A Novel Framework for Learning Stochastic Representations for Sequence Generation and Recognition

TL;DR

This paper introduces a stochastic RNN model inspired by brain principles that learns probabilistic sequence representations, improving robustness and generalization in sequence generation and recognition tasks.

Contribution

It presents a novel stochastic RNN with parametric biases that incorporates uncertainty modeling, advancing sequence learning in AI and robotics.

Findings

Outperforms deterministic models in sequence generation and recognition

Quantifies and adjusts uncertainty during learning and inference

Creates a continuous latent space for stable motion generation

Abstract

The ability to generate and recognize sequential data is fundamental for autonomous systems operating in dynamic environments. Inspired by the key principles of the brain-predictive coding and the Bayesian brain-we propose a novel stochastic Recurrent Neural Network with Parametric Biases (RNNPB). The proposed model incorporates stochasticity into the latent space using the reparameterization trick used in variational autoencoders. This approach enables the model to learn probabilistic representations of multidimensional sequences, capturing uncertainty and enhancing robustness against overfitting. We tested the proposed model on a robotic motion dataset to assess its performance in generating and recognizing temporal patterns. The experimental results showed that the stochastic RNNPB model outperformed its deterministic counterpart in generating and recognizing motion sequences. The results highlighted the proposed model's capability to quantify and adjust uncertainty during both learning and inference. The stochasticity resulted in a continuous latent space representation, facilitating stable motion generation and enhanced generalization when recognizing novel sequences. Our approach provides a biologically inspired framework for modeling temporal patterns and advances the development of robust and adaptable systems in artificial intelligence and robotics.