18 results on '"Andén, Joakim"'
Search Results
2. Time–frequency scattering accurately models auditory similarities between instrumental playing techniques
- Author
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Lostanlen, Vincent, El-Hajj, Christian, Rossignol, Mathias, Lafay, Grégoire, Andén, Joakim, and Lagrange, Mathieu
- Published
- 2021
- Full Text
- View/download PDF
3. Fourier at the heart of computer music: From harmonic sounds to texture
- Author
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Lostanlen, Vincent, Andén, Joakim, and Lagrange, Mathieu
- Published
- 2019
- Full Text
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4. Sound absorption estimation of finite porous samples with deep residual learninga).
- Author
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Zea, Elias, Brandão, Eric, Nolan, Mélanie, Cuenca, Jacques, Andén, Joakim, and Svensson, U. Peter
- Abstract
This work proposes a method to predict the sound absorption coefficient of finite porous absorbers using a residual neural network and a single-layer microphone array. The goal is to mitigate the discrepancies between predicted and measured data due to the finite-size effect for a wide range of rectangular absorbers with varying dimensions and flow resistivity and for various source-receiver locations. Data for training, validation, and testing are generated with a boundary element model consisting of a baffled porous layer on a rigid backing using the Delany–Bazley–Miki model. In effect, the network learns relevant features from the array pressure amplitude to predict the sound absorption as if the porous material were infinite. The method's performance is quantified with the error between the predicted and theoretical sound absorption coefficients and compared with the two-microphone method. For array distances close to the porous sample, the proposed method performs at least as well as the two-microphone method and significantly better than it for frequencies below 400 Hz and small absorber sizes (e.g., 20 × 20 cm
2 ). The significance of the study lies in the possibility of measuring sound absorption on-site in the presence of strong edge diffraction. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
5. Relevance-based quantization of scattering features for unsupervised mining of environmental audio
- Author
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Lostanlen, Vincent, Lafay, Grégoire, Andén, Joakim, and Lagrange, Mathieu
- Published
- 2018
- Full Text
- View/download PDF
6. Learning the finite size effect for in-situ absorption measurement
- Author
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Zea, Elias, Brandão, Eric, Nolan, Mélanie, Andén, Joakim, Cuenca, Jacques, and Svensson, U. Peter
- Subjects
Datavetenskap (datalogi) ,Fluid Mechanics and Acoustics ,Computer Sciences ,convolutional neural networks ,Delany– Bazley–Miki model ,in-situ measurement ,Strömningsmekanik och akustik ,Sannolikhetsteori och statistik ,Sound absorption ,Probability Theory and Statistics ,finite size effect - Abstract
In this paper we propose the use of neural networks to predict the sound absorption coefficient spectra of finite porous samples with microphone arrays. The main goal is to train a model that can effectively mitigate the errors caused by the finite size effect. A convolutional neural network architecture is used to map the array data to the absorption coefficient at five frequencies. The training, validation and test data are numerically produced with a boundary element method; modelling a baffled, locally reacting porous absorber on a rigid backing with a Delany–Bazley–Miki model, for varying sample size, thickness, flow resistivity, incidence angle and frequency. The strength of using machine learning in this context is that no hypotheses are made about the sound field or the absorber, as the networks learn the necessary relationships from the data. We show that the network approximates well the absorption coefficient, as if the sample was infinite, in a wide range of cases. QC 20211103
- Published
- 2021
7. Kymatio: Scattering Transforms in Python
- Author
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Andreux, Mathieu, Angles, Tomás, Exarchakis, Georgios, Leonarduzzi, Roberto, Rochette, Gaspar, Thiry, Louis, Zarka, John, Mallat, Stéphane, andén, Joakim, Belilovsky, Eugene, Bruna, Joan, Lostanlen, Vincent, Chaudhary, Muawiz, Hirn, Matthew J., Oyallon, Edouard, Zhang, Sixin, Cella, Carmine, Eickenberg, Michael, Owkin France, Département d'informatique - ENS Paris (DI-ENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Flatiron Institute, Simons Foundation, Chaire Sciences des données, Collège de France (CdF (institution)), Department of Mathematics [Sweden] (KTH), Stockholm University, Montreal Institute for Learning Algorithms [Montréal] (MILA), Centre de Recherches Mathématiques [Montréal] (CRM), Université de Montréal (UdeM)-Université de Montréal (UdeM), New York University [New York] (NYU), NYU System (NYU), Michigan State University [Traverse City], Michigan State University System, Machine Learning and Information Access (MLIA), LIP6, Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Peking University [Beijing], Center for New Music and Audio Technologies (CNMAT), Oyallon, Edouard, Département d'informatique de l'École normale supérieure (DI-ENS), École normale supérieure - Paris (ENS-PSL), and Collège de France - Chaire Sciences des données
