speaker-page/dmytro-bielievtsov.php
https://www.youtube.com/watch?v=euYSAL-aKMI&list=PL5_LBM8-5sLjbRFUtXaUpg84gtJtyc4Pu&t=0s&index=9
Regularization is used in deep learning to reduce generalization error by modifying the learning algorithm. Common regularization techniques for deep neural networks include:
1) Parameter norm penalties like L2 and L1 regularization that penalize the weights of a network. This encourages simpler models that generalize better.
2) Early stopping which obtains the model parameters at the point of lowest validation error during training, rather than at the end of training.
3) Data augmentation which creates additional fake training data through techniques like translation to improve robustness.
The document discusses weighted secure domination in graphs. It begins by defining domination number and weighted domination number. It proposes a greedy algorithm that provides a 1 + log(n) approximation for weighted domination number. The algorithm works by iteratively selecting the unselected vertex with the minimum ratio of weight to number of uncovered neighbors. This achieves an approximation ratio of H(n), which is at most 1 + log(n). The algorithm runs in polynomial time.
Many biological systems exhibit heterogeneiety on a population level. This heterogeneity can be captured by describing the temporal evolution of the probability of an individual in the population to be in a certain state as partial differential equation. To tune parameters of such a partial differential equation to experimental data, a partial differential equation constrained optimisation problem has to be solved. Hence, for biological systems with a large number of states, a high-dimensional partial differential equation has to be solved. This can easily render the optimisation problem intractable, As there are no well-established, efficient integration schemes for high dimensional partial differential equations available. In this talk we will present techniques to translate the partial differential equation constrained optimization problem into a hierarchical, ordinary differential equation constrained optimization problem given a certain set of assumptions. We will present these assumptionas as well as the derivation of the hierarchical, ordinary differential equation constrained optimisation problem. Moreover we will present numerical schemes for the computation of the respective objective function and its gradient. Eventually we will also present numerical schemes to solve the constrained optimisation problem and apply these techniques to small and large scale biological applications for which experimental data is available.
This document provides an introduction to support vector machines (SVMs). It discusses how SVMs can be used for binary classification, regression, and multi-class problems. SVMs find the optimal separating hyperplane that maximizes the margin between classes. Soft margins allow for misclassified points by introducing slack variables. Kernels are discussed for mapping data into higher dimensional feature spaces to perform linear separation. The document outlines the formulation of SVMs for classification and regression and discusses model selection and different kernel functions.
Scalable Global Alignment Graph Kernel Using Random Features: From Node Embed...seijihagawa
This document proposes a new graph kernel method that approximates graph similarity using random graph embeddings. It aims to improve scalability over previous methods while still capturing global graph properties. The method first learns latent node embeddings for each graph, then defines the graph kernel as the similarity between random embeddings of the graphs, allowing for faster computation. Evaluation on 12 benchmark algorithms shows it outperforms state-of-the-art graph kernels and neural networks for graph classification tasks.
This document provides an overview of Bayesian decision theory. It begins by defining Bayesian decision theory as a statistical approach that quantifies the tradeoffs between decisions using probabilities and costs. It then discusses using Bayesian decision theory to classify fish by type based on observed features and probabilities. The document explains key Bayesian concepts like prior and posterior probabilities, conditional probabilities, discriminant functions, and how the Gaussian distribution relates to Bayesian classification. The overall summary is that Bayesian decision theory provides a framework for making optimal decisions under uncertainty by accounting for probabilities and costs associated with different outcomes.
In recent years, deep learning has had a profound impact on machine learning and artificial intelligence. At the same time, algorithms for quantum computers have been shown to efficiently solve some problems that are intractable on conventional, classical computers. We show that quantum computing not only reduces the time required to train a deep restricted Boltzmann machine, but also provides a richer and more comprehensive framework for deep learning than classical computing and leads to significant improvements in the optimization of the underlying objective function. Our quantum methods also permit efficient training of full Boltzmann machines and multilayer, fully connected models and do not have well known classical counterparts.
This document discusses approximate Bayesian computation (ABC) techniques for performing Bayesian inference when the likelihood function is not available in closed form. It covers the basic ABC algorithm and discusses challenges with high-dimensional data. It also summarizes recent advances in ABC that incorporate nonparametric regression, reproducing kernel Hilbert spaces, and neural networks to help address these challenges.
