Search Results for author: Ashkan Panahi

Found 19 papers, 3 papers with code

Precise Asymptotic Analysis of Deep Random Feature Models

no code implementations13 Feb 2023 David Bosch, Ashkan Panahi, Babak Hassibi

We provide exact asymptotic expressions for the performance of regression by an $L-$layer deep random feature (RF) model, where the input is mapped through multiple random embedding and non-linear activation functions.

FsaNet: Frequency Self-attention for Semantic Segmentation

1 code implementation28 Nov 2022 Fengyu Zhang, Ashkan Panahi, Guangjun Gao

By ablation study, we show that low frequency self-attention can achieve very close or better performance relative to full frequency even without retraining the network.

Instance Segmentation Semantic Segmentation

Fast OT for Latent Domain Adaptation

no code implementations2 Oct 2022 Siddharth Roheda, Ashkan Panahi, Hamid Krim

This is achieved by minimizing the cost of transporting the samples from the target domain to the distribution of the source domain.

Unsupervised Domain Adaptation

Sharing pattern submodels for prediction with missing values

no code implementations22 Jun 2022 Lena Stempfle, Ashkan Panahi, Fredrik D. Johansson

Conversely, fitting a single shared model to the full data set relies on imputation which often leads to biased results when missingness depends on unobserved factors.

Imputation

Random Features Model with General Convex Regularization: A Fine Grained Analysis with Precise Asymptotic Learning Curves

no code implementations6 Apr 2022 David Bosch, Ashkan Panahi, Ayca Özcelikkale, Devdatt Dubhash

We compute precise asymptotic expressions for the learning curves of least squares random feature (RF) models with either a separable strongly convex regularization or the $\ell_1$ regularization.

regression

Robust Group Subspace Recovery: A New Approach for Multi-Modality Data Fusion

no code implementations18 Jun 2020 Sally Ghanem, Ashkan Panahi, Hamid Krim, Ryan A. Kerekes

Robust Subspace Recovery (RoSuRe) algorithm was recently introduced as a principled and numerically efficient algorithm that unfolds underlying Unions of Subspaces (UoS) structure, present in the data.

Clustering Time Series +1

Analysis of Knowledge Transfer in Kernel Regime

no code implementations30 Mar 2020 Arman Rahbar, Ashkan Panahi, Chiranjib Bhattacharyya, Devdatt Dubhashi, Morteza Haghir Chehreghani

Knowledge transfer is shown to be a very successful technique for training neural classifiers: together with the ground truth data, it uses the "privileged information" (PI) obtained by a "teacher" network to train a "student" network.

Knowledge Distillation Transfer Learning

Community Detection and Improved Detectability in Multiplex Networks

no code implementations23 Sep 2019 Yuming Huang, Ashkan Panahi, Hamid Krim, Liyi Dai

We further demonstrate by numerical experiments that in the presence of consistent communities between different layers, consistent communities are matched, and the detectability is improved over a single layer.

Community Detection Stochastic Block Model

Deep Adversarial Belief Networks

no code implementations13 Sep 2019 Yuming Huang, Ashkan Panahi, Hamid Krim, Yiyi Yu, Spencer L. Smith

We present a novel adversarial framework for training deep belief networks (DBNs), which includes replacing the generator network in the methodology of generative adversarial networks (GANs) with a DBN and developing a highly parallelizable numerical algorithm for training the resulting architecture in a stochastic manner.

Sparse Generative Adversarial Network

no code implementations20 Aug 2019 Shahin Mahdizadehaghdam, Ashkan Panahi, Hamid Krim

To that end we start by dividing an image into multiple patches and modifying the role of the generative network from producing an entire image, at once, to creating a sparse representation vector for each image patch.

Generative Adversarial Network

Joint Concept Matching based Learning for Zero-Shot Recognition

no code implementations13 Jun 2019 Wen Tang, Ashkan Panahi, Hamid Krim

Zero-shot learning (ZSL) which aims to recognize unseen object classes by only training on seen object classes, has increasingly been of great interest in Machine Learning, and has registered with some successes.

Object Zero-Shot Learning

Analysis Dictionary Learning: An Efficient and Discriminative Solution

no code implementations7 Mar 2019 Wen Tang, Ashkan Panahi, Hamid Krim, Liyi Dai

Discriminative Dictionary Learning (DL) methods have been widely advocated for image classification problems.

Dictionary Learning General Classification +1

Analysis Dictionary Learning based Classification: Structure for Robustness

1 code implementation13 Jul 2018 Wen Tang, Ashkan Panahi, Hamid Krim, Liyi Dai

A consensus structured analysis dictionary and a global classifier are jointly learned in the distributed approach to safeguard the discriminative power and the efficiency of classification.

Classification Dictionary Learning +1

Structured Analysis Dictionary Learning for Image Classification

1 code implementation2 May 2018 Wen Tang, Ashkan Panahi, Hamid Krim, Liyi Dai

We propose a computationally efficient and high-performance classification algorithm by incorporating class structural information in analysis dictionary learning.

Classification Dictionary Learning +2

Demystifying Deep Learning: A Geometric Approach to Iterative Projections

no code implementations22 Mar 2018 Ashkan Panahi, Hamid Krim, Liyi Dai

Parametric approaches to Learning, such as deep learning (DL), are highly popular in nonlinear regression, in spite of their extremely difficult training with their increasing complexity (e. g. number of layers in DL).

regression

Deep Dictionary Learning: A PARametric NETwork Approach

no code implementations11 Mar 2018 Shahin Mahdizadehaghdam, Ashkan Panahi, Hamid Krim, Liyi Dai

Deep dictionary learning seeks multiple dictionaries at different image scales to capture complementary coherent characteristics.

Classification Dictionary Learning +2

A Universal Analysis of Large-Scale Regularized Least Squares Solutions

no code implementations NeurIPS 2017 Ashkan Panahi, Babak Hassibi

Precise expressions for the asymptotic performance of LASSO have been obtained for a number of different cases, in particular when the elements of the dictionary matrix are sampled independently from a Gaussian distribution.

valid

Clustering by Sum of Norms: Stochastic Incremental Algorithm, Convergence and Cluster Recovery

no code implementations ICML 2017 Ashkan Panahi, Devdatt Dubhashi, Fredrik D. Johansson, Chiranjib Bhattacharyya

Standard clustering methods such as K-means, Gaussian mixture models, and hierarchical clustering are beset by local minima, which are sometimes drastically suboptimal.

Clustering

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