- Subjects
FOS: Computer and information sciences ,Computer Science - Machine Learning ,Sound (cs.SD) ,Computer Vision and Pattern Recognition (cs.CV) ,Computer Science - Computer Vision and Pattern Recognition ,Machine Learning (stat.ML) ,Computer Science - Sound ,Machine Learning (cs.LG) ,[INFO.INFO-MS] Computer Science [cs]/Mathematical Software [cs.MS] ,Statistics - Machine Learning ,Audio and Speech Processing (eess.AS) ,FOS: Electrical engineering, electronic engineering, information engineering ,Electrical Engineering and Systems Science - Audio and Speech Processing ,[INFO.INFO-MS]Computer Science [cs]/Mathematical Software [cs.MS] - Abstract
International audience; The wavelet scattering transform is an invariant signal representation suitable for many signal processing and machine learning applications. We present the Kymatio software package, an easy-to-use, high-performance Python implementation of the scattering transform in 1D, 2D, and 3D that is compatible with modern deep learning frameworks. All transforms may be executed on a GPU (in addition to CPU), offering a considerable speed up over CPU implementations. The package also has a small memory footprint, resulting inefficient memory usage. The source code, documentation, and examples are available undera BSD license at https://www.kymat.io/
- Published
- 2020
8. Multitaper Estimation on Arbitrary Domains.
- Author
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Andén, Joakim and Romero, José Luis
- Subjects
SYMMETRIC domains ,SPECTRAL energy distribution ,VECTOR spaces ,MICROSCOPY ,SAMPLE size (Statistics) - Abstract
Multitaper estimators have enjoyed significant success in estimating spectral densities from finite samples using as tapers Slepian functions defined on the acquisition domain. Unfortunately, the numerical calculation of these Slepian tapers is only tractable for certain symmetric domains, such as rectangles or disks. In addition, no performance bounds are currently available for the mean squared error of the spectral density estimate. This situation is inadequate for applications such as cryo-electron microscopy, where noise models must be estimated from irregular domains with small sample sizes. We show that the multitaper estimator only depends on the linear space spanned by the tapers. As a result, Slepian tapers may be replaced by proxy tapers spanning the same subspace (validating the common practice of using partially converged solutions to the Slepian eigenproblem as tapers). These proxies may consequently be calculated using standard numerical algorithms for block diagonalization. We also prove a set of performance bounds for multitaper estimators on arbitrary domains. The method is demonstrated on synthetic and experimental datasets from cryoelectron microscopy, where it reduces the mean squared error by a factor of two or more compared to traditional methods. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
9. APPLE picker: Automatic particle picking, a low-effort cryo-EM framework.
- Author
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Heimowitz, Ayelet, Andén, Joakim, and Singer, Amit
- Subjects
- *
PARTICLE detectors , *ELECTRON microscopy , *SUPPORT vector machines , *MICROGRAPHICS , *CROSS correlation , *BETA-galactosidase - Abstract
Abstract Particle picking is a crucial first step in the computational pipeline of single-particle cryo-electron microscopy (cryo-EM). Selecting particles from the micrographs is difficult especially for small particles with low contrast. As high-resolution reconstruction typically requires hundreds of thousands of particles, manually picking that many particles is often too time-consuming. While template-based particle picking is currently a popular approach, it may suffer from introducing manual bias into the selection process. In addition, this approach is still somewhat time-consuming. This paper presents the APPLE (A utomatic P article P icking with L ow user E ffort) picker, a simple and novel approach for fast, accurate, and template-free particle picking. This approach is evaluated on publicly available datasets containing micrographs of β -galactosidase, T20S proteasome, 70S ribosome and keyhole limpet hemocyanin projections. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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10. Structural Variability from Noisy Tomographic Projections.
