Search Results for author: Rafal Bogacz

Found 13 papers, 4 papers with code

Associative Memories in the Feature Space

no code implementations16 Feb 2024 Tommaso Salvatori, Beren Millidge, Yuhang Song, Rafal Bogacz, Thomas Lukasiewicz

This problem can be easily solved by computing \emph{similarities} in an embedding space instead of the pixel space.

Sequential Memory with Temporal Predictive Coding

1 code implementation NeurIPS 2023 Mufeng Tang, Helen Barron, Rafal Bogacz

Forming accurate memory of sequential stimuli is a fundamental function of biological agents.

A Theoretical Framework for Inference and Learning in Predictive Coding Networks

1 code implementation21 Jul 2022 Beren Millidge, Yuhang Song, Tommaso Salvatori, Thomas Lukasiewicz, Rafal Bogacz

In this paper, we provide a comprehensive theoretical analysis of the properties of PCNs trained with prospective configuration.

Continual Learning

Predictive Coding: Towards a Future of Deep Learning beyond Backpropagation?

no code implementations18 Feb 2022 Beren Millidge, Tommaso Salvatori, Yuhang Song, Rafal Bogacz, Thomas Lukasiewicz

The backpropagation of error algorithm used to train deep neural networks has been fundamental to the successes of deep learning.

Learning on Arbitrary Graph Topologies via Predictive Coding

no code implementations31 Jan 2022 Tommaso Salvatori, Luca Pinchetti, Beren Millidge, Yuhang Song, TianYi Bao, Rafal Bogacz, Thomas Lukasiewicz

Training with backpropagation (BP) in standard deep learning consists of two main steps: a forward pass that maps a data point to its prediction, and a backward pass that propagates the error of this prediction back through the network.

Associative Memories via Predictive Coding

no code implementations NeurIPS 2021 Tommaso Salvatori, Yuhang Song, Yujian Hong, Simon Frieder, Lei Sha, Zhenghua Xu, Rafal Bogacz, Thomas Lukasiewicz

We conclude by discussing the possible impact of this work in the neuroscience community, by showing that our model provides a plausible framework to study learning and retrieval of memories in the brain, as it closely mimics the behavior of the hippocampus as a memory index and generative model.

Hippocampus Retrieval

Reverse Differentiation via Predictive Coding

no code implementations8 Mar 2021 Tommaso Salvatori, Yuhang Song, Thomas Lukasiewicz, Rafal Bogacz, Zhenghua Xu

Recent works prove that these methods can approximate BP up to a certain margin on multilayer perceptrons (MLPs), and asymptotically on any other complex model, and that zero-divergence inference learning (Z-IL), a variant of PC, is able to exactly implement BP on MLPs.

Can the Brain Do Backpropagation? --- Exact Implementation of Backpropagation in Predictive Coding Networks

no code implementations NeurIPS 2020 Yuhang Song, Thomas Lukasiewicz, Zhenghua Xu, Rafal Bogacz

However, there are several gaps between BP and learning in biologically plausible neuronal networks of the brain (learning in the brain, or simply BL, for short), in particular, (1) it has been unclear to date, if BP can be implemented exactly via BL, (2) there is a lack of local plasticity in BP, i. e., weight updates require information that is not locally available, while BL utilizes only locally available information, and (3)~there is a lack of autonomy in BP, i. e., some external control over the neural network is required (e. g., switching between prediction and learning stages requires changes to dynamics and synaptic plasticity rules), while BL works fully autonomously.

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