GraphClust is an alignment-free method for clustering RNA sequences based on their secondary structures. It represents RNA secondary structures as labeled graphs and uses a graph kernel called NSPDK to compute similarities between graphs. GraphClust clusters RNAs in a linear time complexity by using MinHash to identify candidate neighborhoods for clustering, then refines clusters with sequence-structure alignment tools. It was able to cluster hundreds of thousands of RNA sequences in under a month, while traditional alignment-based methods would take hundreds of computer years for the same task.
(DL hacks輪読) How to Train Deep Variational Autoencoders and Probabilistic Lad...Masahiro Suzuki
This document discusses techniques for training deep variational autoencoders and probabilistic ladder networks. It proposes three advances: 1) Using an inference model similar to ladder networks with multiple stochastic layers, 2) Adding a warm-up period to keep units active early in training, and 3) Using batch normalization. These advances allow training models with up to five stochastic layers and achieve state-of-the-art log-likelihood results on benchmark datasets. The document explains variational autoencoders, probabilistic ladder networks, and how the proposed techniques parameterize the generative and inference models.
MVPA with SpaceNet: sparse structured priorsElvis DOHMATOB
The GraphNet (aka S-Lasso), as well as other “sparsity + structure” priors like TV (Total-Variation), TV-L1, etc., are not easily applicable to brain data because of technical problems
relating to the selection of the regularization parameters. Also, in
their own right, such models lead to challenging high-dimensional optimization problems. In this manuscript, we present some heuristics for speeding up the overall optimization process: (a) Early-stopping, whereby one halts the optimization process when the test score (performance on leftout data) for the internal cross-validation for model-selection stops improving, and (b) univariate feature-screening, whereby irrelevant (non-predictive) voxels are detected and eliminated before the optimization problem is entered, thus reducing the size of the problem. Empirical results with GraphNet on real MRI (Magnetic Resonance Imaging) datasets indicate that these heuristics are a win-win strategy, as they add speed without sacrificing the quality of the predictions. We expect the proposed heuristics to work on other models like TV-L1, etc.
This document provides an overview of deep learning algorithms, including deep neural networks, convolutional neural networks, deep belief networks, and restricted Boltzmann machines. It discusses key concepts such as learning in deep neural networks, the evolution timeline of deep learning approaches, deep architectures, and restricted Boltzmann machines. It also covers training restricted Boltzmann machines using contrastive divergence, constructing deep belief networks by stacking restricted Boltzmann machines, and practical considerations for pre-training and fine-tuning deep belief networks.
On Convolution of Graph Signals and Deep Learning on Graph DomainsJean-Charles Vialatte
This document provides an outline and definitions for a thesis on convolution of graph signals and deep learning on graph domains. It discusses motivations, related work, definitions of graph signals and convolution, and different approaches to extending convolution operations to non-Euclidean graph domains. Specifically, it covers spectral approaches that define convolution in the graph spectral domain, vertex-domain approaches that define it as a sum over neighborhoods, and characterizes convolutional operators by their equivariance properties. It also discusses applications to deep learning on graphs and different notions of graph convolution.
The document discusses challenges in verifying programs that involve complex mathematical operations. It presents examples involving functions of complex variables, like transformations of flow equations, and challenges in automatically demonstrating properties like injectivity. The key challenges are the complexity of cylindrical algebraic decomposition used in verification, and formulating injectivity questions in a way that exploits properties of continuous functions. Overall, the document argues that fully automated verification of programs involving complex math is very difficult with current techniques, and more research is needed to address these challenges.
Similaire à Paper Summary of Beta-VAE: Learning Basic Visual Concepts with a Constrained Variational Framework (20)
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
Confiscations, Kotahitanga, Kingitanga, Parliament, Suffrage, Repudiation, Economic Change, Agriculture, Gold Mining, Timber, Flax, Sheep, Dairying,
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Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
BIOLOGY NATIONAL EXAMINATION COUNCIL (NECO) 2024 PRACTICAL MANUAL.pptx
Paper Summary of Beta-VAE: Learning Basic Visual Concepts with a Constrained Variational Framework
1. Paper Summary :
beta-VAE: Learning Basic Visual Concepts with a
Constrained Variational Framework
Jun-sik Choi
Department of Brain and Cognitive Engineering,
Korea University
November 9, 2019
2. Overview of beta-VAE [1]
β-VAE is an unsupervised for learning disentangled
representations of independent visual data generative factors.