- Author
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Andén, Joakim and Singer, Amit
- Subjects
CRYOELECTRONICS ,TOMOGRAPHY ,THREE-dimensional imaging ,ELECTRIC potential ,COVARIANCE matrices ,INVERSE problems - Abstract
In cryo-electron microscopy, the three-dimensional (3D) electric potentials of an ensemble of molecules are projected along arbitrary viewing directions to yield noisy two-dimensional images. The volume maps representing these potentials typically exhibit a great deal of structural variability, which is described by their 3D covariance matrix. Typically, this covariance matrix is approximately low rank and can be used to cluster the volumes or estimate the intrinsic geometry of the conformation space. We formulate the estimation of this covariance matrix as a linear inverse problem, yielding a consistent least-squares estimator. For n images of size N-by-N pixels, we propose an algorithm for calculating this covariance estimator with computational complexity O(nN
4 + p √κN6 logN), where the condition number κ is empirically in the range 10{200. Its efficiency relies on the observation that the normal equations are equivalent to a deconvolution problem in six dimensions. This is then solved by the conjugate gradient method with an appropriate circulant preconditioner. The result is the first computationally efficient algorithm for consistent estimation of the 3D covariance from noisy projections. It also compares favorably in runtime with respect to previously proposed nonconsistent estimators. Motivated by the recent success of eigenvalue shrinkage procedures for high-dimensional covariance matrix estimation, we incorporate a shrinkage procedure that improves accuracy at lower signal-to-noise ratios. We evaluate our methods on simulated datasets and achieve classification results comparable to state-of-the-art methods in shorter running time. We also present results on clustering volumes in an experimental dataset, illustrating the power of the proposed algorithm for practical determination of structural variability. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
11. Synthesizing developmental trajectories.
- Author
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Villoutreix, Paul, Andén, Joakim, Lim, Bomyi, Lu, Hang, Kevrekidis, Ioannis G., Singer, Amit, and Shvartsman, Stanislav Y.
- Subjects
- *
GENE expression , *DYNAMICS , *DROSOPHILA , *PHOSPHORYLATION , *MORPHOGENESIS , *MOLECULAR genetics - Abstract
Dynamical processes in biology are studied using an ever-increasing number of techniques, each of which brings out unique features of the system. One of the current challenges is to develop systematic approaches for fusing heterogeneous datasets into an integrated view of multivariable dynamics. We demonstrate that heterogeneous data fusion can be successfully implemented within a semi-supervised learning framework that exploits the intrinsic geometry of high-dimensional datasets. We illustrate our approach using a dataset from studies of pattern formation in Drosophila. The result is a continuous trajectory that reveals the joint dynamics of gene expression, subcellular protein localization, protein phosphorylation, and tissue morphogenesis. Our approach can be readily adapted to other imaging modalities and forms a starting point for further steps of data analytics and modeling of biological dynamics. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
12. Arrhythmia classification of 12-lead and reduced-lead electrocardiograms via recurrent networks, scattering, and phase harmonic correlation.
