Search Results for author: Andreas Wichert

Found 16 papers, 0 papers with code

Competitive learning to generate sparse representations for associative memory

no code implementations5 Jan 2023 Luis Sacouto, Andreas Wichert

Yet, associative memory can only work with logarithmic sparse representations, which makes it extremely difficult to apply the model to real data.

The smooth output assumption, and why deep networks are better than wide ones

no code implementations25 Nov 2022 Luis Sa-Couto, Jose Miguel Ramos, Andreas Wichert

We call it the output sharpness, and it is based on the fact that, in reality, boundaries between concepts are generally unsharp.

Model Selection

Understanding the double descent curve in Machine Learning

no code implementations18 Nov 2022 Luis Sa-Couto, Jose Miguel Ramos, Miguel Almeida, Andreas Wichert

The theory of bias-variance used to serve as a guide for model selection when applying Machine Learning algorithms.

Model Selection

Multi-level Data Representation For Training Deep Helmholtz Machines

no code implementations26 Oct 2022 Jose Miguel Ramos, Luis Sa-Couto, Andreas Wichert

A vast majority of the current research in the field of Machine Learning is done using algorithms with strong arguments pointing to their biological implausibility such as Backpropagation, deviating the field's focus from understanding its original organic inspiration to a compulsive search for optimal performance.

valid

Can a Hebbian-like learning rule be avoiding the curse of dimensionality in sparse distributed data?

no code implementations20 Jul 2022 Maria Osório, Luís Sa-Couto, Andreas Wichert

In tasks for which there is a vast amount of labeled data, Deep Networks seem to solve this issue with many layers and a non-Hebbian backpropagation algorithm.

Classification and Generation of real-world data with an Associative Memory Model

no code implementations11 Jul 2022 Rodrigo Simas, Luis Sa-Couto, Andreas Wichert

Using our recently proposed sparse coding prescription for visual patterns, this model can store and retrieve an impressive amount of real-world data in a fault-tolerant manner.

Retrieval

Using brain inspired principles to unsupervisedly learn good representations for visual pattern recognition

no code implementations30 Apr 2021 Luis Sa-Couto, Andreas Wichert

For these reasons it is still a key research question to look into computational principles in the brain that can help guide models to unsupervisedly learn good representations which can then be used to perform tasks like classification.

An Investigation of Interpretability Techniques for Deep Learning in Predictive Process Analytics

no code implementations21 Feb 2020 Catarina Moreira, Renuka Sindhgatta, Chun Ouyang, Peter Bruza, Andreas Wichert

We see certain distinct features used for predictions that provide useful insights about the type of cancer, along with features that do not generalize well.

Decision Making Interpretability Techniques for Deep Learning

Towards a Quantum-Like Cognitive Architecture for Decision-Making

no code implementations11 May 2019 Catarina Moreira, Lauren Fell, Shahram Dehdashti, Peter Bruza, Andreas Wichert

We propose an alternative and unifying framework for decision-making that, by using quantum mechanics, provides more generalised cognitive and decision models with the ability to represent more information than classical models.

Decision Making

Introducing Quantum-Like Influence Diagrams for Violations of the Sure Thing Principle

no code implementations16 Jul 2018 Catarina Moreira, Andreas Wichert

The general idea is to take advantage of the quantum interference terms produced in the quantum-like Bayesian Network to influence the probabilities used to compute the expected utility of some action.

Decision Making

The Relation Between Acausality and Interference in Quantum-Like Bayesian Networks

no code implementations26 Aug 2015 Catarina Moreira, Andreas Wichert

We analyse a quantum-like Bayesian Network that puts together cause/effect relationships and semantic similarities between events.

Relation

On Projection Based Operators in Lp space for Exact Similarity Search

no code implementations12 Feb 2015 Andreas Wichert, Catarina Moreira

We investigate exact indexing for high dimensional Lp norms based on the 1-Lipschitz property and projection operators.

A Quantum Production Model

no code implementations6 Feb 2015 Luís Tarrataca, Andreas Wichert

The production system is a theoretical model of computation relevant to the artificial intelligence field allowing for problem solving procedures such as hierarchical tree search.

Interference Effects in Quantum Belief Networks

no code implementations30 Sep 2014 Catarina Moreira, Andreas Wichert

This means that probabilistic graphical models based on classical probability theory are too limited to fully simulate and explain various aspects of human decision making.

Decision Making

Finding Academic Experts on a MultiSensor Approach using Shannon's Entropy

no code implementations12 Jun 2013 Catarina Moreira, Andreas Wichert

To deal with these conflicts, we applied the Dempster-Shafer theory of evidence combined with Shannon's Entropy formula to fuse this information and come up with a more accurate and reliable final ranking list.

Information Retrieval Retrieval

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