β-VAE adds an extra hyperparameter β to the VAE objective,
which constricts the encoding capacity of the latent bottleneck
and encourages factorized latent representation.
A protocol that can quantitatively compare the degree of
disentanglement learnt by different models is proposed.
3. Derivation of beta-VAE framework I
Assumption
Let D = {X, V , W },
x ∈ RN
: images,
v ∈ RK
: conditionally independent factors,
w ∈ RH
: conditionally dependent factors
p(x|v, w) = Sim(v, w): true world simulator using ground truth
generative factors.
An unsupervised deep generative model pθ(x|z) can learn a joint
distribution between x and z ∈ RM
, (M ≥ K) by maximizing :
max
θ
Epθ(z) [pθ(x|z)] then p∗
θ (x|z) ≈ p(x|v, w) = Sim(v, w)
The aim is to ensure that the inference model qφ(z|x) capture the
independent generative factor v in a disentangled manner and keep
conditional generative factors remain entangled in a separate subset
of z.
4. Derivation of beta-VAE framework II
To encourage disentangling property of qφ(z|x),
1. the prior p(z) is set to an isotropic unit Gaussian N(0, I).
2. qφ(z|x) is constrained to match a prior p(z)
This constrained optimisation problem can be expressed as:
max
φ,θ
Ex∼D Eqφ(z|x) [log pθ(x|z)] subject to DKL (qφ(z|x) p(z)) <
After applying Lagrangian transformation under the KKT
conditions,
F(θ, φ, β; x, z) = Eqφ(z|x) [log pθ(x|z)] − β (DKL (qφ(z|x) p(z)) − )
≥ L(θ, φ; x, z, β)
= Eqφ(z|x) [log pθ(x|z)] − βDKL (qφ(z|x) p(z))
5. Derivation of beta-VAE framework III
Meaning of β
1. β changes the degree of applied learning pressure during
training, thus encouraging different learnt representations.
2. When β = 1, β-VAE corresponds to the original VAE
formulation.
3. Set β > 1 is putting a stronger constraint on the latent
bottleneck than in the original VAE formulation.
4. Pressure to match KL-divergence limit the capacity of z,
encourage the model to learn the most efficient representation
of the data (the disentangled representation by conditionally
independent factor v).
5. There is a trade-off between reconstruction fidelity and the
quality of disentanglement.
6. Disentanglement Metric I
The description of calculation of disentanglement in the paper
[1] is too complex, so I summarized it to a form of pseudocode.
Data: D = {V ∈ RK
, C ∈ RH
, X ∈ RN
}
lclf ; Linear classifier, q(z|x) ∼ N(µ(x), σ(x));
for b in Batch do
Sample yb
from Unif[1 · · · K];
for l in L do
Sample v1 from p(v) and Sample v2 from p(v);
[v2]yb ← [v1]yb ;
Sample c1 and c2 from p(c);
x1 ← Sim(v1, c1) and x2 ← Sim(v2, c2);
z1 ← µ(x1) and z2 ← µ(x2);
zl
diff ← |z1 − z2|;
end
zb
diff = 1
L ΣL
l zl
diff ;
Predb
= lclf (zb
diff );
end
Loss = ΣB
b CrossEntropy(Predb
, yb
);
Update lclf ;
7. Disentanglement Metric II
The linear classifier predict which generative factor [v]i is shared
along the pair of images.
As q(z|x) has disentangled representation, the performance of
classifier increases.
The linear classifier should be very simple and have a low
VC-dimension in order to ensure that it has no capacity to perform
nonlinear disentangling itself.
8. Qualitative Results - 3D chairs
Figure: Qualitative results comparing disentangling performance of
beta-VAE (beta = 5), and other comparing methods.
9. Qualitative Results - 3D faces
Figure: Qualitative results comparing disentangling performance of
beta-VAE (beta = 20), and other comparing methods.
10. Qualitative Results - CelebA
Figure: Traversal of individual latents demonstrates that beta-VAE
discovered.
11. Quantitative Results
Figure: (Left) Disentanglement metric classification accuracy for 2D
shapes dataset. (Right) Positive correlation between normalized beta and
size of latent variable for disentangled factor learning for a fixed
beta-VAE architecture.
13. 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.