- Author
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Warrick PA, Lostanlen V, Eickenberg M, Nabhan Homsi M, Campoy Rodríguez A, and Andén J
- Subjects
- Algorithms, Arrhythmias, Cardiac diagnosis, Heart Rate, Humans, Electrocardiography methods, Neural Networks, Computer
- Abstract
We describe an automatic classifier of arrhythmias based on 12-lead and reduced-lead electrocardiograms. Our classifier comprises four modules: scattering transform (ST), phase harmonic correlation (PHC), depthwise separable convolutions (DSC), and a long short-term memory (LSTM) network. It is trained on PhysioNet/Computing in Cardiology Challenge 2021 data. The ST captures short-term temporal ECG modulations while the PHC characterizes the phase dependence of coherent ECG components. Both reduce the sampling rate to a few samples per typical heart beat. We pass the output of the ST and PHC to a depthwise-separable convolution layer (DSC) which combines lead responses separately for each ST or PHC coefficient and then combines resulting values across all coefficients. At a deeper level, two LSTM layers integrate local variations of the input over long time scales. We train in an end-to-end fashion as a multilabel classification problem with a normal and 25 arrhythmia classes. Lastly, we use canonical correlation analysis (CCA) for transfer learning from 12-lead ST and PHC representations to reduced-lead ones. After local cross-validation on the public data from the challenge, our team 'BitScattered' achieved the following results: 0.682 ± 0.0095 for 12-lead; 0.666 ± 0.0257 for 6-lead; 0.674 ± 0.0185 for 4-lead; 0.661 ± 0.0098 for 3-lead; and 0.662 ± 0.0151 for 2-lead., (© 2022 Institute of Physics and Engineering in Medicine.)
- Published
- 2022
- Full Text
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13. Hyper-Molecules: on the Representation and Recovery of Dynamical Structures for Applications in Flexible Macro-Molecules in Cryo-EM.
- Author
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Lederman RR, Andén J, and Singer A
- Abstract
Cryo-electron microscopy (cryo-EM), the subject of the 2017 Nobel Prize in Chemistry, is a technology for obtaining 3-D reconstructions of macromolecules from many noisy 2-D projections of instances of these macromolecules, whose orientations and positions are unknown. These molecules are not rigid objects, but flexible objects involved in dynamical processes. The different conformations are exhibited by different instances of the macromolecule observed in a cryo-EM experiment, each of which is recorded as a particle image. The range of conformations and the conformation of each particle are not known a priori; one of the great promises of cryo-EM is to map this conformation space. Remarkable progress has been made in reconstructing rigid molecules based on homogeneous samples of molecules in spite of the unknown orientation of each particle image and significant progress has been made in recovering a few distinct states from mixtures of rather distinct conformations, but more complex heterogeneous samples remain a major challenge. We introduce the "hyper-molecule" theoretical framework for modeling structures across different states of heterogeneous molecules, including continuums of states. The key idea behind this framework is representing heterogeneous macromolecules as high-dimensional objects, with the additional dimensions representing the conformation space. This idea is then refined to model properties such as localized heterogeneity. In addition, we introduce an algorithmic framework for reconstructing such heterogeneous objects from experimental data using a Bayesian formulation of the problem and Markov chain Monte Carlo (MCMC) algorithms to address the computational challenges in recovering these high dimensional hyper-molecules. We demonstrate these ideas in a preliminary prototype implementation, applied to synthetic data.
- Published
- 2020
- Full Text
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14. Cryo-EM reconstruction of continuous heterogeneity by Laplacian spectral volumes.
- Author
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Moscovich A, Halevi A, Andén J, and Singer A
- Abstract
Single-particle electron cryomicroscopy is an essential tool for high-resolution 3D reconstruction of proteins and other biological macromolecules. An important challenge in cryo-EM is the reconstruction of non-rigid molecules with parts that move and deform. Traditional reconstruction methods fail in these cases, resulting in smeared reconstructions of the moving parts. This poses a major obstacle for structural biologists, who need high-resolution reconstructions of entire macromolecules, moving parts included. To address this challenge, we present a new method for the reconstruction of macromolecules exhibiting continuous heterogeneity. The proposed method uses projection images from multiple viewing directions to construct a graph Laplacian through which the manifold of three-dimensional conformations is analyzed. The 3D molecular structures are then expanded in a basis of Laplacian eigenvectors, using a novel generalized tomographic reconstruction algorithm to compute the expansion coefficients. These coefficients, which we name spectral volumes , provide a high-resolution visualization of the molecular dynamics. We provide a theoretical analysis and evaluate the method empirically on several simulated data sets.
- Published
- 2020
- Full Text
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15. Factor Analysis for Spectral Estimation.
