Search Results for author: Qinghai Guo

Found 18 papers, 6 papers with code

When in Doubt, Think Slow: Iterative Reasoning with Latent Imagination

no code implementations23 Feb 2024 Martin Benfeghoul, Umais Zahid, Qinghai Guo, Zafeirios Fountas

In an unfamiliar setting, a model-based reinforcement learning agent can be limited by the accuracy of its world model.

Model-based Reinforcement Learning

Sample as You Infer: Predictive Coding With Langevin Dynamics

no code implementations22 Nov 2023 Umais Zahid, Qinghai Guo, Zafeirios Fountas

We present a novel algorithm for parameter learning in generic deep generative models that builds upon the predictive coding (PC) framework of computational neuroscience.

Automotive Object Detection via Learning Sparse Events by Spiking Neurons

no code implementations24 Jul 2023 Hu Zhang, Yanchen Li, Luziwei Leng, Kaiwei Che, Qian Liu, Qinghai Guo, Jianxing Liao, Ran Cheng

Traditional object detection techniques that utilize Artificial Neural Networks (ANNs) face challenges due to the sparse and asynchronous nature of the events these sensors capture.

Event-based vision object-detection +1

Cross-Inferential Networks for Source-free Unsupervised Domain Adaptation

no code implementations29 Jun 2023 Yushun Tang, Qinghai Guo, Zhihai He

Our main idea is that, when we adapt the network model to predict the sample labels from encoded features, we use these prediction results to construct new training samples with derived labels to learn a new examiner network that performs a different but compatible task in the target domain.

Image Classification Unsupervised Domain Adaptation

Accurate and Efficient Event-based Semantic Segmentation Using Adaptive Spiking Encoder-Decoder Network

no code implementations24 Apr 2023 Rui Zhang, Luziwei Leng, Kaiwei Che, Hu Zhang, Jie Cheng, Qinghai Guo, Jiangxing Liao, Ran Cheng

Leveraging the low-power, event-driven computation and the inherent temporal dynamics, spiking neural networks (SNNs) are potentially ideal solutions for processing dynamic and asynchronous signals from event-based sensors.

Event-based vision Semantic Segmentation

Predictive Coding as a Neuromorphic Alternative to Backpropagation: A Critical Evaluation

no code implementations5 Apr 2023 Umais Zahid, Qinghai Guo, Zafeirios Fountas

Backpropagation has rapidly become the workhorse credit assignment algorithm for modern deep learning methods.

Curvature-Sensitive Predictive Coding with Approximate Laplace Monte Carlo

no code implementations9 Mar 2023 Umais Zahid, Qinghai Guo, Karl Friston, Zafeirios Fountas

In part, this has been due to the poor performance of models trained with PC when evaluated by both sample quality and marginal likelihood.

Neuro-Modulated Hebbian Learning for Fully Test-Time Adaptation

no code implementations CVPR 2023 Yushun Tang, Ce Zhang, Heng Xu, Shuoshuo Chen, Jie Cheng, Luziwei Leng, Qinghai Guo, Zhihai He

We observe that the performance of this feed-forward Hebbian learning for fully test-time adaptation can be significantly improved by incorporating a feedback neuro-modulation layer.

Test-time Adaptation

Long-horizon video prediction using a dynamic latent hierarchy

no code implementations29 Dec 2022 Alexey Zakharov, Qinghai Guo, Zafeirios Fountas

The task of video prediction and generation is known to be notoriously difficult, with the research in this area largely limited to short-term predictions.

Representation Learning Video Prediction

Self-Supervised Learning Through Efference Copies

1 code implementation17 Oct 2022 Franz Scherr, Qinghai Guo, Timoleon Moraitis

Specifically, the brain also transforms the environment through efference, i. e. motor commands, however it sends to itself an EC of the full commands, i. e. more than a mere SSL sign.

Image Classification object-detection +2

Hebbian Deep Learning Without Feedback

1 code implementation23 Sep 2022 Adrien Journé, Hector Garcia Rodriguez, Qinghai Guo, Timoleon Moraitis

Recent approximations to backpropagation (BP) have mitigated many of BP's computational inefficiencies and incompatibilities with biology, but important limitations still remain.

Modelling non-reinforced preferences using selective attention

no code implementations25 Jul 2022 Noor Sajid, Panagiotis Tigas, Zafeirios Fountas, Qinghai Guo, Alexey Zakharov, Lancelot Da Costa

These memories are selectively attended to, using attention and gating blocks, to update agent's preferences.

OpenAI Gym

Short-Term Plasticity Neurons Learning to Learn and Forget

1 code implementation28 Jun 2022 Hector Garcia Rodriguez, Qinghai Guo, Timoleon Moraitis

Its key mechanism is that synapses have a state, propagated through time by a self-recurrent connection-within-the-synapse.

Reinforcement Learning (RL) Retrieval

Discrete Time Convolution for Fast Event-Based Stereo

1 code implementation CVPR 2022 Kaixuan Zhang, Kaiwei Che, JianGuo Zhang, Jie Cheng, Ziyang Zhang, Qinghai Guo, Luziwei Leng

Inspired by continuous dynamics of biological neuron models, we propose a novel encoding method for sparse events - continuous time convolution (CTC) - which learns to model the spatial feature of the data with intrinsic dynamics.

Depth Estimation Stereo Matching

Spike-inspired Rank Coding for Fast and Accurate Recurrent Neural Networks

1 code implementation ICLR 2022 Alan Jeffares, Qinghai Guo, Pontus Stenetorp, Timoleon Moraitis

We demonstrate these in two toy problems of sequence classification, and in a temporally-encoded MNIST dataset where our RC model achieves 99. 19% accuracy after the first input time-step, outperforming the state of the art in temporal coding with SNNs, as well as in spoken-word classification of Google Speech Commands, outperforming non-RC-trained early inference with LSTMs.

SoftHebb: Bayesian Inference in Unsupervised Hebbian Soft Winner-Take-All Networks

1 code implementation12 Jul 2021 Timoleon Moraitis, Dmitry Toichkin, Adrien Journé, Yansong Chua, Qinghai Guo

All in all, Hebbian efficiency, theoretical underpinning, cross-entropy-minimization, and surprising empirical advantages, suggest that SoftHebb may inspire highly neuromorphic and radically different, but practical and advantageous learning algorithms and hardware accelerators.

Bayesian Inference

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