Search Results for author: Fredrik Sandin

Found 16 papers, 5 papers with code

ReLU and Addition-based Gated RNN

no code implementations10 Aug 2023 Rickard Brännvall, Henrik Forsgren, Fredrik Sandin, Marcus Liwicki

It is demonstrated that the novel gating mechanism can capture long-term dependencies for a standard synthetic sequence learning task while significantly reducing computational costs such that execution time is reduced by half on CPU and by one-third under encryption.

Handwritten Text Recognition Privacy Preserving +1

Deep Perceptual Similarity is Adaptable to Ambiguous Contexts

1 code implementation5 Apr 2023 Gustav Grund Pihlgren, Fredrik Sandin, Marcus Liwicki

The concept of image similarity is ambiguous, and images can be similar in one context and not in another.

A Comparison of Temporal Encoders for Neuromorphic Keyword Spotting with Few Neurons

no code implementations24 Jan 2023 Mattias Nilsson, Ton Juny Pina, Lyes Khacef, Foteini Liwicki, Elisabetta Chicca, Fredrik Sandin

With the expansion of AI-powered virtual assistants, there is a need for low-power keyword spotting systems providing a "wake-up" mechanism for subsequent computationally expensive speech recognition.

Binary Classification Keyword Spotting +2

Integration of Neuromorphic AI in Event-Driven Distributed Digitized Systems: Concepts and Research Directions

no code implementations20 Oct 2022 Mattias Nilsson, Olov Schelén, Anders Lindgren, Ulf Bodin, Cristina Paniagua, Jerker Delsing, Fredrik Sandin

Based on this analysis, we propose a microservice-based framework for neuromorphic systems integration, consisting of a neuromorphic-system proxy, which provides virtualization and communication capabilities required in distributed systems of systems, in combination with a declarative programming approach offering engineering-process abstraction.

Identifying and Mitigating Flaws of Deep Perceptual Similarity Metrics

1 code implementation6 Jul 2022 Oskar Sjögren, Gustav Grund Pihlgren, Fredrik Sandin, Marcus Liwicki

This work investigates the most common DPS metric, where deep features are compared by spatial position, along with metrics comparing the averaged and sorted deep features.

Technical Language Supervision for Intelligent Fault Diagnosis in Process Industry

no code implementations11 Dec 2021 Karl Löwenmark, Cees Taal, Stephan Schnabel, Marcus Liwicki, Fredrik Sandin

In the process industry, condition monitoring systems with automated fault diagnosis methods assist human experts and thereby improve maintenance efficiency, process sustainability, and workplace safety.

Contrastive Learning Model Optimization +1

Spatiotemporal Pattern Recognition in Single Mixed-Signal VLSI Neurons with Heterogeneous Dynamic Synapses

no code implementations10 Jun 2021 Mattias Nilsson, Foteini Liwicki, Fredrik Sandin

Mixed-signal neuromorphic processors with brain-like organization and device physics offer an ultra-low-power alternative to the unsustainable developments of conventional deep learning and computing.

Pretraining Image Encoders without Reconstruction via Feature Prediction Loss

1 code implementation16 Mar 2020 Gustav Grund Pihlgren, Fredrik Sandin, Marcus Liwicki

To evaluate this method we perform experiments on three standard publicly available datasets (LunarLander-v2, STL-10, and SVHN) and compare six different procedures for training image encoders (pixel-wise, perceptual similarity, and feature prediction losses; combined with two variations of image and feature encoding/decoding).

Synaptic Integration of Spatiotemporal Features with a Dynamic Neuromorphic Processor

no code implementations12 Feb 2020 Mattias Nilsson, Foteini Liwicki, Fredrik Sandin

Here, we investigate synaptic integration of spatiotemporal spike patterns with multiple dynamic synapses on point-neurons in the DYNAP-SE neuromorphic processor, which offers a complementary resource-efficient, albeit less flexible, approach to feature detection.

Improving Image Autoencoder Embeddings with Perceptual Loss

1 code implementation10 Jan 2020 Gustav Grund Pihlgren, Fredrik Sandin, Marcus Liwicki

Autoencoders are trained to embed images from three different computer vision datasets using perceptual loss based on a pretrained model as well as pixel-wise loss.

Synaptic Delays for Temporal Feature Detection in Dynamic Neuromorphic Processors

no code implementations28 Jun 2019 Fredrik Sandin, Mattias Nilsson

Furthermore, we present a network that mimics the auditory feature detection circuit of crickets and demonstrate how varying synapse weights, input noise and processor temperature affects the circuit.

Dictionary learning approach to monitoring of wind turbine drivetrain bearings

no code implementations4 Feb 2019 Sergio Martin-del-Campo, Fredrik Sandin, Daniel Strömbergsson

In this study, dictionaries are learned from gearbox vibrations in six different turbines, and the dictionaries are subsequently propagated over a few years of monitoring data when faults are known to occur.

Anomaly Detection Dictionary Learning

Dictionary Learning with Equiprobable Matching Pursuit

no code implementations28 Nov 2016 Fredrik Sandin, Sergio Martin-del-Campo

Sparse signal representations based on linear combinations of learned atoms have been used to obtain state-of-the-art results in several practical signal processing applications.

Denoising Dictionary Learning

Towards zero-configuration condition monitoring based on dictionary learning

no code implementations12 Feb 2015 Sergio Martin-del-Campo, Fredrik Sandin

In this paper, we investigate the possibility to automate the condition monitoring process by continuously learning a dictionary of optimized shift-invariant feature vectors using a well-known sparse approximation method.

Dictionary Learning

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