- Author
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Andén J and Singer A
- Abstract
Power spectrum estimation is an important tool in many applications, such as the whitening of noise. The popular multitaper method enjoys significant success, but fails for short signals with few samples. We propose a statistical model where a signal is given by a random linear combination of fixed, yet unknown, stochastic sources. Given multiple such signals, we estimate the subspace spanned by the power spectra of these fixed sources. Projecting individual power spectrum estimates onto this subspace increases estimation accuracy. We provide accuracy guarantees for this method and demonstrate it on simulated and experimental data from cryo-electron microscopy.
- Published
- 2017
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16. COVARIANCE ESTIMATION USING CONJUGATE GRADIENT FOR 3D CLASSIFICATION IN CRYO-EM.
- Author
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Andén J, Katsevich E, and Singer A
- Abstract
Classifying structural variability in noisy projections of biological macromolecules is a central problem in Cryo-EM. In this work, we build on a previous method for estimating the covariance matrix of the three-dimensional structure present in the molecules being imaged. Our proposed method allows for incorporation of contrast transfer function and non-uniform distribution of viewing angles, making it more suitable for real-world data. We evaluate its performance on a synthetic dataset and an experimental dataset obtained by imaging a 70S ribosome complex.
- Published
- 2015
- Full Text
- View/download PDF
17. Scattering transform for intrapartum fetal heart rate variability fractal analysis: a case-control study.
- Author
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Chudáček V, Andén J, Mallat S, Abry P, and Doret M
- Subjects
- Apgar Score, Case-Control Studies, Female, Fractals, Humans, Nonlinear Dynamics, Pregnancy, Pregnancy Outcome, Cardiotocography methods, Heart Rate, Fetal physiology, Signal Processing, Computer-Assisted
- Abstract
Intrapartum fetal heart rate monitoring, aiming at early acidosis detection, constitutes an important public health stake. Scattering transform is proposed here as a new tool to analyze intrapartum fetal heart rate (FHR) variability. It consists of a nonlinear extension of the underlying wavelet transform, that thus preserves its multiscale nature. Applied to an FHR signal database constructed in a French academic hospital, the scattering transform is shown to permit to efficiently measure scaling exponents characterizing the fractal properties of intrapartum FHR temporal dynamics, that relate not only to the sole covariance (correlation scaling exponent), but also to the full dependence structure of data (intermittency scaling exponent). Such exponents are found to satisfactorily discriminate temporal dynamics of healthy subjects (from that of nonhealthy ones) and to emphasize the role of the highest frequencies (around and above 1 Hz) in intrapartum FHR variability. This permits us to achieve satisfactory classification performance that improves on those obtained from the analysis of International Federation of Gynecology and Obstetrics (FIGO) criteria, notably by classifying as healthy a number of subjects that were incorrectly classified as nonhealthy by classical clinically used FIGO criteria. Combined to obstetrician annotations, these scaling exponents enable us to sketch a typology of these FIGO-false positive subjects. Also, they permit us to monitor the evolution along time of the intrapartum health status of the fetuses and to estimate an optimal detection time-frame.
- Published
- 2014
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18. Scattering transform for intrapartum fetal heart rate characterization and acidosis detection.
- Author
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Chudáček V, Andén J, Mallat S, Abry P, and Doret M
- Subjects
- Adult, Databases, Factual, Electrodes, False Positive Reactions, Female, Fetal Monitoring methods, Humans, Linear Models, Multivariate Analysis, Normal Distribution, Pregnancy, Reproducibility of Results, Signal Processing, Computer-Assisted, Time Factors, Wavelet Analysis, Acidosis diagnosis, Fetal Monitoring instrumentation, Heart Rate, Fetal
- Abstract
Early acidosis detection and asphyxia prediction in intrapartum fetal heart rate is of major concern. This contribution aims at assessing the potential of the Scattering Transform to characterize intrapartum fetal heart rate. Elaborating on discrete wavelet transform, the Scattering Transform performs a non linear and multiscale analysis, thus probing not only the covariance structure of data but also the full dependence structure. Applied to a real database constructed by a French public academic hospital, the Scattering Transform is shown to catch relevant features of intrapartum fetal heart rate time dynamics and to have a satisfactory ability to discriminate Normal subjects from Abnormal.
- Published
- 2013
- Full Text
- View/download PDF
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